Central Bank Intervention in Fixed Rates Quiz: Maintaining Peg

Under a fixed exchange rate, the central bank acts as the enforcer of the official rate. When market supply and demand push the exchange rate away from the fixed level, the central bank steps in by buying or selling currency in the foreign exchange market to restore balance. Without this active intervention, the exchange rate would drift to its market-clearing level, undermining the fixed rate system.

The answer is True. If demand for the domestic currency pushes its value above the fixed rate, the central bank must increase supply to bring it back down. It does this by selling domestic currency in the foreign exchange market in exchange for foreign currency. The foreign currency received is added to the country's official reserves. This is why countries running persistent trade surpluses with fixed rates can accumulate very large reserve holdings over time.

To prevent the currency from falling below the fixed rate, the central bank buys domestic currency using its stock of foreign exchange reserves. Each intervention depletes the reserve holdings. If the downward pressure on the currency is sustained and the central bank must intervene repeatedly, reserves can fall to critically low levels, threatening the country's ability to meet international obligations and ultimately forcing a devaluation or abandonment of the peg.

A central bank defending a fixed rate has several tools. Higher interest rates attract foreign capital, increasing demand for the currency. Capital controls limit outflows that would otherwise weaken the currency. Direct market purchases using reserves increase demand for domestic currency. Allowing the currency to depreciate is the opposite of defending a fixed rate and would mean abandoning or adjusting the peg rather than maintaining it.

The answer is True. When a central bank intervenes in the foreign exchange market, it typically affects the domestic money supply. In sterilized intervention, the central bank offsets this effect by conducting an equal and opposite domestic open market operation. For example, if it buys foreign currency and increases the money supply, it may simultaneously sell domestic bonds to drain the same amount of money, neutralizing the monetary impact while still affecting the exchange rate.

Non-sterilized intervention allows the money supply to change, which affects interest rates and creates the economic incentives such as higher returns that help sustain the peg by attracting capital or reducing spending. Sterilized intervention avoids these spillover effects, which means the exchange rate must be held entirely by reserve spending rather than by supportive changes in monetary conditions. This makes sterilization a shorter-term holding measure rather than a structural defense.

Speculators attack a fixed rate by aggressively selling the domestic currency when they believe devaluation is likely. The central bank must spend reserves to buy the currency and defend the rate. If the attack is large and sustained, reserves can be exhausted quickly. When the market perceives that reserves are running low, more investors join the attack, creating a self-fulfilling crisis that can force devaluation even if the underlying fundamentals are sound.

The answer is False. The size of foreign exchange reserves is critical to the credibility and sustainability of a fixed rate defense. Small reserves can be quickly exhausted during a speculative attack or a sustained period of current account deficits. Once markets perceive that reserves are falling toward dangerously low levels, confidence in the peg collapses, speculative pressure intensifies, and the central bank may be forced to devalue or abandon the fixed rate regardless of its commitment.

When a central bank buys domestic currency to defend the peg, reserves fall, the domestic money supply contracts, and interest rates tend to rise as credit tightens. These are the direct balance sheet and monetary consequences of intervention. The trade balance does not automatically improve immediately following intervention because trade flows respond to price and income changes that take time to materialize.

A central bank may choose a controlled adjustment when defending the peg has become unsustainably costly. If reserves are nearly exhausted and the currency is significantly overvalued, the economic pain of maintaining the rate through austerity exceeds the cost of adjustment. A planned, orderly adjustment is generally less disruptive than a forced devaluation during a crisis, and can be accompanied by complementary measures to restore economic stability.

The answer is True. Purchasing Power Parity holds that exchange rates should in the long run reflect differences in price levels between countries. If the pegging country has persistently higher inflation than the anchor country, its goods become relatively more expensive over time, eroding competitiveness and creating downward pressure on the currency. To maintain the fixed rate against this erosion, the country must either reduce its inflation rate or face growing economic misalignment that makes the peg increasingly difficult to defend.

When a country raises domestic interest rates, it offers better returns on deposits and bonds denominated in its currency. Foreign investors move capital into the country to take advantage of these higher yields, which increases demand for the domestic currency in the foreign exchange market. This capital inflow reduces the downward pressure on the currency and helps the central bank maintain the fixed rate without having to spend as many reserves on direct market purchases.

Defending a peg during a crisis depletes reserves that protect against future shocks, forces interest rates higher to attract capital at significant economic cost, and tightens the money supply enough to trigger recession. These are the classic costs of crisis defense. A permanent reduction in long-term export competitiveness is not a direct consequence of intervention itself. Competitiveness is affected by relative price levels and productivity rather than by central bank market operations.

The impossible trinity states that a country can only achieve two of three policy goals at once. A fixed exchange rate with free capital flows requires the interest rate to match the anchor country, sacrificing monetary independence. A fixed rate with monetary independence requires capital controls to prevent flows from undermining the peg. Free capital with monetary independence requires a floating exchange rate. No country can have all three simultaneously, and this trade-off shapes exchange rate policy decisions worldwide.

The answer is False. Central bank intervention has real limits. If speculative pressure is large enough and reserves are insufficient, no amount of intervention can maintain the peg against a determined market. Historical currency crises in countries like Thailand in 1997 and the United Kingdom in 1992 demonstrated that even well-resourced central banks can be overwhelmed by the scale of coordinated speculative selling in modern global financial markets.