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Answer to Question #51592 in Macroeconomics for ALEXANDER M

Question #51592
An open macroeconomic model for a hypothetical economy is represented as follows

Y= C0 +Io+Go+X0-M, M=mo+m1yd,C=co+c1yd, T=tY and Yd=Y-T

Show that equal change in tax and government expenditure are expansionary to the economy
Derive the equilibrium level of savings in the economy above
Derive the investment multiplier

b) Using appropriate model, illustrate the effect of an expansionary fiscal policy in an open economy operating in free exchange rate regime .Assume perfect capital mobility. What is the effect if the government uses monetary policy alternatively?

c. The full effect of fiscal policy may not be realized if not matched with changes in monetary policy, explain using the IS/LM model
Expert's answer
The equal change in tax and government expenditure are expansionary for the economy, because if the government expenditure increases (Go to G1), the GDP will increase too, as Y= C0 +Io+Go+X0-M. So, the equal change in tax and government expenditure will have expansionary effect.
In the equilibrium savings are equal to investment, so in our case the equilibrium level of savings is S = Io.
Investment multiplier is simply the multiplier effect of an injection of investment into an economy. 
The investment multiplier in our case will be mi = 1/(1 - c) = 1/(1 - c1).

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