Monetary policy, which involves changes in interest rates and the money supply by a central bank, influences a country’s current account by affecting exchange rates, capital flows, and domestic demand.

How interest rates affect the current account:

• Contractionary policy (higher interest rates) makes a country’s assets more attractive. This leads to capital inflows, causing the domestic currency to appreciate (gain value).
• A stronger currency makes exports more expensive and imports cheaper, which generally makes the current account worse.
• However, higher interest rates also lower domestic spending, which reduces the demand for imports and may help improve the current account.
• The net result depends on whether the competitiveness effect (worsening the balance) or the income effect (improving the balance) is stronger.

Effect under different exchange rate systems:

• Floating exchange rates: Higher interest rates typically lead to currency appreciation, which tends to reduce the trade balance. Lower interest rates lead to currency depreciation, which can improve the trade balance if export and import demand are sensitive enough.
• Fixed exchange rates: The central bank must prioritize keeping the currency value stable. They may raise interest rates to protect the currency peg rather than to manage the current account directly.

Key conflict:

Central banks often face a dilemma between internal balance (keeping inflation and unemployment low) and external balance (maintaining a healthy current account). For example, raising interest rates to fight inflation might unintentionally worsen the current account by strengthening the currency.