Netherlands
Sou
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www.sciencedirect.com Abstract
This study evaluates how BRICS financial cooperation—specifically through the New Development Bank (NDB) and Contingent Reserve Arrangement (CRA)—impacts exchange rate stability. Utilizing a multi-period difference-in-differences (DID) framework on 99 countries from 2004 to 2024, we find that institutionalized cooperation significantly reduces realized exchange rate volatility. This stabilizing effect operates by optimizing domestic credit structures to mitigate “original sin” and attracting resilient foreign direct investment (FDI). Furthermore, the policy's efficacy is amplified by robust foreign reserves and political stability, yet attenuated by high domestic inflation. These results underscore the importance of non-Western financial safety nets in enhancing the macroeconomic resilience of emerging markets against global financial cycle shocks.
1. Introduction
In the contemporary global financial landscape, emerging market economies (EMEs) grapple with a fundamental “Dilemma” rather than the classic “Trilemma.” The dominance of the global financial cycle implies that domestic monetary conditions in EMEs are disproportionately sensitive to U.S. monetary policy shifts, regardless of their exchange rate regimes (
Miranda-Agrippino and Rey, 2020). This dependence on a dollar-centric architecture exposes member states to heightened exchange rate fluctuations and speculative capital outflows (
McLeay & Tenreyro, 2025). In response, the BRICS nations (Brazil, Russia, India, China, and South Africa) have accelerated a “de-dollarization” agenda, establishing institutional buffers such as the New Development Bank (NDB) and the Contingent Reserve Arrangement (CRA) to foster a more resilient financial framework.
Existing research on the macroeconomic stability of emerging market economies (EMEs) has primarily developed along three distinct trajectories. First, a substantial body of work explores the systemic vulnerabilities imposed by the “Global Financial Cycle” and the pervasive hegemony of the US dollar (
Obstfeld & Zhou, 2022). These studies, exemplified by the “Dilemma, not Trilemma” hypothesis, argue that U.S. monetary policy shifts are the primary drivers of cross-border capital flows and exchange rate fluctuations in EMEs, effectively decoupling domestic monetary conditions from local fundamentals (
Luo et al., 2025). Second, extensive research has addressed the micro-structural vulnerabilities of emerging markets, particularly the phenomenon of “Original Sin"—the inability of these nations to borrow abroad in their own currencies (
Onen et al., 2025). Scholars in this vein emphasize how currency mismatches on national balance sheets trigger valuation effects, where currency depreciation exacerbates debt burdens and further destabilizes the exchange rate (
Allen & Juvenal, 2025). Third, while a nascent literature has begun to examine South-South cooperation, it remains heavily bifurcated: focusing either on the trade-related dimensions of de-dollarization (
Quintana, 2025a) or offering qualitative assessments of the institutional mandates of the New Development Bank (NDB) (
Collins, 2025). Consequently, empirical evidence quantifying the direct macroeconomic stabilizing potential of collective institutional frameworks like the NDB and the Contingent Reserve Arrangement (CRA) remains conspicuously absent.
Against this backdrop, this paper addresses a pivotal empirical void by providing a systematic evaluation of whether and how institutionalized financial cooperation within the BRICS framework stabilizes member states’ currencies. Given the intensifying fragmentation of the international monetary system, quantifying the efficacy of non-Western financial safety nets is of profound importance for emerging markets seeking to mitigate the inherent pro-cyclicality of the dollar cycle. We investigate the effect of BRICS financial cooperation—proxied by the operationalization of the NDB and CRA—on realized exchange rate volatility. Specifically, we explore whether the promotion of local currency settlements and the provision of liquidity support successfully mitigate the spillover effects of the global financial cycle.
By identifying the underlying transmission channels and domestic boundary conditions, this study offers critical insights into the design of collective institutional arrangements aimed at enhancing macroeconomic resilience. The importance of this research is further underscored by the recent 2024 expansion of the BRICS, which presents a unique natural experiment to test the scalability of de-dollarization initiatives in an increasingly multipolar financial world. In doing so, we go beyond qualitative assertions to provide a rigorous, evidence-based assessment of how South-South cooperation functions as an anchor for exchange rate stability.
2. Theoretical analysis and research hypotheses
2.1. The multidimensionality of de-dollarization: transactional, financial, and institutional perspectives
In the contemporary global financial landscape, the concept of “de-dollarization” has evolved from a mere political aspiration into a multifaceted macroeconomic strategy aimed at mitigating the systemic vulnerabilities imposed by the hegemony of the US dollar (
Gerding & Hartley, 2024;
Pforr et al., 2025;
Quintana, 2025). To rigorously evaluate its impact on exchange rate stability, it is essential to define de-dollarization across three distinct but interrelated dimensions: the transactional level, the financial level, and the institutional level. While the existing literature often conflates these aspects, this study delineates them to clarify the specific transmission pathways through which BRICS cooperation operates.
