The additional money a business gets from producing and selling one more unit of output is

A tendency for a good to come into favor with consumers because other consumers have chosen to buy the item is

A) price-leadership. B) negative-sum game. C) positive market feedback. D) negative market feedback.

To be a natural monopoly, a firm must

A) control a key resource input. B) have economies of scale that are so large that it can supply the entire market at a lower cost than two or more firms. C) have significant network externalities. D) be in a government-regulated market.