Summary

Byron White Fortner Enterprises, Inc. v. United States Steel Corp…

What triggers the application of the antitrust laws is the asserted tying arrangement, the sale of one product conditioned on the purchase of another. And it is not all tying transactions in general but only those where leverage in one market has been used to distort another which so far have been held illegal restraints of trade. The basis for the rule is clear where the seller is dominant in the tying product market, where the product is patented, or where it is in short supply.
Source: Wikisource

Byron White Fortner Enterprises, Inc. v. United States Steel Corp…

Moreover, it is far from clear that, absent power in the credit market, credit financing of purchases should be regarded as a tie of two distinct products any more than a commodity should be viewed as tied to its own price. Since provision of credit by sellers may facilitate competition, since it may provide essential risk or working capital to entrepreneurs or businessmen, and since the logic of the majority's opinion does away in practice with the requirement of showing market power in the tying product while retaining that requirement in form, the majority's per se rule is inappropriate.
Source: Wikisource

Byron White Fortner Enterprises, Inc. v. United States Steel Corp…

This is not, of course, to say that if market power were proved in the tying product the per se rule would be inapplicable, or that it is necessarily impossible to prove market power in the credit market. There may be so few suppliers of credit in a certain relevant market, for example, that they have the power among them to manipulate the price and terms of credit, not necessarily by conspiracy, but by parallel behavior.
Source: Wikisource

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