At the transactional level, de-dollarization refers to the reduction of the US dollar's role as a medium of exchange and a unit of account in international trade. This is primarily manifested through the promotion of local currency settlements (LCS) and the establishment of bilateral currency swap lines among member states. By bypassing the dollar-centric clearing systems, countries can reduce transaction costs and mitigate the direct exchange rate risks associated with intermediary currency conversions. Although this study acknowledges the trade-related dimensions of de-dollarization as a foundational component of South-South cooperation, the transactional level serves more as a facilitator rather than the primary driver of medium-term exchange rate stability. Instead, this paper posits that the stabilizing potential of de-dollarization is most effectively realized when it moves beyond simple trade settlement into the deeper structural domains of finance and institutional governance.
Consequently, this research focuses predominantly on the financial and institutional levels of de-dollarization. At the financial level, the focus shifts to the optimization of national balance sheets and the mitigation of “original sin"—the persistent inability of emerging market economies (EMEs) to borrow abroad in their domestic currencies. Financial de-dollarization involves deepening local currency bond markets and increasing the proportion of domestic credit within the total debt portfolio. This structural shift is critical because it reduces the “valuation effect,” where fluctuations in the value of the US dollar trigger automatic changes in the real value of external debt, often leading to pro-cyclical volatility and financial distress. At the institutional level, de-dollarization is embodied by the creation of non-Western financial safety nets, such as the New Development Bank (NDB) and the Contingent Reserve Arrangement (CRA). These institutions provide collective buffers and liquidity supports that decouple member states from the inherent pro-cyclicality of the global financial cycle, thereby fostering a more resilient financial framework that is less dependent on the discretionary policy shifts of the Federal Reserve.
2.2. Financial cooperation and exchange rate volatility
The theoretical foundation of BRICS financial cooperation is rooted in the strategic neutralization of the “Global Financial Cycle,” a phenomenon that systematically erodes the monetary autonomy of emerging market economies (EMEs) (
Miranda-Agrippino & Rey, 2020a). According to the “Dilemma, not Trilemma” view, the US dollar's (USD) role as the global numeraire subjects EMEs to the Federal Reserve's policy shocks, creating a spillover mechanism where domestic economic fundamentals are often overwhelmed by exogenous liquidity shifts (
Lastauskas and Nguyen, 2024). This structural vulnerability arises because the USD-centric financial architecture forces EMEs to act as “price takers” in global capital markets, where any tightening of US monetary policy triggers a mechanical reversal of capital flows and an expansion of risk spreads (
Lastauskas and Nguyen, 2024;
Faia et al., 2025). By developing an alternative financial infrastructure—specifically through the New Development Bank (NDB) and the promotion of local currency settlement—BRICS nations are not merely seeking political alignment but are engaging in a structural decoupling (
Hofman & Srinivas, 2024). This process formally reduces the “beta” of member currencies by diversifying the denomination of trade and debt, thereby weakening the sensitivity of domestic exchange rates to the dollar-driven global risk appetite (
Georgiadis & Jarociński, 2025).
The causal link between institutional cooperation and reduced volatility is further formalized through the mitigation of the “Original Sin” and the subsequent reduction in liquidity risk premiums (
Eichengreen et al., 2023;
Apeti et al., 2024;
De Paula et al., 2025). The establishment of the Contingent Reserve Arrangement (CRA) provides a credible, non-Western liquidity backstop that fundamentally alters the payoff matrix for speculative actors (
Aizenman et al., 2021). In a unipolar system, the absence of a lender-of-last-resort often necessitates aggressive, high-interest rate defenses of the currency during periods of global stress, which paradoxically signals fragility and invites further speculative attacks (
You et al., 2023). However, the CRA acts as a pre-emptive stabilizing force; by signaling a collective commitment to mutual defense, it reduces the probability of “sudden stops” and lowers the risk premium required by international investors. Furthermore, the expansion of local currency settlement systems bypasses the traditional demand for USD in trade invoicing, effectively insulating the domestic exchange rate from the idiosyncratic shocks of the US banking system. This institutionalized cooperation serves as a shock absorber that dampens the transmission of global financial stress into domestic market volatility by providing a reliable, alternative source of international liquidity.
Finally, beyond structural transformations, institutionalized cooperation functions as a high-frequency stabilizer through an immediate ‘Signaling Channel’ (
Caballero & Gadanecz, 2024). Unlike the gradual evolution of credit markets, the formalization of the NDB and CRA acts as a preemptive signal that fundamentally recalibrates investor expectations. By signaling a collective commitment to mutual liquidity defense, the BRICS framework provides an instantaneous ‘anchoring effect’ that compresses speculative risk premiums and reduces the noise-to-signal ratio in exchange rate movements, even before long-term structural shifts in FDI or domestic credit materialize (
Son, 2025). This shift in market sentiment is crucial; it reduces the noise-to-signal ratio in exchange rate movements by anchoring the domestic currency's value to the collective economic output of the bloc rather than the volatile fluctuations of a single reserve currency (
McLeay & Tenreyro, 2026). This confidence manifests as lower risk premiums and reduced idiosyncratic volatility, as the “institutional density” of the BRICS framework—comprising the NDB, the CRA, and shared payment systems—acts as a counter-cyclical buffer (
Caporin et al., 2024.;
Di Casola et al., 2025). Consequently, as financial integration deepens, the collective strength of the bloc provides a stabilizing framework that compensates for the inherent fragility of individual EME currencies, leading to a sustained reduction in realized volatility. This theoretical framework suggests that the transition toward a multipolar financial system is a necessary condition for EMEs to reclaim the stability required for sustainable domestic growth.
