A monetary expansion shits the LM curve to the LMO, with ISO the equilibrium moves from point 1 to point 4. At point 3 the interest rate is lower causing the exchange rate to depreciate. The central bankattempts to maintain the exchange rate at the waist by selling foreign currency (buying domestic currency). The intervention of central bank reduces the money supply, the LM curve returns to its original position at point1. Under a fixed exchange rate regime monetary policy has no effect on output.
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