Q17 of 25 Page 1

Estimate the value of Aggregate Demand in an economy if:

a) Autonomous Investment (I) = Rs. 100 Crore.


b) Marginal Propensity to Save (MPS) = 0.2


c) Level of Income (Y) = Rs. 4,000 crores.


d) Autonomous Consumption Expenditure (c) = Rs. 50 Crore


OR


In an economy, C= 200+ 0.5 Y is the consumption function where C is the consumption expenditure and Y is the national income. Investment expenditure is Rs. 400 crores. Is the economy in equilibrium at an income level Rs. 1500 crores? Justify your answer.

Aggregate Demand (AD) = Consumption Expenditure (C) + Investment (I)


= C+I


C=c +bY


Where, c= Autonomous Consumption Expenditure =50


b= Marginal Propensity to Consume (MPC) =1-MPS


= 1-0.2 = 0.8


Y= 4000


C= 50+0.8*4000


= 50+3200 = 3250


AD= C+I


C=3250


I=100


= 3250+100


= 3350.


Aggregate demand is 3350.


OR


At equilibrium Y=C+I


Where C =200+0.5Y


I = 400


Therefore,


Y= C+I


= (200+0.5Y) +400


Y= 200+0.5Y + 400


Y-0.5Y = 400+200


0.5Y = 600


Y= 600/0.5


=1200.


Therefore the equilibrium level of income is 1200, then the economy will not be at equilibrium at 1500 level of income.


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