3. Consider a dynamic (two-period) representative firm's problem. This representative firm is given K unit of capital to produce in the current period. Firm can choose (current-period and future-period) labor demands and investment (to adjust future- period's capital stock) to maximize its present-value lifetime profit. Given that the market interest rate is r and the capital depreciation rate is & after production in each period. Let's further assume that this firm sells all the capital after future-period production. (a) Clearly definite the profit functions for both periods and write down this repre- sentative firm's problem. (b) Write down the optimal condition on investment. Intuitively explain the optimal condition. (c) Suppose K increases, graph the change of investment curve. Intuitively explain the changes on the graph you just drew.

ENGR.ECONOMIC ANALYSIS
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ISBN:9780190931919
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Chapter1: Making Economics Decisions
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3. Consider a dynamic (two-period) representative firm's problem. This representative
firm is given K unit of capital to produce in the current period. Firm can choose
(current-period and future-period) labor demands and investment (to adjust future-
period's capital stock) to maximize its present-value lifetime profit. Given that the
market interest rate is r and the capital depreciation rate is & after production in each
period. Let's further assume that this firm sells all the capital after future-period
production.
(a) Clearly definite the profit functions for both periods and write down this repre-
sentative firm's problem.
(b) Write down the optimal condition on investment. Intuitively explain the optimal
condition.
(c) Suppose K increases, graph the change of investment curve. Intuitively explain
the changes on the graph you just drew.
Transcribed Image Text:3. Consider a dynamic (two-period) representative firm's problem. This representative firm is given K unit of capital to produce in the current period. Firm can choose (current-period and future-period) labor demands and investment (to adjust future- period's capital stock) to maximize its present-value lifetime profit. Given that the market interest rate is r and the capital depreciation rate is & after production in each period. Let's further assume that this firm sells all the capital after future-period production. (a) Clearly definite the profit functions for both periods and write down this repre- sentative firm's problem. (b) Write down the optimal condition on investment. Intuitively explain the optimal condition. (c) Suppose K increases, graph the change of investment curve. Intuitively explain the changes on the graph you just drew.
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