Use the Accompanying Graph, Which Depicts Mighty Max's Labor Demand

Multiple Choice

Use the accompanying graph, which depicts Mighty Max's labor demand for his duffle-bag business, to answer the questions that follow.

-Assume that the price of duffle bags is $10.If the marginal product of labor of the sixtieth worker drops by half,what is the value of the marginal product of labor of the sixtieth worker now?

A) $10
B) $15
C) $20
D) $25
E) $30