Associated Gen. Contractors of Cal., Inc. v. Carpenters
In Associated Gen. Contractors of Cal., Inc. v. Carpenters, 459 U.S. 519, 103 S.Ct. 897, 74 L.Ed.2d 723 (1983), the Supreme Court examined the causation requirements of section 4 of the Clayton Act.
Under that statute, "any person who shall be injured in his business or property by reason of anything forbidden in the antitrust laws may sue therefor...." 15 U.S.C. Sec. 15(a).
The Court concluded that the appropriate inquiry to determine whether a plaintiff was injured "by reason of" a violation of the antitrust laws was the same as the common law test for determining proximate causation. (Associated Gen. Contractors, 459 U.S. at 535-36, 103 S.Ct. at 907-08.)