7.2 Managed float and currency boards

Exchange Rate Systems

Managed Float Exchange Rate System

A managed float (sometimes called a "dirty float") is a system where a currency's value is primarily set by supply and demand in the foreign exchange market, but the central bank steps in when needed to influence the rate. The goal is to get the best of both worlds: market-driven pricing with a safety net against wild swings.

Key features of managed float systems:

• The exchange rate is not pegged to another currency or commodity like gold
• The central bank typically sets a target range or band for the exchange rate (for example, ±2% from a central rate)
• When the rate drifts outside that band, the central bank intervenes by buying or selling foreign currency reserves to push it back

The objectives behind this approach:

• Prevent sharp swings in the exchange rate that could hurt importers, exporters, or investors
• Maintain trade competitiveness by avoiding extreme appreciation or depreciation
• Retain flexibility to adjust when economic conditions change, such as a shift in global interest rates or a financial crisis

Currency Boards for Monetary Stability

A currency board is a much stricter arrangement. It's a monetary authority that issues domestic currency fully backed by a foreign reserve currency at a fixed exchange rate. Think of it as the government making a hard promise: every unit of domestic currency can be exchanged for the reserve currency at a set rate, no questions asked.

How currency boards work:

1. The board fixes the exchange rate between the domestic currency and a chosen reserve currency (e.g., the US dollar or the euro)
2. It guarantees full convertibility, meaning anyone can exchange domestic currency for the reserve currency at that fixed rate without restrictions
3. It holds foreign exchange reserves equal to at least 100% of the domestic currency in circulation, so every unit issued is backed

Why this promotes stability:

• The central bank gives up discretionary monetary policy. It can't freely adjust the money supply or set interest rates to stimulate the economy. This sounds like a drawback, but it removes the temptation to print money recklessly.
• The reserve requirement forces discipline. If reserves fall, the board must contract the money supply.
• The fixed rate acts as a credible anchor for inflation expectations. Businesses and consumers trust that the currency won't suddenly lose value, which keeps prices more stable.

Managed Float vs. Currency Boards

These two systems share a common goal of reducing exchange rate volatility, but they take very different paths to get there.

Similarities:

• Both aim to keep the exchange rate relatively stable
• Both involve some form of central bank activity in the foreign exchange market

Key differences:

Advantages of managed floats:

• Flexibility to respond to economic shocks like sudden changes in commodity prices or capital flows
• The central bank keeps some ability to use interest rates and money supply as policy tools

Limitations of managed floats:

• Requires constant, active management by the central bank
• If markets doubt the central bank's commitment to the target range, speculators may attack the currency, potentially triggering a crisis

Advantages of currency boards:

• High credibility, especially valuable for countries with a history of hyperinflation or monetary mismanagement
• Rule-based system removes political pressure from monetary decisions

Limitations of currency boards:

• The country cannot use monetary policy to fight recessions or respond to shocks that affect it differently than the reserve currency country (asymmetric shocks)
• Vulnerable to reserve depletion if confidence erodes or if the reserve currency itself shifts significantly in value

Effectiveness of Exchange Rate Arrangements

Several real-world examples illustrate how these systems work in practice.

Managed float examples:

• Singapore manages the Singapore dollar against a trade-weighted basket of currencies. The Monetary Authority of Singapore allows gradual appreciation over time as a tool to control imported inflation, rather than using interest rates as its primary policy lever.
• India uses the Reserve Bank of India to intervene in forex markets when the rupee experiences excessive short-term volatility, aiming for a stable but market-responsive rate.

Currency board examples:

• Hong Kong has maintained a currency board since 1983, pegging the Hong Kong dollar to the US dollar at roughly 7.80 HKD per 1 USD. This arrangement has survived multiple financial crises, backed by substantial foreign reserves.
• Bulgaria adopted a currency board in 1997 after a severe banking and currency crisis, pegging the lev first to the Deutsche Mark and later to the euro. The board helped restore monetary credibility after a period of hyperinflation.

Assessing effectiveness:

Managed floats work well when the central bank has strong credibility and sufficient reserves. They allow countries to absorb external shocks without abandoning market signals entirely. The risk is that half-measures can invite speculation if traders sense the central bank lacks the reserves or resolve to defend the band.

Currency boards excel at restoring trust in a currency, particularly after episodes of instability. However, they come at a real cost: when a country-specific recession hits, the government has no monetary policy tools to soften the blow. The economy must adjust through wages and prices instead, which can be slow and painful.