13) In empirical analyses of factors that help explain wages,
a.effort and ability are not likely to contribute to large differences in wages in the U.S.
economy.
b.economists typically find that measurable factors explain less than half of the
variation in wages.
c.economists typically find few factors that are not explicitly measurable.
d.unmeasurable influences on wage differences are found to be quite small.
14) Which of the following is a positive, as opposed to a normative, statement?
a.The US Department of Justice should allow a merger between AT&T and T-Mobile
because it would have little effect on consumers.
b.Antitrust laws should be used to prevent further concentration in the wireless
telephone service market.
c.The US Department of Justice sued AT&T to block its merger with T-Mobile.
d.The wireless telephone service market is too highly concentrated.
15) The highest form of competition is called
a.arbitrage.
b.monopolistic competition.
c.equilibrium.
d.perfect competition.
16) Marginal revenue can become negative for
a.both competitive and monopoly firms.
b.competitive firms but not for monopoly firms.
c.monopoly firms but not for competitive firms.
d.neither competitive nor monopoly firms.
17) Which of the following concepts cannot be illustrated by the production
possibilities frontier?
a.efficiency
b.opportunity cost
c.equality