If a country is an attractive place for foreigners to invest their funds, then that country will have a relatively high exchange rate. If it's an unattractive place, it will have a relatively low exchange rate. Those are the fundamentals that determine the exchange rate in a floating exchange rate system.
Milton FriedmanThe great virtue of a free market system is that it does not care what color people are; it does not care what their religion is; it only cares whether they can produce something you want to buy. It is the most effective system we have discovered to enable people who hate one another to deal with one another and help one another.
Milton Friedman