The regulation of natural monopolies is common in all of the industries except the:

Which of the following provides the strongest evidence that the corporate form of business structure is relatively cost efficient in many industries?

a. the ability of the corporate business structure to compete effectively in most industries with other forms of business structure b. the fact that nearly three of every four businesses in the United States is an individual proprietorship c. the fact that economic theory indicates corporate managers have some leeway to pursue their own interests at the expense of greedy capitalists d. the ability of some corporate managers to achieve high salaries even though the firms they are directing are not earning economic profit

A positive externality or spillover benefit occurs when:

A. product differentiation increases the variety of products available to consumers. B. the benefits associated with a product exceed those accruing to people who consume it. C. a firm does not bear all of the costs of producing a good or service. D. firms earn positive economic profits.