The regulation of natural monopolies is common in which of the following industries?

In a zero-sum game, ________

A) each player earns a zero payoff irrespective of the strategy one chooses B) each player has a dominant strategy C) each player chooses a pure strategy D) one player's loss is another player's gain

A monopoly is:

a. a seller of a highly advertised and differentiated product in a market with low barriers to entry in the long run. b. the only seller of a good for which there are no good substitutes in a market with high barriers to entry. c. the only buyer of a unique raw material. d. the producer of a product subsidized by the government.