7.1 Fixed vs. floating exchange rate regimes

Exchange Rate Regimes

Exchange rate regimes determine how a country's currency is valued relative to others. The regime a country chooses has direct consequences for its monetary policy autonomy, inflation control, and ability to absorb economic shocks. This section covers the core distinction between fixed and floating systems, the trade-offs involved, and the historical episodes that illustrate why countries switch between them.

Fixed vs. Floating Exchange Rates

A fixed exchange rate system pegs a country's currency to another currency (like the U.S. dollar) or to a basket of currencies. The central bank actively intervenes in the foreign exchange market to maintain this peg, buying or selling its own currency as needed. This requires holding sufficient foreign exchange reserves to defend the rate.

A floating exchange rate system lets the exchange rate be determined by market forces of supply and demand, without central bank intervention. The rate fluctuates freely in response to economic conditions, capital flows, and market sentiment.

Most real-world regimes fall somewhere between these two extremes. A managed float (or "dirty float") is common, where the central bank occasionally intervenes to smooth out sharp movements but doesn't commit to a specific rate.

Pros and Cons of Exchange Regimes

Advantages of fixed rates:

• Provide stability and predictability for international trade and investment. Businesses signing long-term contracts face less exchange rate risk, which encourages cross-border commerce.
• Can help control inflation by anchoring domestic prices to a stable foreign currency. A country with chronic inflation might peg to the U.S. dollar to "import" credibility from the Fed's monetary policy.

Disadvantages of fixed rates:

• Require sacrificing monetary policy autonomy. The central bank must prioritize defending the peg over responding to domestic economic conditions (like a recession).
• Vulnerable to speculative attacks if markets doubt the peg's credibility. George Soros famously bet against the British pound in 1992, forcing the UK out of the European Exchange Rate Mechanism and earning roughly $1 billion in the process.
• Can lead to misalignment between the exchange rate and economic fundamentals. If a currency is pegged at an overvalued rate, exports become uncompetitive; if undervalued, imports become artificially expensive.

Advantages of floating rates:

• Allow automatic adjustment to economic shocks. If oil prices spike, a floating currency can depreciate, cushioning the blow to the domestic economy by making exports cheaper.
• Provide greater monetary policy autonomy, since the central bank doesn't need to defend a specific rate.
• Reduce the need for large foreign exchange reserves.

Disadvantages of floating rates:

• Can produce significant exchange rate volatility, creating uncertainty for businesses engaged in international trade.
• May be subject to excessive speculation and overshooting, where the exchange rate moves well beyond what fundamentals justify before correcting.

Factors in Exchange Rate Decisions

Countries weigh several factors when choosing a regime:

Economic size and openness. Smaller, more open economies like Singapore tend to prefer fixed or heavily managed rates because exchange rate swings would disrupt a large share of their economic activity. Larger, relatively closed economies like the United States can tolerate floating rates because trade makes up a smaller share of GDP, and policy autonomy matters more.

Macroeconomic stability. Countries with high inflation or unstable macroeconomic conditions (Argentina is a recurring example) may adopt a fixed rate as a nominal anchor to discipline monetary policy and bring inflation expectations down. Countries with already-stable conditions, like Canada, tend to prefer floating rates so they can use monetary policy to absorb shocks.

Financial market development. Countries with less developed financial markets often lack the instruments (like hedging contracts) that help businesses manage exchange rate risk, making a fixed rate more attractive for stability. Countries with deep, liquid financial markets, like Japan, can rely on market-based adjustment mechanisms that work well under a float.

Political and institutional factors. Regional integration goals drove the creation of the Eurozone. Historical ties, such as those between former colonies and their colonizers, have also motivated fixed-rate arrangements. Conversely, countries that prioritize monetary sovereignty and want to avoid external constraints on policy tend to favor floating rates.

Historical Shifts in Exchange Systems

1. Bretton Woods (1944–1971). The postwar international monetary system pegged currencies to the U.S. dollar, which was itself convertible to gold at $35 per ounce. This provided remarkable stability for decades of postwar recovery and trade expansion. The system broke down when persistent U.S. balance of payments deficits eroded confidence in the dollar's gold convertibility. President Nixon suspended gold convertibility in 1971, ending the system.

2. European Monetary System (1979–1999). European countries created the Exchange Rate Mechanism (ERM) to maintain fixed exchange rates among their currencies within agreed-upon bands. The 1992–1993 ERM crisis saw speculative attacks on weaker currencies like the Italian lira and the British pound, forcing several countries out of the mechanism and leading to a widening of the permitted exchange rate bands.

3. Asian Financial Crisis (1997–1998). Several Asian economies, including Thailand, South Korea, and Indonesia, maintained fixed pegs to the U.S. dollar. When capital flight and speculative pressure mounted, these countries were forced to abandon their pegs. The sudden shift to floating rates brought sharp currency depreciations, significant economic contraction, and financial instability across the region. Thailand's baht lost roughly half its value within months.

4. Eurozone (1999–present). Member countries adopted the euro, eliminating exchange rate risk within the bloc and reducing transaction costs. However, individual countries gave up the ability to adjust their exchange rates in response to country-specific shocks. This became painfully clear during the European debt crisis, when countries like Greece could not devalue their currency to regain competitiveness and instead faced prolonged austerity and deep recessions.