Ec383 - Problem set 4
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Ec383 - Problem set 4
1. ModiÖed version of Box 5.4 in Perman et al:
Consider a dynamic model of stock pollution.
a. Write an expression in and that describes the steady state solution for a policy maker who wants to maximize
t=o
/B /Mt ( 一 D /At ((e-rt dt:
t=0
(b) Rewrite the expression in part (a) assuming the following:
- The pollution damage D, as a function of the level of concentration of the pollutant A, is given by
D/A( = :
The pollution beneÖts B as a function of the level of emissions M are B /M( = 2)M 一 M2 :
The decay rate a is ):5.
c. Find the steady state level of emissions M* and the steady state level of concentration A* for a r = ) and for r = ):1 for the solution of the policy makerís problem.
d. Are the expressions for M* and A* larger at r 5 ) or at r 5 ).1?
Provide an intuition for this result.
2023-01-31