I have a Canadian friend who makes his living exporting stuff to the USA. He used to whine when we travelled because our dollar bought more pesos than his, but now he's unhappy that our weak dollar hurts his export business.

Part of the issue is simple semantics. There is absolutely zero reason why our dollar and theirs should have the same value. If they called theirs a fukwad no one would expect them to be equal.

The strength of a countries currency reflects many economic issues as well as political. The Chinese have long kept their currency undervalued to help with exports. It seems to have worked.