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How does the currency between countries relate
Firstly currency prices, like any asset, depend on supply and demand. Meaning how many people want to exchange a currency to another one vs. wanting to buy that currency using another currency. Secondly, it really depends on which country and economy you are talking about. In emerging economies, currencies are very often influenced by the politics of that country. In cases like the US, there are a myriad reasons. The USD is mostly governed by psychology (flight to safety) and asset purchases/sales. In theory, currencies balance, given the inflation of a country and its trade with other countries. e.g. Germany, which was always exporting more than it was importing, had the problem of a rising currency. (Which would make its exports more expensive on foreign markets. This is the balancing act.)