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When firms expand and experience specialization, the long-run average cost curve is Select one: a. vertical O b. horizontal O c. Decreasing d. increasing If an airport decides to expand by building an additional passenger terminal, and as a result average cost per airplane landing increases, then the expansion would provide to the airlines Select one: a. diseconomies of scale O b. economies of scale O c. higher marginal costs but lower total costs O d. lower average costs but higher total costs Rent control is an example of Select one: O a. a price floor. O b. a price ceiling. O c. a subsidy for low-skilled workers. O d. a black market