According to economic liberalism, the regulating force of the economy is

Public companies ________ and private companies ________

A) sell stock in financial markets; also sell stock in financial markets B) sell stock in financial markets; do not sell stock in financial markets C) do not sell stock in financial markets; sell stock in financial markets D) do not sell stock in financial markets; also do not sell stock in financial markets

When a single firm can produce output over the relevant range of demand more efficiently than two or more firms can, because of the existence of economies of scale, we have: a. perfect competition

b. monopolistic competition. c. diseconomies of scale. d. a natural monopoly.