Currency Crisis
A currency crisis occurs when a speculative attack forces a country to abandon a fixed exchange rate, sharply devalue its currency, or exhaust its foreign exchange reserves defending an unsustainable parity. Currency crises are among the most disruptive events in international finance, often accompanied by recessions, bank failures, and sovereign debt distress.
Causes and Triggers
Currency crises typically arise from a combination of inconsistent macroeconomic policies, external imbalances, and fragile financial systems. A common pattern is a persistent fiscal deficit financed by money creation, which undermines confidence in the currency's value and invites speculation against the peg. Large current account deficits, financed by short-term external borrowing, create vulnerability to a reversal in capital flows.
Inconsistencies between domestic and external objectives are central. A country that attempts to maintain a fixed rate while pursuing an expansionary monetary policy will lose reserves, since domestic interest rates fall below the level consistent with the peg. Once reserves fall below a critical level, speculators anticipate devaluation and attack, accelerating the collapse.
Models of Crisis
First-generation models emphasise the exhaustion of reserves arising from policy inconsistencies. Speculators attack when the shadow floating exchange rate, the rate that would prevail without intervention, rises above the fixed parity. The collapse occurs before official reserves are exhausted, because rational speculators act in anticipation.
Second-generation models focus on self-fulfilling expectations. Multiple equilibria can exist: if speculators expect devaluation, the cost of defending the peg rises and the expectation becomes self-validating. The government's willingness to defend depends on the trade-offs it faces, including the output cost of high interest rates and the fiscal cost of intervention.
Third-generation models incorporate financial fragility. Currency and banking crises interact: a devaluation weakens bank and corporate balance sheets when liabilities are denominated in foreign currency, triggering credit contraction and deepening the recession, which in turn worsens the currency's prospects.
Consequences and Policy Responses
Currency crises impose large output losses, inflate the real burden of foreign currency debt, and can spill over to other countries through trade and financial linkages. Policy responses include raising interest rates to defend the currency, intervening in the market, imposing capital controls, and, ultimately, allowing the currency to float. The choice between defence and adjustment involves difficult trade-offs, since high rates may deepen recessions while devaluation may destabilise balance sheets.
Crisis prevention focuses on sound fiscal policy, adequate reserves, flexible exchange rates or credible pegs, and resilient financial systems. Regional financing arrangements and international facilities complement domestic policy in providing liquidity to countries facing temporary pressures.
Historical Episodes
Currency crises have punctuated the history of the international monetary system. The collapse of the gold standard in the 1930s, the breakdown of Bretton Woods in the early 1970s, and the Latin American debt crisis of the 1980s each combined currency and debt problems. The 1990s saw crises in Europe, Mexico, East Asia, Russia, and Brazil, and the 2000s brought further episodes in Argentina and elsewhere.
The East Asian crisis of 1997 and 1998 is particularly instructive. Countries with sound fiscal positions and relatively low inflation experienced severe crises, driven by the interaction of fragile financial systems, short-term external debt, and sudden reversals of capital flows. The crisis demonstrated that currency and banking vulnerabilities can arise even without obvious fiscal imbalances.
Early Warning Indicators
Research has sought to identify indicators that predict crises. Commonly cited signals include overvaluation of the real exchange rate, rapid growth of domestic credit, a rising ratio of short-term external debt to reserves, a widening current account deficit, and falling export growth. None of these indicators is reliable on its own, and the predictive power of early warning systems remains limited, partly because crises often have idiosyncratic triggers.
The difficulty of prediction reflects the role of expectations and coordination. Crises can occur when fundamentals are weak, but also when a shift in beliefs makes a previously sustainable position untenable, generating a self-fulfilling attack.
Policy Choices During a Crisis
Faced with speculative pressure, authorities must choose among competing responses. Defending the peg by raising interest rates and intervening can preserve credibility but may impose severe output costs, particularly if banks and firms are highly leveraged. Allowing depreciation can restore competitiveness but may destabilise balance sheets and raise inflation.
Capital controls can slow outflows and provide breathing space, though their effectiveness and costs are debated. International financial assistance can supplement reserves and support adjustment, but typically comes with conditions that may themselves be contractionary. The optimal response depends on the source of the crisis and the structure of the economy.
Lessons and Reform
The experience of recurrent crises has led to reforms aimed at reducing vulnerability. These include the accumulation of reserves, the development of local currency bond markets to reduce currency mismatches, the adoption of more flexible exchange rates, and the strengthening of financial supervision. International initiatives have sought to improve the resolution of sovereign debt and to provide liquidity through regional and global facilities. The persistence of crises suggests that reform has been partial, and that the balance between integration and resilience remains a central policy challenge.