: Why are some countries' currencies "weaker"? Why for example, is the Japanese Yen trading very weakly (historically)? The exchange rate between the US Dollar and Japanese Yen is 1:79.791125 but the exchange rate between the

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1:30 is not stronger than 1:79. These are just numbers.

Trading 1:120 in 2008 and 1:79 now vs. trading 1:31 in 2008 vs 1:30 now is much better criteria to look at to evaluate the strength of the currency, and if you look at that you can see that the Japanese Yen is significantly stronger than the Bhat.

While Yen gained 25% to its worth, Bhat gained nothing over the same period of time. You can also see that the Yen was very consistent, while Bhat was volatile over that period.

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You may as well ask why a piece of wood is 25 centimeters long but only 10 inches. Most units of measure are very arbitrary. Somebody decides that this amount of heat or distance or money is a convenient unit, and so that's what they use.

Suppose that tomorrow the government issued a whole new currency that had 10 times the value of the old currency. So if you used to make 10,000 foobars a year, now you make 1,000 new foobars. And likewise the price of everything you buy is divided by 10. If a certain model car used to cost 2,000 foobars, now it costs 200 new foobars. Are you better or worse off? Clearly if ALL prices change by the same percentage, then it makes absolutely no difference. (Aside from the hassle of making the switch and getting used to the new numbers.)

A currency where 1 unit of money buys more is not necessarily a "stronger currency". Any more than inches are "better" than centimeters because you get more wood for an inch than you get for a centimeter. A currency is said to be "strong" when it's value is stable or increasing relative to other currencies. If yesterday I could trade 10 foobars for 1 plugh, but today I only need 9 foobars to buy 1 plugh, then foobars are stronger than plughs. Even though I still need more foobars than plughs to buy the same item.

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The answer from littleadv perfectly explains that the mere exchange ratio doesn't say anything.

Still it might be worth adding why some currencies are "weak" and some "strong".

Here's the reason: To buy goods of a certain country, you have to exchange your money for currency of that country, especially when you want to buy treasuries of stocks from that country. So, if you feel that, for example, Japanese stocks are going to pick up soon, you will exchange dollars for yen so you can buy Japanese stocks. By the laws of supply and demand, this drives up the price. In contrast, if investors lose faith in a country and withdraw their funds, they will seek their luck elsewhere and thus they increase the supply of that currency. This happened most dramatically in recent time with the Icelandic Krona.