# Consider an economy described by the following functions:- C = 20 + 0.80Y, I = 30, G = 50, TR = 100 (a) Find the equilibrium level of income and the autonomous expenditure multiplier in the model. - Economics

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Consider an economy described by the following functions:- C = 20 + 0.80Y, I = 30, G = 50, TR = 100 (a) Find the equilibrium level of income and the autonomous expenditure multiplier in the model. (b) If government expenditure increases by 30, what is the impact on equilibrium income? (c) If a lump-sum tax of 30 is added to pay for the increase in government purchases, how will equilibrium income change?

#### Solution

(a) C = 20 + 0.80 Y [barC=20]

I = 30

c = 0.80

G = 50

T = 100

Equilibrium level of income

Y=1/(1-c)[barC+cT+I+G]

=1/(1-0.80)[20+0.80xx100+30+50]

=1/0.20xx180=180/20xx100=900

Expenditure multiplier =1/(1-c)

=1/(1-0.80)=1/0.20=100/220=5

(b) Increase in government expenditure

ΔG = 30

New equilibrium expenditure

=1/(1-c)[barC+cT+I+G+DeltaG]

=1/(1-0.80)[20+0.80xx100+30+50+30]

=1/(1-0.80)[20+80+30+50+30]

=1/0.20xx210

=210/20xx100=1050

Equilibrium level of income increases by 150 (1050 − 900)

(c) Tax multiplier =(-c)/(1-c)

(DeltaY)/(DeltaT)=(-c)/(1-c)

So, DeltaY=(-c)/(1-c)xxDeltaT

=(-0.80)/(1-0.80)xx30

=(-0.80)/0.20xx30=-120

New Equilibrium level of income = Y + ΔY

= 900 + (−120)

= Rs 780

Is there an error in this question or solution?

#### APPEARS IN

NCERT Class 12 Economics - Introductory Macroeconomics
Chapter 5 Government Budget And The Economy
Exercise | Q 6 | Page 84