Suppose that the first four units of a variable input generate corresponding total outputs per period of 200, 350, 450, and 500, respectively. The marginal product of the second unit of input is:.

150

Explanation:

The marginal product refers to the additional output generated by using one extra unit of input in the production process:

units of input      total output                 marginal product

1                                 200                        200 (= 200 - 0)

2                                350                         150 (= 350 - 200)

3                                450                         100 (= 450 - 350)

4                                500                          50 (= 500 - 450)