# 經濟問題求解??(急..20點)

you are given the following information about the economy of Zeeland:

Autonomous consumption expenditure is $100 billion,and the marginal propensity

to consume is 0.8. Investment is $560 billion ,government purchases of goods

and services are $400 billion,and the net taxes are a constant $400 billion.

a. what is the consumption function?

b.what is the equation that describes the aggregate expenditure?

c.calculate equilibrium expenditure.

d.if investment falls to $360 billion,what is the change in equilibrium expenditure and what is the size of the multiplier?

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給我一點想法也可..拜託Orz

### 1 Answer

- Anonymous1 decade agoBest Answer
C=100+0.8Yd, I=560, G=400, T=400, Yd=Y-T=Y-400

a. C=100+0.8Yd

b. AE=100+0.8Yd+560+400

c. at equilibrim Y=AE:

therefore, Y=100+0.8(Y-400)+560+400=>Y=AE=3700 (請自行檢查)

d. Y=100+0.8(Y-400)+360+400=>Y=AE=2700

multiplier=1/(1-MPC)=5