In an economy the autonomus investment is 100 n C=80+0.4Y . Is the economy in eqilibrium at an income level 400?

Dear Student,

First of all let us note down the value provided in the question:
I = 100
Now as we know, at equilibrium level

Y = AD,
or, Y = C + I
Substituing the values in the above equationY = 80 + 0.4Y + 100Y = 180 + 0.4Y0.6Y = 180Y = 1800.6 = 300

Thus, economy will be in equilibrium level at a income of Rs 300 and not Rs 400.

Hope this answers your query.
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