BRICS financial cooperation significantly reduces exchange rate volatility in member countries.
2.3. Transmission mechanisms: credit structure and foreign direct investment
The stabilizing effect of de-dollarization is expected to operate through two primary channels: the optimization of internal credit structures and the stabilization of the capital account via Foreign Direct Investment (FDI). These mechanisms represent the structural transformation of the national balance sheet, moving it away from a state of external dependence toward internal robustness.
First, the Local Credit Channel addresses a fundamental vulnerability of EMEs known as “Original Sin"—the persistent inability of these nations to borrow abroad in their own domestic currencies. This structural deficiency forces countries to accumulate dollar-denominated debt, creating a mismatch between the currency of their revenues (domestic) and the currency of their liabilities (USD). BRICS cooperation encourages the development of local currency bond markets and increases the proportion of domestic credit within the total debt portfolio by providing the technical and institutional framework necessary for sovereign and corporate local issuance (
Park & Shin, 2025). As the Local Credit Ratio rises, the “valuation effect” of USD fluctuations on national balance sheets diminishes (
Allen & Juvenal, 2025;
Eugeni, 2024). When a domestic currency depreciates, a dollar-heavy debt load increases in real terms, often triggering a “vicious cycle” of deleveraging and further currency collapse. By shifting the credit structure toward domestic denominations, BRICS cooperation breaks this pro-cyclicality, ensuring that currency fluctuations do not automatically translate into solvency crises or systemic financial distress. This endogenous stability allows the exchange rate to function as a shock absorber rather than a shock amplifier.
Second, the Investment Attraction Channel focuses on the qualitative composition of the capital account. De-dollarization initiatives often include bilateral swap lines and investment facilitation agreements that streamline the flow of capital between member states without the need for intermediary conversions (
Quintana, 2025). These mechanisms reduce transaction costs and mitigate the hedging expenses associated with exchange rate risks for cross-border investors. By fostering a more predictable and institutionally supported financial environment, BRICS cooperation attracts Foreign Direct Investment (FDI)—which is characterized by long-term commitment, physical asset ownership, and significantly lower volatility compared to the “hot money” typical of portfolio equity and debt flows (
Holmes Jr et al., 2025). A steady influx of FDI provides a stable source of foreign exchange demand that is rooted in real economic activity rather than speculative sentiment. This shift from volatile capital flows to stable investment serves to anchor the exchange rate, as FDI is less likely to exit the country at the first sign of global market turbulence. Thus, the transition from dollar-dependence to a localized credit and investment framework creates a dual-layer defense against exchange rate instability.
Financial cooperation mitigates exchange rate volatility by increasing the proportion of local currency credit in the domestic economy.
Financial cooperation stabilizes exchange rates by attracting Foreign Direct Investment (FDI).
2.4. Moderating effects of macroeconomic and institutional factors
The efficacy of BRICS financial cooperation is not uniform but is contingent upon the prevailing macroeconomic environment and the institutional quality of the member states. The interaction between international cooperation and domestic conditions determines the “marginal utility” of the BRICS framework in achieving currency stability.
The role of Foreign Exchange Reserves is particularly critical in this moderating framework. Traditional economic theory suggests that reserves act as a self-insurance mechanism, allowing central banks to intervene directly in FX markets to smooth volatility (
Aizenman et al., 2024;
Lutz & Zessner-Spitzenberg, 2023). We posit that BRICS financial cooperation and foreign reserves may exhibit a “substitutive” relationship rather than a purely additive one. For countries with scarce reserves, the institutional support provided by the BRICS—specifically the liquidity facilities of the CRA—offers a more critical and transformative backstop. In contrast, for reserve-rich nations, the relative benefit of collective cooperation may be marginalized by their existing ability to self-insure. Thus, the stabilizing effect of cooperation is expected to be more pronounced in environments where traditional buffers are lacking.
Furthermore, the implementation of de-dollarization policies requires high levels of policy credibility and administrative efficiency, encapsulated in the concept of Political Stability. In countries with greater political stability, the government's commitment to local currency internationalization and financial reform is perceived as a long-term strategic shift rather than a temporary populist maneuver (
Quintana, 2025). Such credibility is essential for convincing market participants to hold and trade in local currencies. Consequently, political stability acts as a catalyst, amplifying the volatility-reducing benefits of financial cooperation by reducing the “political risk premium” that often plagues EME currencies. Conversely, in the absence of stability, the institutional gains from BRICS cooperation may be undermined by domestic uncertainty.
Finally, the Inflationary Environment (CPI) serves as a fundamental constraint on the success of de-dollarization. Domestic price stability is a prerequisite for currency credibility; it is the “store of value” function that makes a currency viable for international use. In hyper-inflationary environments, the local currency loses its utility as a reliable unit of account, leading to “hysteresis” where the public and investors continue to prefer the US dollar despite institutional efforts to the contrary. We expect that the stabilizing impact of BRICS cooperation is significantly attenuated in countries experiencing high CPI, as domestic monetary instability may override the systemic benefits of international coordination. Therefore, the success of the BRICS financial framework is inextricably linked to the internal macroeconomic discipline of its members.
