3. The response of tnvestment to fiscal policy
a) Using the IS-La diagram, show the elects on output and
the interest rate or a decrease in government spending.
Can you tell what happens to investment. why:
Now consider the following IS-LM modes
C=
I=
MiP =
b. Solve for equilibrium output Assume +
,
< I. (Hint
You may want to re-work through Problem 2 If you are
having trouble with this step.)
c. Solve for the equilibrium interest rate. (Flint: Use the
LM
relation.?
d. Solve tor investment.
e. Under what conditions on the parameters of the model
(LE-, Co, C,, and so on) will Investment Increase when G de-
creases? (Hint: If G decreases by one unit, by how much
does I increase? Be careful; you want the change in / to De
positive when the change in G is negative.)
f.. Explain the condition you derived in part (e).