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All articlesHow Exchange Rates Work: Why One Currency Buys More Than Another
How exchange rates are set, what makes them move, the difference between the rate you see quoted and the rate you actually get, and how to avoid paying more than you need to.
An exchange rate is a price like any other: the price of one currency, quoted in another. When you read that EUR/USD is 1.09, it means one euro costs 1.09 dollars.
The confusing part is not the arithmetic. It's that there is no single rate, the one you see quoted is rarely the one you get, and the gap between them is where the cost hides.
Two ways rates are set
Floating. The rate moves continuously based on who wants to buy and sell the currency. The dollar, euro, yen and pound all float. No one sets the number; it is simply where trades are clearing right now.
Pegged. A country's central bank commits to holding its currency at, or near, a fixed rate against another — usually the dollar. Several Gulf currencies work this way. The bank defends the peg by buying and selling its own currency using its foreign reserves.
A peg is a policy, not a law of nature. It holds only as long as the central bank has the reserves and the will to defend it. Pegs that have looked immovable for years have broken in a single day, and when they break they move a long way at once.
What actually moves a floating rate
| Force | Effect on the currency |
|---|---|
| Higher interest rates | Tends to strengthen it — savers elsewhere want to hold it |
| Higher inflation | Tends to weaken it — each unit buys less at home |
| Trade balance | Exporting more than you import creates demand for your currency |
| Political stability | Uncertainty pushes money toward currencies seen as safer |
| Central bank action | Direct buying, selling, or simply signalling intent |
None of these operates alone, and they frequently pull in opposite directions. This is why confident short-term predictions about currency moves should be treated with suspicion — including from people who sound very sure.
The rate you see vs. the rate you get
This is the practical part, and it costs ordinary people real money.
The rate quoted on a search engine or a news site is the mid-market rate: the midpoint between what buyers are bidding and what sellers are asking. It is a reference number. Essentially no retail customer transacts at it.
What you are offered instead is a rate shifted in the provider's favour. That shift is the spread, and it is a fee — it is simply not labelled as one.
"Zero commission" and "no fees" very often mean the charge has moved into the exchange rate instead. A provider can advertise no fee while quoting you a rate 3% away from mid-market. Always compare the final amount received, in the destination currency, not the advertised fee.
How to check what you're really paying
It takes about a minute:
- Look up the mid-market rate for your pair.
- Take the exact amount the provider says will arrive.
- Divide it by the amount you're sending. That's your real rate.
- Compare it to the mid-market rate. The gap, as a percentage, is your true cost.
Do this once across two or three providers for the same transfer and the differences are usually much larger than people expect.
Where the biggest markups hide
- Airport and hotel exchange counters. Convenience priced accordingly.
- Card "dynamic currency conversion." When a foreign card terminal offers to charge you in your home currency, that is a markup being offered to you as a courtesy. Decline it; pay in the local currency and let your own bank convert.
- Weekend transfers. Some providers widen spreads when markets are closed to protect themselves against Monday's move.
- Small amounts. Fixed fees hurt disproportionately on small transfers; percentage spreads hurt more on large ones.
Why a weaker currency is not simply "bad"
A falling currency makes imports more expensive and foreign travel costlier for residents — but it makes that country's exports cheaper for everyone else, and its tourism better value. Governments sometimes tolerate, or quietly want, a weaker currency for exactly that reason.
For an individual, what matters is the direction relative to the currency your expenses are in. Someone earning in a weakening currency while paying for imported goods feels it immediately. Someone earning in a strengthening currency and spending locally may barely notice.
The short version
The rate is a price, set by supply and demand or by policy. What you are quoted is not what you get. The gap is the fee, whatever the marketing says — so compare the amount that lands, and nothing else.
This is general educational material, not financial advice. Currency regulations, capital controls and available services differ substantially by country; check the rules that apply where you live.