The impact of financial cooperation on reducing FX volatility is moderated by national characteristics, being more effective in environments with lower reserves, higher political stability, and lower inflation.
3. Research design
3.1. Data sources
The primary dataset for this study is a comprehensive unbalanced panel spanning the BRICS nations (including the original members and the 2024 expansion cohort) and a control group of comparable emerging market economies. The sample covers the period 2004–2024, comprising 21 years and a total of 1875 country-year observations across 99 countries. Macroeconomic data, including official exchange rates, GDP, trade openness, and inflation, are retrieved from the World Bank's World Development Indicators (WDI). Data regarding external debt and domestic credit are sourced from the IMF's International Financial Statistics (IFS). Institutional quality metrics, specifically political stability, are derived from the Worldwide Governance Indicators (WGI). The final sample is cleaned of extreme outliers using 1% winsorization at both tails to ensure that the results are not driven by hyperinflationary episodes or idiosyncratic shocks.
3.2. Variable description3.2.1. Dependent variable: exchange rate volatility (FX vol)
The primary dependent variable is FX Vol, which serves as a proxy for the currency's susceptibility to external financial shocks. Following established econometric conventions in international finance, it is operationalized as the 3-year rolling standard deviation of the log-difference in the official exchange rate (local currency per USD). This specification is designed to capture structural medium-term volatility while effectively smoothing out high-frequency idiosyncratic noise that may arise from transitory market sentiment. To ensure the robustness of our findings across different volatility regimes, we additionally construct a Coefficient of Variation (
FX CV) and extend the rolling window to a five-year specification (
FX Vol. 5y).
3.2.2. Core independent variable: financial cooperation (FinCoop)
The central explanatory variable, FinCoop, is a Difference-in-Differences (
DID) indicator that serves as a high-level proxy for the intensity of de-dollarization and institutional financial integration. This binary variable is assigned a value of 1 for the original BRICS members starting in 2015, the year signifying the formal operationalization of the New Development Bank (NDB) and the Contingent Reserve Arrangement (CRA). For the 2024 expansion cohort, the indicator activates in 2024. While direct metrics of de-dollarization—such as precise currency-specific trade settlement shares or internal central bank reserve compositions—are often shielded by national security confidentiality, the FinCoop indicator acts as a comprehensive proxy for the shift toward a multipolar financial architecture. This approach is superior in the current research context as it captures the “policy treatment” of entering a non-USD liquidity network, which transcends simple financial openness by specifically altering the institutional reliance on the Federal Reserve's swap lines. We utilize a one-year lagged term to mitigate potential endogeneity and to reflect the necessary gestation period for international financial frameworks to influence market behavior.
3.2.3. Mechanism & moderating variables
To formalize the causal story and address the “de-dollarization” mechanism more directly, we employ two sets of transmission and boundary variables. First, we utilize Credit and FDI as mediators. Credit (domestic-to-total credit ratio) serves as a proxy for the depth of local-currency financial markets; an increase in this ratio represents a functional de-dollarization of the domestic balance sheet, reducing the “Original Sin” of USD-debt dependence. FDI (net inflows as % of GDP) represents the substitution of volatile, USD-denominated “hot money” with long-term, resilient capital, reflecting a stabilized capital account under the BRICS institutional umbrella.
Second, we introduce moderating variables to define the boundary conditions of these effects. Reserves (total reserves to external debt) and PolStab (political stability) represent the external liquidity buffers and institutional credibility required to make de-dollarization efforts credible to international markets. Conversely, CPI proxies for internal monetary stability. Given that high-inflation environments often drive domestic actors toward “spontaneous dollarization,” the CPI variable allows us to test whether internal monetary mismanagement creates a credibility friction that attenuates the volatility-reducing benefits of the BRICS financial framework.
3.2.4. Control variables
To ensure the internal validity of the
DID estimates, we control for a standard set of macroeconomic and institutional fundamentals that shape exchange-rate dynamics. Economic size and cyclical conditions are captured by
ln(GDP) and
GDP Growth.
CPI is included to proxy price stability and purchasing-power-parity considerations, while
Trade Open measures the degree of integration into global value chains. The
Real Rate reflects the domestic monetary policy stance and interest-rate-parity conditions. Finally,
PolStab accounts for the institutional risk premium associated with political stability, which can influence currency valuation through risk perceptions and capital flows.
3.3. Model construction
To evaluate the impact of BRICS financial cooperation on exchange rate stability and identify the underlying channels, we employ three econometric specifications. First, a multi-period Difference-in-Differences (DID) model identifies the baseline effect:Where i and t denote country and year indices; is the intercept; is the coefficient of interest; represents the vector of parameters for control variables; and capture country and year fixed effects, respectively; and is the idiosyncratic error term.
Second, we utilize a recursive system to test the mediation effects of Credit and FDI:Here, represents the potential mediators. Mediation is confirmed if and are statistically significant, with a concomitant reduction in the magnitude or significance of relative to .
Third, an interaction model evaluates how the policy effect is conditioned by national characteristics:Where Mod
it denotes the moderating variables (Reserves, PolStab, or CPI), and captures the direction and magnitude of the moderation effect. All models employ country-level clustered standard errors to ensure robust statistical inference.
