Why Exchange Rates Change Every Day
Exchange rates are prices
A currency exchange rate is simply the price of one currency expressed in another. EUR/USD at 1.08 means one euro buys 1.08 US dollars. Like any price, it's set by supply and demand — and it moves continuously as those forces shift.
The foreign exchange (forex) market is the largest financial market in the world, trading over $7 trillion per day. Unlike stock markets, it operates 24 hours a day, five days a week across global time zones.
What moves rates
Interest rates are the most powerful driver. When a central bank raises rates, its currency typically strengthens — higher rates attract foreign capital seeking better returns. The European Central Bank and US Federal Reserve rate decisions routinely cause significant EUR/USD moves.
Inflation erodes purchasing power. A country with high inflation tends to see its currency weaken over time, since each unit buys less. Central banks raise rates partly to control inflation — connecting the two factors.
Trade balances matter too. Countries that export more than they import tend to see stronger currencies, since foreign buyers must purchase local currency to pay for goods.
Political and economic stability affects confidence. Major elections, geopolitical events, or economic shocks cause traders to move money toward perceived safe havens — historically USD, CHF, and JPY during periods of uncertainty.
The bid-ask spread
When you exchange money at an airport or bank, you'll notice the rate they offer is worse than the "real" rate you see quoted online. The difference is the spread — the gap between the rate at which they buy and sell currency. It's how exchange services make money.
Online services and forex brokers typically offer tighter spreads, but most charge fees elsewhere. For large amounts, it's worth comparing the total cost including fees rather than just the headline rate.
Pegged vs. floating currencies
Most major currencies — EUR, USD, GBP, JPY, CHF — are free-floating: their rates are determined by the market. Some countries peg their currency to another (often the US dollar) to provide stability. Pegs can break under pressure, sometimes dramatically, as seen with the Swiss franc in 2015 when the SNB unexpectedly removed its EUR/CHF floor.
What this means for travellers and businesses
For travellers, short-term rate movements matter less than the spread and fees charged by your conversion method. A credit card with no foreign transaction fees often beats exchanging cash at a booth.
For businesses transacting across currencies, rate volatility is a real risk. Many hedge using forward contracts — locking in a rate today for a future transaction.
Live rates vs. mid-market
The rates shown in the Good Patrone Currency Converter come from the Frankfurter API, which provides daily European Central Bank reference rates. These are mid-market rates — the midpoint between buy and sell — and represent the "true" rate before any spread is applied. They're useful for reference and comparisons, not for calculating exactly what you'll receive at a bank or exchange counter.