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  3. In the competitive model—the economy of many sellers each with a small share of the total market—the restraint on the private ex

In the competitive model—the economy of many sellers each with a small share of the total market—the restraint on the private ex

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问题     In the competitive model—the economy of many sellers each with a small share of the total market—the restraint on the private exercise of economic power was provided by other firms on the same side of the market. It was the eagerness of competitors to sell, not the complaints of buyers, that saved the latter from spoliation. It was assumed, no doubt accurately, that the nineteenth-century textile manufacturer who overcharged for his product would promptly lose his market to another manufacturer who did not. If all manufacturers found themselves in a position where they could exploit a strong demand, and mark up their prices accordingly, there would soon be an inflow of new competitors. The resulting increase in supply would bring prices and profits back to normal.
    As with the seller who was tempted to use his economic power against the customer, so with the buyer who was tempted to use it against his labor or suppliers, the man who paid less than the prevailing wage would lose his labor force to those who paid the worker his full(marginal)contribution to the earnings of the firm. In all cases the incentive to socially desirable behavior was provided by the competitor. It was to the same side of the market—the restraint of sellers by other sellers and of buyers by other buyers, in other words to competition—that economists came to look for the self-regulatory mechanisms of the economy.
    They also came to look to competition exclusively and in formal theory still do. The notion that there might be another regulatory mechanism in the economy had been almost completely excluded from economic thought. Thus, with the widespread disappearance of competition in its classical form and its replacement by the small group of firms if not in overt, at least in conventional or tacit, collusion, it was easy to suppose that since competition had disappeared, all effective restraint on private power had disappeared. Indeed, this conclusion was all but inevitable if no search was made for other restraints, and so complete was the preoccupation with competition that none was made.
    In fact, new restraints on private power did appear to replace competition. They were nurtured by the same process of concentration which impaired or destroyed competition. But they appeared not on the same side of the market but on the opposite side, not with competitors but with customers or suppliers. It will be convenient to have a name for this counterpart of competition and I shall call it countervailing power.
    To begin with a broad and somewhat too dogmatically stated proposition, private economic power is held in check by the countervailing power of those who are subject to it. The first begets the second. The long trend toward concentration of industrial enterprise in the hands of a relatively few firms has brought into existence not only strong sellers, as economists have supposed, but also strong buyers, a fact they have failed to see. The two develop together, not in precise step, but in such manner that there can be no doubt that the one is in response to the other.
Economists didn’t search for other restraints other than competition because______.
选项 A、they solely focused on competition
B、they had no idea of other restraints
C、they had more interest in competition
D、other restraints were of little importance
答案A
解析 细节题。第二段最后一句指出，经济学家们在市场的某一方寻找经济自我调节机制：卖方约束卖方，买方约束买方，这就是竞争。第三段前两句指出，他们开始只注意竞争，在理论上也是如此。那种认为经济体中可能存在另外一种调节机制的观点已经完全被排除在经济思想之外了。末句指出，事实上，如果不去寻找其他制约机制的话，这个结论是不可避免的，它是如此完善，以至于人们只关注竞争，而不去寻找其他的了。故[A]为答案。
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