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The production function for a firm is Q = min(K, 4L), and the price per unit of

ID: 442546 • Letter: T

Question

The production function for a firm is Q = min(K, 4L), and the price per unit of capital is $40 and the price per unit of labor is $60.

a. What is the minimum cost of producing 20 units of output?

b. Using an isoquant and isocost line, illustrate the cost-minimizing input choice of the firm producing 20 units of output.

c. How would your answer to (a) change if the firm’s production function were instead given by Q= K + 4L?

d. Explain how the two production functions (initial and part c) differ conceptually? What do they imply about the way in which L and K are used?

Explanation / Answer

1.

Q = min(K, 4L)

It means that to produce 1 unit of output 1 unit of capital and ¼ unit of labor is reuired

Thus to produce 20 units of output minimum 20 units of capital and 20/4 =5 units of labor is required

Thus total minimum cost for 20 units of output =40*20+60*5=$1100

2.

Isocost line

TC=40K+60L

Isoquant line

Q=K+L/4

3.

Firm production function=K+4L

That is to produce1 unit of output, 1 unit of capital and 4 unit of labor is required

Thus to produce 20 units of output minimum 20 units of capital and 20*4=80 units of labor is required

Thus total minimum cost for 20 units of output =40*20+60*80=$5600

4.

The first production function says that to produce 1 unit of output, 1 unit of capital and ¼ unit of labor is required and the production function defined in 3 says that to produce 1 unit of output 1 unit of capital and 4 unit of labor is required