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Why are some countries' currencies “weaker”? 
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.