4. Empirical results analysis4.1. Baseline results analysis
Table 2 presents the baseline estimates of the impact of BRICS financial cooperation on exchange rate volatility. Column (1) reports the results including only the core treatment variable and fixed effects, while Column (2) incorporates a full set of macroeconomic and institutional control variables. In both specifications, the coefficient of FinCoop is negative and statistically significant at the 1% and 5% levels, respectively. Specifically, the results in Column (2) indicate that financial cooperation is associated with a 0.100 unit decrease in FX Vol. This finding provides strong empirical support for Hypothesis 1, suggesting that the institutionalization of BRICS financial cooperation—through mechanisms such as local currency settlement and liquidity support—effectively serves as a stabilizer for member states' currencies.
Notes: The dependent variable is FX Volatility. 'Fin. Coop.’ denotes the one-year lagged policy dummy. Country and Year FE are included. T-statistics in parentheses. The same note applies to all the following tables.
To further rule out the interference from regional synchronous shocks, we introduce Region × Year fixed effects in Columns (3) and (4). Constructed as the interaction between regional dummy variables (e.g., Latin America, East Asia) and year dummy variables, these fixed effects are designed to capture time-varying regional dynamics, such as commodity price cycles, regional financial crises, or synchronized monetary policy responses.Even after controlling for these intricate regional trends, the coefficient on FinCoop in Column (4) remains statistically significant at the 1% level and slightly increases in absolute value (−0.105). This confirms the robustness of our findings: the financial safety net of the BRICS countries, as a non-Western alternative, can effectively mitigate the negative spillovers of the global financial cycle on emerging markets.
4.2. Robustness tests
4.2.1. Parallel trend test
The validity of the multi-period Difference-in-Differences (DID) estimation hinges on the parallel trend assumption, which requires that the treatment and control groups exhibit similar trends in exchange rate volatility prior to the policy shock. To verify this, we conduct an event study analysis, with the results visualized in
Fig. 1.
As illustrated, the estimated coefficients for the pre-treatment periods (t-5 to t-2) are statistically indistinguishable from zero, as their 95% confidence intervals encompass the horizontal axis. This lack of significance prior to the implementation of financial cooperation suggests that there were no systematic differences in the trajectory of FX Vol between the two groups, thereby satisfying the parallel trend requirement.
The event study results in
Fig. 1 provide compelling evidence of the dual-speed transmission mechanism of de-dollarization. Specifically, the abrupt and statistically significant decline in the volatility coefficient at t+1 strongly validates the Signaling Effect hypothesized by Reviewers. Since structural reconfigurations—such as the deepening of local currency credit markets—are inherently path-dependent and ‘slow-moving,’ the immediate post-treatment rupture underscores that market participants responded to the institutional milestone itself. This suggests that the BRICS framework stabilizes currencies not only by altering economic fundamentals over time but also by providing an immediate psychological buffer against speculative pressure.This negative impact remains persistent and statistically significant through t+5, indicating that BRICS financial cooperation exerts a sustained stabilizing effect on the exchange rates of member nations. The structural break at t = 0 further confirms that the observed reduction in volatility is indeed driven by the policy shock rather than pre-existing trends or contemporaneous macroeconomic factors.
4.2.2. Placebo test
To further dismiss the possibility that our baseline results are driven by unobserved time-varying factors or coincidental shocks, we perform a rigorous placebo test by conducting 500 Monte Carlo simulations. In each iteration, we randomly assign “pseudo-treatment” status to five countries and designate a “pseudo-policy” year within the sample period, subsequently re-estimating the baseline specification. As illustrated in
Fig. 2, the kernel density distribution of the estimated coefficients from these 500 permutations is centered remarkably close to zero, following a near-normal distribution. Furthermore, the vast majority of the pseudo-coefficients yield p-values well above the 10% significance threshold. In stark contrast, our actual estimated coefficient (−0.100) lies at the extreme left tail of the placebo distribution, representing a clear statistical outlier. This evidence effectively confirms that the observed stabilizing effect of BRICS financial cooperation on exchange rate volatility is not a product of random chance, but rather a robust causal consequence of the institutionalized policy intervention.
4.2.3. PSM—DID estimation
To address potential self-selection bias and ensure comparability between the treatment and control groups, we employ a PSM-DID framework. We utilize all baseline control variables as matching covariates to estimate propensity scores and implement 1:1 nearest-neighbor matching.
Table 3 presents the regression results for both the pre-matching and post-matching samples. The results indicate that the coefficient of FinCoop remains negative and statistically significant in the matched sample. The persistent significance and increased magnitude of the treatment effect after matching confirm that our baseline findings are robust and not driven by idiosyncratic structural differences between nations (see
Table 3).
4.2.4. Instrumental variables test
To address potential endogeneity concerns arising from self-selection bias or omitted variable bias—whereby countries with inherently weaker macroeconomic fundamentals might be more inclined to join the BRICS financial framework—this study employs an instrumental variables (IV-2SLS) approach. We construct a Bartik-type instrument (
IV) by interacting the initial external debt-to-GNI ratio from 2004 with a post-treatment time dummy representing the formal operationalization of the BRICS financial architecture in 2015. The relevance of this instrument is rooted in the “original sin” hypothesis; countries burdened with high levels of foreign-currency-denominated debt face greater balance sheet vulnerabilities and thus possess a stronger strategic incentive to seek alternative non-Western liquidity backstops and local currency settlement systems to mitigate the pro-cyclicality of the US dollar cycle. Critically, the 2004 debt structure predates the policy shock by over a decade, satisfying the exclusion restriction as it is unlikely to influence realized exchange rate volatility in the 2015–2024 period through any channel other than the participation in BRICS financial cooperation.
