The Demand and Supply Curves Shown Below Apply to a Competitive

Multiple Choice

The demand and supply curves shown below apply to a competitive market for a factor used in the production of widgets. FIGURE 13-2
-Refer to Figure 13-2.This factor market is in equilibrium at point B.What is the marginal revenue product of the 40th unit of the factor employed?

A) $8 multiplied by the price of the product
B) $320
C) $8
D) the marginal product of the 40th unit employed multiplied by the wage
E) $8 multiplied by the marginal revenue of the 40th unit employed