Essentials of Economics 7th Edition by Gregory Mankiw

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The deadweight loss from monopoly arises because
A) the monopoly firm makes higher profits than a competitive firm would.
B) some potential consumers who forgo buying the good value it more than its marginal cost.
C) consumers who buy the good have to pay more than marginal cost, reducing their consumer surplus.
D) the monopoly firm chooses a quantity that fails to equate price and average revenue.