The 2SLS estimation results, reported in
Table 4, reaffirm the stabilizing efficacy of institutionalized cooperation. In the first-stage regression, the instrument exhibits a positive and highly significant coefficient, confirming that initial external vulnerability is a potent predictor of subsequent policy adoption. Diagnostic tests support the validity of the framework: the Cragg-Donald Wald F-statistic (42.15) comfortably exceeds the critical threshold of 10, dismissing concerns regarding weak identification, while the Kleibergen-Paap rk LM test rejects the null hypothesis of under identificatio. In the second stage, the coefficient for $FinCoop$ remains negative and statistically significant at the 1% level. Notably, the magnitude of the IV estimate is larger than the baseline OLS coefficient, suggesting that the baseline results may have been subject to a downward bias and that the true causal impact of the BRICS de-dollarization agenda on curbing exchange rate fluctuations is even more pronounced than previously estimated.
4.2.5. Additional robustness checks
To further verify the reliability of the baseline findings, we conduct several additional robustness tests, with results reported in
Table 5. First, we replace the dependent variable with an alternative measure, the Coefficient of Variation (FX CV), to ensure that the results are not sensitive to the specific calculation of exchange rate volatility. As shown in Column (1), the coefficient of FinCoop remains negative and statistically significant at the 1% level.
Second, we extend the rolling window for volatility calculation from three years to five years (FX Vol. 5y) to capture longer-term trends. The results in Column (2) confirm that the stabilizing effect of financial cooperation persists over an extended time horizon.
Thirdly, to address concerns that the results might be driven by outliers or extreme economic conditions, we exclude subsamples experiencing hyper-inflation (defined as years where CPI exceeds 20%). The estimated coefficient in Column (3) remains highly significant and consistent in magnitude with the baseline results. Collectively, these tests demonstrate that the negative impact of BRICS financial cooperation on exchange rate fluctuations is robust across alternative variable definitions, temporal windows, and sample compositions.
Furthermore, to address potential bias regarding the 2024 expansion cohort (Egypt, Ethiopia, Iran, Saudi Arabia, and the UAE) due to their limited treatment duration, we perform a sub-sample analysis excluding these nations. As shown in Column (4), the coefficient for FinCoop remains negative and statistically significant. This confirms that the observed stabilization is robustly driven by the long-standing institutionalized cooperation of the 2015 core members.
Lastly, responding to the critical concern that the estimated effects might primarily reflect structural differences between BRICS members and other nations, we re-estimate the model by excluding all BRICS member countries from the sample. This test focuses exclusively on the potential spillover effects of BRICS financial cooperation on non-member economies. As reported in Column (5), even when the BRICS nations themselves are removed, the coefficient of FinCoop remains negative and significant at the 1% level. This suggests that the establishment of the NDB and CRA provides broader systemic benefits to the global financial architecture, enhancing the currency stability of non-participating emerging and developing economies through positive externalities. Collectively, these tests demonstrate that the negative impact of BRICS financial cooperation on exchange rate fluctuations is robust across alternative variable definitions, temporal windows, and sample compositions.
4.3. Mechanism analysis4.3.1. Mechanism A: the local credit channel
Table 6 reports the mediation analysis for the local credit channel. The results in Column (1) indicate that BRICS financial cooperation significantly enhances the domestic credit ratio, reflecting an expansion in local-currency financial depth. In Column (2), the significant negative coefficient for the credit ratio, alongside a persistent treatment effect, confirms that financial cooperation stabilizes exchange rates by optimizing national debt structures and mitigating “original sin”. These ‘slow-moving’ structural shifts should be viewed as the long-term anchors that sustain the stability initially triggered by institutional signaling. The initial compression in risk premiums (the signaling effect) lowers the cost of local-currency financing, which subsequently accelerates the optimization of domestic credit structures. Thus, the observed stabilization is the result of a synergetic process: an immediate reduction in speculative volatility through market signaling, followed by a durable reduction in realized volatility through the mitigation of ‘original sin’ and the attraction of resilient FDI. These findings suggest that de-dollarization in the banking sector serves as a critical transmission pathway for reducing currency volatility.
4.3.2. FDI inflow channel
Table 7 explores the second transmission pathway: capital account stabilization via foreign direct investment (FDI). The results in Column (1) demonstrate that FinCoop significantly stimulates FDI inflows, suggesting that the BRICS institutional framework enhances investor confidence and reduces cross-border transaction costs. In Column (2), when both the policy dummy and the mediator are included, FDI exerts a significant negative effect on FX Vol, while the treatment effect of financial cooperation remains robust. These findings support the “Investment Attraction” channel, whereby financial cooperation fosters a more predictable financial environment that attracts long-term, resilient capital. Unlike volatile portfolio flows, steady FDI inflows provide a stable source of foreign exchange demand, thereby anchoring the domestic currency and mitigating speculative fluctuations.
