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# Answer to Question #63611 in Macroeconomics for Anna

Question #63611
Assume perfect capital mobility and fixed exchange rates. Furthermore, assume that no changes in the nominal exchange rate are expected and that there are no risk premia. The economy in characterized as follows: LM curve: i = 0.5Y - 0.1 M/P, IS curve i = -Y + R + 100, nominal exchange rate E = 7.5, price level P = 2, world interest rate i^W = 5.5, world price level P^W= 2. Calculate the change in Y if the price level changes from P_0=2 to P_1=1.
1
2016-11-25T09:49:15-0500
LM curve: i = 0.5Y - 0.1 M/P, IS curve i = -Y + R + 100, nominal exchange rate E = 7.5, price level P = 2, world interest rate i^W = 5.5, world price level P^W= 2.
In equilibrum LM = IS, so:
0.5Y - 0.1 M/P = -Y + R + 100,
1.5Y = R + 0.1 M/P + 100
Y = (R + 0.1 M/P + 100)/1.5
The change in Y if the price level changes from P_0 = 2 to P_1 = 1 is:
Y1 - Y0 = (R + 0.1 M/1 + 100)/1.5 - (R + 0.1 M/2 + 100)/1.5 = 0.05M.

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