Euro is the European standard money, you can use it in all the countries in the European Union.

A common universal currency is certainly desirable but may not materialize in the near future. There could be several reasons for this, not the least being national prestige! A good example of a regional attempt to have a common currency is the Euro.

The currency of Taiwan is NTD (New Taiwan Dollar).

we could make all countries currency called a “dollar” but I’m sure the USA would have just as much trouble with changing their currency to the “yen” or “pound” as Japan and the UK…

so since every country has different ways of handling money, and different names and systems for how much a what is worth, we need to trade one of this countries money for one of those, making different currency values which are almost constantly changing.

it’s about language, it’s about culture, it’s about governmental decisions (like some european countries use one currency “the euro” so the countries that have that currency stablise the value of the Euro for those where it would otherwise be worth less or more).