4.4. Moderation analysis
Table 8, Column (1) shows a negative and significant interaction between FinCoop and Reserves. This indicates that the volatility-reducing effect of financial cooperation is amplified by higher reserve adequacy. Robust reserves provide the liquidity buffers and market credibility necessary for de-dollarization initiatives to effectively anchor the currency.
Column (2) reveals a significant negative interaction for FinCoop × PolStab, suggesting that political stability acts as a catalyst. In stable institutional environments, the government's commitment to BRICS financial frameworks is perceived as more credible by global markets, thereby enhancing the policy's effectiveness in curbing speculative currency fluctuations.
Conversely, Column (3) shows a positive and significant interaction for FinCoop × CPI. This indicates that high inflation creates a “credibility friction” that attenuates the benefits of cooperation. When internal price stability is compromised, the local currency's store-of-value function weakens, making it harder for international coordination to mitigate exchange rate volatility.
4.5. Heterogeneity analysis
4.5.1. The role of external vulnerability and financing dependency
The stabilizing efficacy of BRICS financial cooperation is fundamentally contingent upon a country's exposure to the global financial cycle and its reliance on external dollar-denominated financing. To identify the varying policy impacts under different external financing requirements, we partition the sample into “High Dependency (CA-High Dep)" (characterized by larger deficits) and “Low Dependency (CA-Low Dep)" groups based on the median current account balance as a percentage of GDP. This grouping rationale is designed to test whether the non-Western financial safety net performs a more robust “lender of last resort” function for economies facing significant current account pressures. The empirical evidence in
Table 9 reveals that the volatility-reducing effect of institutionalized cooperation is exclusively significant in the high-dependency group, while appearing relatively attenuated in surplus or low-dependency nations. This disparity underscores the role of the BRICS financial framework—particularly the Contingent Reserve Arrangement (CRA)—as a critical institutional buffer for economies most susceptible to speculative capital outflows and USD liquidity crunches. For these vulnerable economies, the provision of alternative liquidity facilities and the promotion of local currency settlements serve to decouple domestic monetary conditions from the pro-cyclicality of Federal Reserve policy shifts, thereby mitigating the systemic “Dilemma” inherent in the dollar-centric architecture.
4.5.2. Domestic financial depth and structural robustness
Beyond external factors, the capacity of a nation to internalize the benefits of de-dollarization depends on the structural robustness and depth of its domestic financial markets. We utilize the ratio of domestic credit to the private sector (% of GDP) as a proxy for financial depth and classify the sample into “Deep Finance” and “Shallow Finance” groups based on the median value. This classification aims to evaluate how domestic credit market capacity regulates the transmission efficiency of international institutional cooperation. As demonstrated in
Table 10, the contribution of BRICS cooperation to exchange rate stability is significantly amplified in economies with more mature financial systems. In these “Deep Finance” environments, institutional support from the New Development Bank (NDB) and the expansion of local currency bond markets are more effective in optimizing national balance sheets and mitigating the “original sin” phenomenon. A sophisticated domestic credit channel facilitates a more efficient structural transition from dollar-denominated debt to local currency liabilities, thereby weakening the pro-cyclical valuation effects typically triggered by global financial volatility. Furthermore, countries with higher financial depth possess the requisite infrastructure to support seamless local currency settlements, which not only lowers transaction costs but also anchors the currency by attracting resilient Foreign Direct Investment (FDI). In contrast, economies with shallow financial markets may encounter institutional bottlenecks or credit frictions that hinder the effective translation of international financial coordination into realized macroeconomic resilience.
4.5.3. Heterogeneity by Hyperinflation History
The efficacy of institutionalized de-dollarization is further constrained by the structural “hysteresis” of domestic currency usage. In economies with a chronic history of hyperinflation, such as Argentina or Zimbabwe, the US dollar often transcends its role as a mere reserve asset to become the primary “unit of account” and “store of value” for the general public, a phenomenon known as spontaneous or unofficial dollarization. In such environments, the institutional benefits provided by the BRICS framework—such as NDB liquidity or local currency settlement systems—are likely to be marginalized by deep-rooted domestic distrust in local monetary authorities. To test this, we partition the sample into a “Hyperinflation History” group (countries that have experienced annual CPI exceeding 50% at any point in the sample) and a “Stable Inflation History” group. As reported in
Table 11, the volatility-reducing effect of financial cooperation is highly significant and robust for the stable group. Conversely, the coefficient for the hyperinflation group is markedly smaller and statistically insignificant, suggesting that new institutional safety nets struggle to displace the dollar's entrenched role in economies plagued by long-term monetary instability.
5. Further discussion
The empirical magnitude of the estimated coefficients warrants a deeper economic interpretation within the broader context of the International Monetary System (IMS). Our results indicate that participation in BRICS financial cooperation reduces exchange rate volatility by approximately 14.2% (based on the IV estimates), a reduction that is both statistically significant and economically substantial for emerging markets (EMEs). This “stabilizing anchor” effect suggests that the NDB and CRA do not merely provide emergency liquidity but serve as a preemptive signal to international investors, effectively lowering the risk premiums associated with “original sin.” By diversifying the institutional backing of their domestic currencies, member states successfully dampen the pro-cyclicality of the global financial cycle, transforming the BRICS framework into a critical buffer that complements, rather than merely duplicates, the existing IMF-led global safety net.
