Why do countries need exchange rates for international trade? A. Exchange rates ensure that prices are set by supply and

Why do countries need exchange rates for international trade?
A.
Exchange rates ensure that prices are set by supply and demand.
B.
Exchange rates ensure that the price of goods stays the same over time.
C.
Exchange rates ensure that each country receives equal trade opportunities.
D.
Exchange rates ensure that countries can fairly trade goods for currency.

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