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Question

Find equilibrium Y when C = 100 + 0.5Y and I = 1,000.


A

2,200

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B

4,500

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C

2,000

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D

733.33

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Solution

The correct option is A

2,200


Equilibrium is struck when:

AS = AD

Or, when Y = C + I

Substituting the values of C and I, we get :

Y = 100 + 0.5Y + 1,000

Or Y - 0.5Y = 100 + 1,000

Or, 0.5Y = 1,100

Y=1,1000.5=2,200.


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