A distinction may be drawn between two kinds of antitrust law, the preventive and the corrective. The preventive seeks to outlaw those forms of behavior which, if pursued far enough, reduce or eliminate competition. The corrective seeks to eliminate monopolistic power already in existence, or at least to curb certain exercises of this power. Undoubtedly, there are policies that fall on the borderline between these categories, but in general, the distinction can be made with tolerable certainty. Almost all of the American antitrust law is corrective. This need not be argued for the Sherman Act, and I think that it is almost as true of the Clayton Act. The latter's prohibitions upon price discrimination and tying-clauses apparently were adopted in part to prevent the appearance or spread of monopoly, but it is evident that both types of policies can arise only when monopoly power is already possessed. No competitive seller will continually accept a lower price from some buyers than he can get by diverting his goods to other buyers; 1 and no buyer with adequate alternative supply sources will accept the limitations imposed by tie-in sales or total requirements contracts without an offsetting reduction in price. Section 7 of the Clayton Act,2 the antimerger section, is the only important instance of preventive antitrust legislationY I shall discuss this section after briefly discussing the general problem of preventive antitrust policy.
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