In marginal cost pricing, the natural monopoly would have to set price equal to

According to opportunity-cost theory, if more people learned how to repair their own automobiles, the wages of automotive mechanics would

A) decline as the highest-cost mechanics left the business. B) decline, because the marginal quality of the services provided would go down. C) not change because no change has occurred in demand or supply. D) rise, because mechanics would have to obtain more per hour to maintain their incomes. E) rise in order to compensate for the smaller demand.

The law of demand implies that:

A) consumers are not responsive to price changes. B) consumers will, all other things unchanged, buy more at lower prices. C) sellers will, all other things unchanged, offer more on the market at higher prices. D) sellers will, all other things unchanged, offer less on the market at lower prices.