Refer to Figure 7-3. What is the value of revenue to foreign producers who are granted permission to sell in the U.S. market when there is a quota?

One of the major lessons learned in the chapter on experiments and quasi-experiments

A) is that there are almost no true experiments in economics and that quasi-experiments are a poor substitute. B) you should always use TSLS when estimating causal effects in quasi-experiments. C) populations are always homogeneous. D) is that the insights of experimental methods can be applied to quasi-experiments, in which special circumstances make it seem "as if" randomization has occurred.

To a firm facing constant input prices, increasing marginal returns

a. means that each additional unit of output costs more to produce than the previous unit b. means that the marginal product of the variable input decreases as more of the input is used c. can occur due to specialization and division of labor d. usually occur at very high rates of output e. can never occur