A firm’s short-run production function shows the relationship between the firm’s input and output. Assume the firm uses one variable input, labor, and one fixed input, capital. The following table shows short-run production function for a firm that produces widgets. Quantity of Labor Total Product
0 0
1 6
2 14
3 24
4 32
5 39
6 42
(a) Calculate the marginal product of the sixth worker. Show your work.

(b) Does the production function exhibit diminishing returns to labor? Explain.

(c) When marginal product is falling, what happens to marginal cost?

(d) On a single correctly labeled graph, draw the firm’s short-run average total cost curve (ATC), average variable cost curve (AVC), and marginal cost curve (MC).