When you look at these foreign currencies, you may wonder which is more expensive— the Pound or the Euro. Actually, there’s a fun story about the world’s most expensive currency. It’s not just the Euro and the Pound.

In fact, the Kuwaiti dinar (KWD) can be exchanged for as much as 3.26 dollars per unit—extremely expensive—because Kuwait is the 10th-largest oil exporter in the world. Next comes the Bahraini dinar (2.65 dollars) and the Omani rial (2.60 dollars), which are also only 1.33 dollars more expensive than the Pound (GBP). Meanwhile, the Euro (EUR) is even lower by 1.13 dollars.

If you compare them, the Pound is 18% more expensive than the Euro. But neither one is at the very top. The Pound is an old currency of England, used since the Anglo-Saxon era. The Euro only came into use in 1999, but it’s used in 20 countries, which gives it a considerable influence on the global economy.

In short, the world’s most expensive currencies mostly come from wealthy oil-exporting countries. But when it comes to the Pound and the Euro, these are currencies of major economic powers. The Pound is a bit more expensive, but the Euro has more users. It all depends on who holds them.