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How Currency Exchange Rates Work
Currency exchange rates represent the price of one currency in terms of another. They fluctuate constantly based on supply and demand, influenced by factors like interest rates, inflation, political stability, economic performance, and trade balances. The foreign exchange (forex) market is the largest financial market in the world, with over $7.5 trillion traded daily. Exchange rates can be quoted as direct (domestic per foreign) or indirect (foreign per domestic).
Fixed vs Floating Exchange Rates
Most major currencies use floating exchange rates, determined by market forces. Some currencies are pegged (fixed) to another currency — the UAE Dirham and Saudi Riyal are pegged to the US Dollar. China manages a "managed float" for the Yuan. Fixed rates provide stability but limit monetary policy flexibility. Floating rates adjust to economic conditions but can be volatile, creating uncertainty for international trade.
Understanding Bid/Ask Spread
When you exchange currency, you'll notice two rates: the bid (what buyers pay) and the ask (what sellers charge). The difference is the spread — the exchange service's profit. Banks and airports typically have wider spreads (3-10%), meaning worse rates for consumers. Online services like Wise and Revolut offer rates closer to the mid-market rate with transparent, lower fees.
Major Currency Pairs
In forex trading, currencies are always quoted in pairs. The most traded pairs are EUR/USD (Euro/Dollar), USD/JPY (Dollar/Yen), GBP/USD (Pound/Dollar), and USD/CHF (Dollar/Swiss Franc). These "major pairs" account for the majority of forex trading volume and typically have the tightest spreads. Pairs involving smaller currencies are called "exotic pairs" and have wider spreads.
Getting the Best Exchange Rate
To get the best rate when traveling or sending money internationally, avoid airport exchanges (worst rates). Use online services like Wise, Revolut, or OFX for international transfers. When traveling, use a credit card with no foreign transaction fees. Withdraw cash from ATMs abroad using a debit card with low international fees. Always choose to pay in the local currency — "dynamic currency conversion" at points of sale almost always offers worse rates.