Forests in the United States, starting from the time the colonists arrived,
a. have always expanded.
b. have only shrunk in size.
c. have changed little.
d. shrank as they were logged and cleared for farms, then rebounded, especially in the twentieth century.
D
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Academic book publishers hire editors, designers, and production and marketing managers who help prepare books for publication. Because these employees work on several books simultaneously, the number of people the company hires will not go up and down
with the quantity of books the company publishes during any particular year. The salaries and benefits of people in these job categories will be included in A) fixed cost and marginal cost but not variable cost. B) fixed cost but not variable cost and total cost. C) marginal cost and total cost but not fixed cost. D) fixed cost and total cost but not variable cost.
As pollution emission levels increase, the marginal social benefit of pollution
A. becomes infinite. B. does not change. C. increases. D. decreases.