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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