21. A gasoline-conservation tax on the purchase of large automobiles, with the proceeds of the tax rebated to purchasers of small automobiles, is an example of
(A) a specific directive
(B) a market incentive modification
(C) an optimal resource allocation
(D) an alteration of a decision-making structure
(E) an external cost
22. If there were no external costs, as they are described in the passage, which of the following would be true?
(A) All technology-control methods would be effective.
(B) Some resource allocations would be illegal.
(C) Prices would include all costs to members of society.
(D) Some decision-making structures would be altered.
(E) The availability of common goods would increase.
23. The author assumes that, in determining what would be an optimal allocation of resources, it would be possible to
(A) assign monetary value to all damage resulting from the use of technology
(B) combine legal methods to yield theoretical optimum
(C) convince buyers to bear the burden of damage from technological developments
(D) predict the costs of new technological developments
(E) derive an equation making costs depend on prices
24. On the basis of the passage, it can be inferred that the author would agree with which of the following statements concerning technological development?
(A) The government should own technological operations.
(B) The effects of technological development cannot be controlled.
(C) Some technological developments are beneficial.
(D) The current states of technological development results in a good allocation of resources.
(E) Applications of technological development are criminally destructive.