Final answer:
A flexible exchange rate is determined by market demand and supply without central bank intervention.
Step-by-step explanation:
A flexible exchange rate is one that is determined by demand and supply in the foreign exchange market with no direct intervention by the central bank. Countries that opt for a floating exchange rate policy allow the foreign exchange market to set their currency's value. This is distinct from other forms of exchange rate policies, such as a soft peg, where the government may intervene in the exchange rate market if there are significant fluctuations, or a hard peg, where the government sets a fixed exchange rate.