Determine whether the examples describe fixed exchange rate systems, flexible $($or floating$)$ exchange rate systems, or neither. Consider each example based only on the information given.

a$.$ In exchange rate system, the government determines how many units of its currency can be exchanged for another country's currency, using macroeconomic policy to maintain it$.$

b$.$ The importance of monetary policy increases under exchange rate system, which reinforces the objectives of monetary policy's.

c$.$ Today, the values of most world currencies are determined by market forces, but governments occasionally intervene to manage their currencies' values. Today's system could best be described as exchange rate system.

d$.$ In exchange rate system, expansionary fiscal policy is reinforced, as higher interest rates lead to capital inflows.

e$.$ Supply and demand in the foreign exchange market determine the exchange rates between countries using exchange rate system.

f$.$ The demand for dollars increases, but one Turkish lira still exchanges for $$0\mathrm{.}49.$ Turkey operates under exchange rate system.