Suppose that for a particular economy, investment is equal to 200, government purchases are 150, net taxes (that is lump-sum taxes minus transfers) is 100 and consumption is given by C = 100 + 0.75Y (a) What is the level of equilibrium income? (b) Calculate the value of the government expenditure multiplier and the tax multiplier. (c) If government expenditure increases by 200, find the change in equilibrium income.

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Solution

I = 200

G = 150

T = 100

C = 100 + 0.75 Y

So, C (Autonomous consumption) = 100

And, MPC (c) = 0.75

(a) Equilibrium level of income

(b) Government expenditure multiplier

= 4

Tax multiplier

= −3

(c) ΔG = 200

New equilibrium income

Therefore, change in equilibrium income = 2300 − 1500 = Rs 800

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I = 200 G = 150 T = 100 C = 100 + 0.75 Y So, C (Autonomous consumption) = 100 And, MPC (c) = 0.75 (a) Equilibrium level of income (b) Government expenditure multiplier = 4 Tax multiplier = −3 (c) ΔG = 200 New equilibrium income Therefore, change in equilibrium income = 2300 − 1500 = Rs 800