15. Consider a single competitive firm that starts off with zero capital in time 1. It's trying to decide how much capital to acquire in the next period, time 2. Like any real-world competitive firm, it's trying to maximize the net present value of its profits. It'll have to rent that capital from the market at price r>0 per unit of capital when time 2 arrives. We don't have to worry about depreciation-the rental rate is the only price we need to worry about. Output in time 2 is made this way: Y₂ = 2K₂a

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Chapter1: Making Economics Decisions
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15. Consider a single competitive firm that starts off with zero capital in time 1. It's trying to decide how
much capital to acquire in the next period, time 2. Like any real-world competitive firm, it's trying to
maximize the net present value of its profits.
It'll have to rent that capital from the market at price r>0 per unit of capital when time 2 arrives. We
don't have to worry about depreciation-the rental rate is the only price we need to worry about.
Output in time 2 is made this way:
Y2 = zK,
Where the exponent a is strictly between zero and one and z is strictly positive. This is an entirely
conventional firm net present value maximization problem.
a. Solve for the optimal level of time 2 capital solely as a function of exogenous parameters:
K2 =
b. What is the elasticity of optimal capital with respect to the interest rate? Answer as a function of
exogenous parameters:
elasticity =
c. In this model, is there such a thing as too much productivity? In other words, can the derivative
dK2 /dz be strictly negative in some cases, the way this model is set up?
Transcribed Image Text:15. Consider a single competitive firm that starts off with zero capital in time 1. It's trying to decide how much capital to acquire in the next period, time 2. Like any real-world competitive firm, it's trying to maximize the net present value of its profits. It'll have to rent that capital from the market at price r>0 per unit of capital when time 2 arrives. We don't have to worry about depreciation-the rental rate is the only price we need to worry about. Output in time 2 is made this way: Y2 = zK, Where the exponent a is strictly between zero and one and z is strictly positive. This is an entirely conventional firm net present value maximization problem. a. Solve for the optimal level of time 2 capital solely as a function of exogenous parameters: K2 = b. What is the elasticity of optimal capital with respect to the interest rate? Answer as a function of exogenous parameters: elasticity = c. In this model, is there such a thing as too much productivity? In other words, can the derivative dK2 /dz be strictly negative in some cases, the way this model is set up?
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