What happens to a floating currency when capital flows out of the country?

• →A floating exchange rate is one determined entirely by market forces of supply and demand, without government intervention to fix or manage its value.
• →When capital flows out of a country e.g. when foreign investors withdraw funds from UK financial markets, those investors must sell pounds in order to purchase foreign currency.
• →This increases the supply of pounds on the foreign exchange market while simultaneously reducing demand for them. This means that, following the law of supply and demand, the price of the pound (its exchange rate) will fall.
• →As a result, each pound buys fewer units of foreign currency. For instance, if the UK's interest rates are cut and investors move capital to higher-yielding economies such as the United States, the outflow of capital raises the supply of sterling significantly.
• →Therefore, the pound depreciates against currencies such as the US dollar and the euro. - A depreciation makes UK exports cheaper in foreign markets and imports more expensive for domestic consumers, which has broader consequences for inflation and the current account balance.

Currency Depreciation Diagram — shows how a fall in the exchange rate affects the price of exports and imports. Open full diagram →

• →Supply and demand in the foreign exchange market: A currency's exchange rate under a floating system is set where supply equals demand. Capital outflows increase the supply of domestic currency, shifting the supply curve rightward and lowering the equilibrium exchange rate.
• →The link between interest rates and capital flows: Lower domestic interest rates reduce the return on assets held in that currency, making them less attractive to international investors. This triggers capital outflows, increasing currency supply and causing depreciation.
• →Hot money flows: Short-term speculative capital — often called hot money — is highly sensitive to interest rate differentials between countries. Even the expectation of a rate cut can trigger outflows and immediate currency depreciation.
• →Depreciation versus devaluation: Depreciation describes a fall in a floating exchange rate driven by market forces. Devaluation refers specifically to a deliberate government or central bank decision to lower a fixed exchange rate. These terms are not interchangeable.
• →Consequences of depreciation: A weaker currency raises import prices (potentially increasing inflation) and lowers export prices for foreign buyers (potentially improving export competitiveness), so depreciation is not inherently harmful or beneficial — context determines the net effect.

This question assesses understanding of the determination of floating exchange rates and the transmission mechanism through which capital movements affect currency values. It requires students to demonstrate how changes in financial conditions — particularly interest rates — alter the behaviour of international investors, shift currency supply and demand, and ultimately change the exchange rate. This falls under Edexcel spec point 4.1.8.d, which covers the causes of changes in exchange rates. Students are expected to construct a coherent chain of reasoning from an initial change in conditions (such as a fall in interest rates or a capital outflow) through the foreign exchange market mechanism to the resulting movement in the exchange rate.

Examined 3 times across Edexcel since 2017.

The topic has appeared on both Paper 2 and Paper 3, and at both single-mark multiple-choice level and extended five-mark level, indicating that examiners test both recognition and reasoned explanation of the mechanism.

• →International Economics — understanding the trading context is essential because exchange rate movements directly affect the price competitiveness of exports and imports, linking exchange rate causes to their real-economy consequences.