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You are given the following data concerning Freedonia, a legendary country: Consumption Function: Investment: C 200 0.9Y 300

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Answer

a)

Y=200+0.9Y+300

Y-0.9Y=500

0.1Y=500

Y=5000

The equilibrium income is 5000

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b)

Investment multiplier =1/ (1-MPC)

MPC=coefficient of Y in the C function as it is the portion of income consumed for an extra dollar of income

MPC=0.9

Multiplier =1/ (1-0.9)

=10.0

c)

Change in Y=change in investment * multiplier

=10*10

=$100

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