Gulf Oil Corp. v. Copp Paving Co.

Background

A local paving contractor, Copp, sued three oil companies and related subsidiaries. The oil companies make liquid asphalt and sell it to subsidiaries that mix asphaltic concrete at local "hot plants." Copp and the subsidiaries compete in a southern Los Angeles market. Copp alleged many antitrust practices — price discrimination, tying, exclusive dealing, and acquisitions — that it said harmed its local business and related interstate markets because some of the concrete is used on interstate highways. The trial court dismissed Copp’s claims about asphaltic concrete for lack of federal jurisdiction. The Ninth Circuit reversed, saying use on interstate highways put the sales "in commerce."

Reasoning

The Court considered whether the Robinson-Patman and Clayton Acts cover sellers and sales that are purely local but supply materials used on interstate highways. It explained that those statutes reach only persons and activities "in commerce," a narrower concept than the Sherman Act’s "affecting commerce" test. The Court rejected a formal "nexus" rule that would treat every supplier to interstate highways as automatically in interstate commerce. It relied on statutory language, legislative history, and the absence of evidence showing substantial effects on interstate markets. Because Copp presented no proof of such interstate effects, the Court reversed the Ninth Circuit.

Real world impact

The ruling narrows when federal antitrust law applies to purely local sales of construction materials. Plaintiffs must show actual or probable harmful effects on interstate commerce to pursue Clayton or Robinson-Patman claims. This decision does not resolve whether the Clayton Act might reach local acts with proven substantial interstate effects.

Dissents or concurrances

A concurring justice limited the opinion’s scope; a dissent argued the Court should have allowed the case to proceed, treating the "in commerce" phrase more broadly.