Answer:
Depreciation:devaluation.
Explanation:
Under a flexible exchange rate system a decline in the value of a currency relative to other currencies is a called a depreciation. This could be as a result of factors such as government monetary policies, varying interest rates, aversion of risks by investors, inflation etc.
On the other hand, under a fixed exchange rate system a decrease in the official value of a currency is called a devaluation. This is mainly due to the government monetary policy, so as to shore up the export of a country and to improve foreign trade.
