Why Exchange Rates Fluctuate
Unlike most assets, currencies are always traded in Pairs (e.g., EUR/USD). The value of one currency is only relative to another. Several macroeconomic factors drive these fluctuations:
- Interest Rates: Higher rates attract foreign capital, increasing the demand for that country's currency.
- Inflation: Countries with consistently lower inflation rates see their currency's purchasing power increase relative to others.
- Political Stability: "Safe haven" currencies like the USD, CHF, and JPY often rise during global geopolitical uncertainty.
- Trade Balances: A country that exports more than it imports has a higher demand for its currency to pay for those goods.
Avoid the "Zero-Fee" Marketing Trap
Many exchange kiosks at airports or digital transfer apps advertise "0% Commission" or "Zero Fees." This is almost always a marketing trick.
If the mid-market rate is 1 USD = 0.92 EUR, a "Zero Fee" company may only offer you 1 USD = 0.88 EUR. By giving you a worse rate, they are effectively charging you a 4% hidden fee while claiming to be "free."
Travel Exchange Tips
Always Pay in Local Currency
When an ATM or card terminal abroad asks if you want to be charged in your "Home Currency" or "Local Currency," always choose Local. Letting the terminal do the conversion usually incurs a massive 5-8% markup.
Use "No Foreign Fee" Credit Cards
Modern travel credit cards and fintech apps like Revolut or Wise use the Visa/Mastercard wholesale rate, which is the closest a consumer can get to the mid-market rate.
Avoid Airport Kiosks
Due to high rent and convenience, airport exchange booths have some of the worst spreads in the world. Use a local ATM at your destination instead.
What is Dynamic Currency Conversion (DCC)?
DCC is a process where the merchant's credit card processor performs the currency conversion at the point of sale. While it seems convenient to see the price in your home currency, the exchange rate is set by the merchant's bank, which is almost always significantly worse than your own bank's rate.