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Which of the following would decrease the marginal revenue product (MRP) of coal miners in the United States?

A

Congress passes quotas that limit the amount of coal that can be imported.

B

New technology increases the productivity of coal miners.

C

The United Mine Workers negotiates a new collective bargaining agreement that increases the wages of coal miners.

D

New environmental regulations decrease the demand for coal in the US.

E

Licensing requirements are implemented that limit the number of coal miners.

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