题目内容

Total surplus is the sum of consumer surplus and producer surplus.

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Trade allows each person to specialize in the activities he or she does best, thus increasing each individual's productivity.

Suppose the most you would be willing to pay for a plane ticket home is $250, but you buy one online for $175. The consumer surplus of buying the online ticket is ( ).

A. $175.
B. $250.
C. $75.
D. $0.

Like competitive firms, monopolies choose to produce a quantity in which marginal revenue equals marginal cost.

Copyrights and patents are examples of barriers to entry that afford firms monopoly pricing powers.