Since competition for the sale of many goods and services in the United States has foreign as well as domestic sources, the antitrust laws, designed to protect competition in the United States, must consider foreign competition. One important aspect of antitrust law that must include foreign competition is the relevant geographic market used to define the area in which effects on competition must be examined. As foreign competition exerts a greater influence on domestic competition, the United States antitrust laws, designed to protect competition in the United States and in the foreign commerce of the United States, must reflect the international scope of markets. In particular, the delineation of the relevant geographic market, used to define the area of competition in which to examine allegedly anticompetitive acts for violations of the antitrust laws, must extend beyond the United States to incorporate foreign competition that exerts a competitive influence in the United States.
Michael P. O'Brien,
Foreign Competition in Relevant Geographic Markets: Antitrust Law in World Markets,
Nw. J. Int'l L. & Bus.