In the above figure of a monopolistically competitive firm, the area of economic profit is

"Higher ethanol production definitely and directly raises the price of corn," said USDA economist Ephraim Leibtag. In the short run, what is TRUE if the production of ethanol increases?

A) The demand for corn will increase. B) The supply of ethanol will decrease. C) The supply of corn will increase. D) The demand for ethanol will increase.

A monopolist's demand curve is

a. its marginal cost curve b. its marginal revenue curve c. identical to the market demand curve d. the same as the demand curve of a firm in perfect competition e. nonexistent