Specializing on the basis of marginal cost of production and trading allows both parties to consume more than their respective production sets would allow

Which of the following statements about markets and prices is correct?

A. In a market system, buyers and sellers must be in face-to-face contact with each other B. Prices affect the distribution of goods in a market system but not the allocation of resources C. In a market system, prices serve to ration goods and services to consumers D. The operation of a market system has little, if any, effect on the distribution of income in the economy

The source(s) of monopoly power for a monopoly may be:

A. economies of scope. B. patents. C. economies of scale. D. All of the statements associated with this question are correct.