The Price of Money
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An exchange rate is simply the price of one currency expressed in terms of another. If £1 buys $1.25, that's the pound-to-dollar exchange rate. Like any price, exchange rates move constantly — driven by trade flows, interest rate differentials, inflation expectations, investor sentiment, and geopolitical events.
Exchange rates matter far beyond international travel. They affect the price you pay for imported goods, the returns you earn on foreign investments, and the competitiveness of businesses operating across borders.
What Moves Exchange Rates?
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Interest rate differentials. Higher interest rates attract foreign capital seeking better returns. Investors buy the currency to access those rates, pushing the currency up. This is one reason central bank decisions ripple into currency markets almost immediately.
Inflation. A country with higher inflation sees its currency lose value over time relative to countries with lower inflation. Higher prices erode the real value of the currency.
Trade balances. When a country exports more than it imports, foreign buyers need its currency to pay for those goods — supporting demand for the currency. Persistent trade deficits can weaken a currency over time.
Risk sentiment. In times of global uncertainty, investors often flee to perceived "safe haven" currencies like the US dollar, Swiss franc, or Japanese yen — regardless of underlying economic fundamentals.
Fixed vs Floating Exchange Rates
Most major currencies float freely — their value is set by market forces. Some countries peg their currency to another (typically the US dollar), fixing the rate. Pegs reduce currency volatility and provide predictability for trade, but require central banks to hold large foreign currency reserves to defend the peg.
Why Exchange Rates Affect You
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If you hold foreign investments, exchange rate movements affect your returns when converted back to your home currency. A 10% gain in a US stock market is reduced if the dollar weakens 5% against your home currency. If you carry foreign currency debt or earn income in another currency, exchange rate risk becomes a direct financial concern.