Adequate Reserves Shield Economies From Shocks and Strengthen Resilience

IMF Blog, March 5, 2026

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Canonical URL: Adequate Reserves Shield Economies From Shocks and Strengthen Resilience

Author: Pierre-Olivier Gourinchas
Date: March 5, 2026
Central message: Building adequate foreign exchange reserves strengthens resilience to shocks, but accumulation requires sound policies, time, and global cooperation to lower the cost of holding reserves.

Reserves provide liquid resources that can be sold quickly to manage unexpected shocks.
A common characteristic of crisis-prone countries is the low level of reserves.
Reserves matter across exchange rate regimes:
- Fixed exchange rate regimes tend to require more reserves to back currencies.
- Reserves are also critical for flexible exchange rate regimes to contain excessive currency volatility and associated macroeconomic costs.
For many low-income economies, the global financial safety net (IMF resources, bilateral or regional swap lines, and official reserves) remains insufficient to manage severe shocks.

Reserve accumulation is most effective when done organically rather than by short-term foreign-exchange borrowing from private or official creditors.
Historical evidence: Successful stabilization programs of the late 1980s and early 1990s show reserves must be purchased over sustained periods; there is no shortcut.
Typical sequencing:
- Initially supported by fiscal and current account surpluses.
- Net private capital inflows play a greater role as stabilization becomes entrenched.
Risks of excessive reliance on volatile flows and insufficient exchange rate flexibility:
- Programs using volatile financial flows and an overly appreciated exchange rate can terminate abruptly once capital flows stop and reverse.
Balance of payments sustainability depends on whether countries can run sufficiently large trade surpluses to cover dividends and interest payments on external private and public liabilities while simultaneously building or maintaining adequate reserves.

Political-economy considerations can impede reserve accumulation (e.g., pressure for short-term political gains leading to postponed policy adjustments and reserve depletion).
Countries that overcame these constraints built consensus on macroeconomic principles of fiscal and external discipline.
Building reserves takes time and requires patience; successful cases balanced inflation, external stability, sustained growth, and societal consensus.

Reserves are expensive because safety and liquidity command a premium; reserve assets typically offer much lower returns than alternative uses.
High opportunity cost (the price of self-insurance) discourages reserve accumulation.
Reserve accumulation can stoke inflation if not sterilized.

Explore ways to reduce the global cost of building reserve buffers and increase the menu of suitable investment options for central banks.
Proposed measures described:
- Expand the menu of certified reserve assets to include carefully selected portfolios comprising longer-term dollar bonds as well as other dollar assets, in addition to short-term US Treasuries.
- Invest such dollar reserves through a common fund to reduce transaction costs while preserving liquidity.
Expected benefits:
- Increasing the supply of dollar reserve assets and investing through a common fund could potentially add substantially to the annual return on dollar reserve assets for similar levels of risk.
- Lowering the cost of reserve accumulation would make adequate reserve build-up a more attractive proposition.

Domestic policy imperatives:
- Build reserves organically via sustainable fiscal and external policies.
- Avoid shortcuts, overreliance on financial engineering, and short-term foreign-exchange borrowing.
- Invest in macroeconomic stability and institutions to support buffer accumulation.
Global cooperative actions:
- Facilitate channels where countries can work together to reduce the cost of self-insurance.
- Expand and diversify certified reserve asset options and consider pooled investment mechanisms to improve returns and liquidity for reserve holders.

Official reserve holdings have increased considerably over the past 25 years but remain highly concentrated.
Some countries hold reserves in excess of measurable needs; the issue for them is having too many reserves, not too few.
Many emerging and developing economies have strengthened their economies by balancing policy objectives and building societal consensus around sound economic discipline.
For many low-income countries, the IMF’s reserve adequacy metric suggests higher reserve levels would improve resilience.

Pierre-Olivier Gourinchas, March 5, 2026