# Autonomous Spending

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2. (A Change in Autonomous Spending) Suppose that when aggregate output equals zero, consumption equals $100 billion, autonomous investment equals $200 billion, government purchases equal $50 billion, and net exports equal $50 billion. Suppose also that MPC is 0.9 and MPM is 0.1.

a) Construct a table showing the level of aggregate spending, net exports, and saving plus net taxes for aggregate output levels of zero, $500 billion, and $1,000 billion.

b) Use autonomous spending and the multiplier to calculate the equilibrium level of real GDP demanded.

c) What would be the new level of real GDP demanded if an increase in the U.S. interest rate caused net exports to change by $50 billion? Explain.

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#### Solution Preview

Different books sometimes choose to model the variables in this question in slightly different ways. I'll use the most common one here and explain it as clearly as possible so that you will be able to adjust the calculations if in your class you use different models/formulae.

I'll assume here that the consumption function has the form:

C = Co + MPC*Y

where Y is aggregate output and Ca is autonomous spending.

I will assume the investment and government purchases to be fixed for any value of aggregate output:

I = Io

G = Go

(notice that they are fixed in that neither of them depends on Y)

Finally, I'll assume that the net exports follow this formula:

NX = X - M = Xo - MPM*Y

where Xo is the exports level (which is fixed; i.e. doesn't depend on Y).

Now, in order to answer question 1 we must find all the formulae. Let's start ...

#### Solution Summary

Please calculate the equilibrium level of real GDP demanded.