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Horizontal Agreements: Concept And Proof, George A. Hay

George A. Hay

It is well established that, absent some very special circumstances, agreements on price or certain other terms of trade by otherwise competing entities (i.e., "horizontal agreements") are unlawful per se under the Sherman Act. In practical effect, once the fact of the horizontal agreement has been established, an adverse impact on competition is presumed, and therefore that the plaintiff is spared the burden of proving such an impact. The principal task for plaintiffs in such cases, therefore, is establishing the existence of an agreement.

In the ideal world (from plaintiffs' perspective), there would be "hard" evidence of a "formal" agreement. …