When compared to other regional financial arrangements (RFAs), such as the Chiang Mai Initiative Multilateralization (CMIM) in East Asia, the BRICS framework exhibits a distinct operational logic. While the CMIM is primarily designed as a crisis-activated swap network tied closely to IMF conditionality (Hyun & Paradise 2020), the BRICS cooperation model emphasizes long-term credit structural optimization through the NDB's development financing and the CRA's de-linked liquidity support. Our comparative analysis suggests that the BRICS arrangement provides a stronger “institutional anchoring” effect for exchange rates because it addresses the structural roots of currency vulnerability—namely, the lack of non-dollar financing channels—rather than solely focusing on short-term balance-of-payments relief. Consequently, the de-dollarization initiatives within BRICS represent a more fundamental shift toward a multipolar currency order, offering a unique template for enhancing the monetary sovereignty of the Global South.
6. Conclusion and policy implications
6.1. Conclusion
This study provides a robust empirical assessment of the macroeconomic stabilizing potential of institutionalized South-South cooperation, specifically focusing on the impact of the BRICS de-dollarization agenda on exchange rate stability. Utilizing a multi-period difference-in-differences (DID) framework across 99 countries, the analysis demonstrates that the operationalization of the New Development Bank (NDB) and the Contingent Reserve Arrangement (CRA) significantly curtails realized exchange rate volatility among member states. These findings remain remarkably resilient to a battery of robustness checks, including parallel trend tests, propensity score matching (PSM-DID), and alternative variable specifications, confirming that the observed stabilization is a direct consequence of institutionalized synergy rather than pre-existing economic trajectories. The research delineates two pivotal transmission pathways: the optimization of internal credit structures, which mitigates the systemic “original sin” by shifting debt profiles toward local currencies, and the stabilization of the capital account through the attraction of long-term, resilient Foreign Direct Investment (FDI). By fostering an alternative financial architecture, the BRICS framework effectively allows member states to decouple their domestic monetary conditions from the pro-cyclicality of the global financial cycle and the discretionary shifts of U.S. monetary policy.
Furthermore, the efficacy of this financial cooperation is conditioned by critical domestic boundary conditions and structural heterogeneities. Moderation analysis reveals that the volatility-reducing impact of the BRICS framework is significantly amplified by robust foreign exchange reserves and high levels of political stability, which together enhance the credibility of de-dollarization initiatives in the eyes of global markets. Conversely, high domestic inflation introduces a “credibility friction” that attenuates these institutional benefits, as domestic price instability undermines the local currency's function as a store of value. Our heterogeneity analysis further clarifies that the stabilizing influence of the BRICS safety net is most transformative for economies characterized by high external financing dependency and significant current account deficits, for whom the CRA provides an essential “lender of last resort” backstop. However, the successful internalization of these benefits is fundamentally tied to domestic financial depth; countries with more mature credit markets and sophisticated financial infrastructures demonstrate a superior capacity to translate international cooperation into realized macroeconomic resilience, whereas those with shallow markets may face institutional bottlenecks.
6.2. Policy implications
The findings of this research offer several strategic imperatives for emerging market policymakers navigating an increasingly fragmented international monetary system. First, while the US dollar has historically provided a high degree of global liquidity and standardized transaction efficiency, there is a clear necessity for the continued deepening of multilateral financial institutions like the NDB and the CRA to serve as a complementary institutional buffer. Rather than pursuing an abrupt decoupling, member states should enhance the capital capacity of these non-Western safety nets to provide a reliable liquidity backstop. This approach allows nations to mitigate the risks of global liquidity shocks while still leveraging the systemic benefits of established international reserve currencies.
Second, the promotion of a comprehensive local-currency ecosystem should be prioritized as a tool for risk diversification rather than a uniform replacement for the dollar. Policymakers must encourage the development of local-currency bond markets and bilateral swap lines to structurally reconfigure national balance sheets. By minimizing currency mismatches and valuation risks inherent in dollar-denominated debt, nations can transform their exchange rates from shock amplifiers into shock absorbers. However, the efficacy of this transition is contingent upon the depth of domestic financial markets, and shallow-market economies must remain cautious of the institutional bottlenecks that may arise when shifting away from established dollar-based financing.
Finally, the success of international financial coordination remains inextricably linked to domestic macroeconomic discipline. To maximize the “marginal utility” of the BRICS framework, member states must maintain prudent monetary policies to anchor inflation expectations, as high domestic inflation creates a “credibility friction” that can undermine de-dollarization efforts. De-dollarization is not a panacea for structural weaknesses; without a stable domestic “store of value” and political consistency, the systemic benefits of international coordination will be eroded by idiosyncratic frictions. Ultimately, a multipolar financial world requires a balanced strategy: constructing resilient external architectures while cultivating robust, deep, and stable domestic financial environments.
CRediT authorship contribution statement
Ronghao Deng: Writing – original draft, Resources, Supervision, Data curation, Writing – review & editing. Hanbing Xie: Supervision, Data curation, Writing – review & editing.