If the _______ differ between two countries, this suggests the possibility for mutually advantageous trade.
A) opportunity costs
B) marginal costs
C) absolute costs
D) fixed costs
Answer: A) opportunity costs
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A change in the level of an economic activity is desirable and should be undertaken as long as the marginal benefits exceed the ____
a. marginal returns b. total costs c. marginal costs d. average costs e. average benefits
Natural monopolies are firms that
a. have a downward-sloping long-run average cost curve over the entire range of market demand b. have an upward-sloping long-run average cost curve over the entire range of market demand c. are protected against the entry of new firms by patents, licenses, or other legal restrictions d. control a nonreproducible resource that is critical to production e. have been created over time by the mergers of many smaller firms