Antitrust and Trade Regulation laws aim to promote free competition in the marketplace. Agreements or cooperative efforts by two or more entities that affects or restrains competitors is illegal under these laws. The Sherman Act makes illegal any contract, combination, or conspiracy in restraint of trade or commerce and makes monopolies and attempts, combinations, or conspiracies to monopolize illegal. The Clayton Act regulate price discrimination, tying and exclusive dealing contracts, stock acquisition and interlocking directorates.
Dunnigan (formerly, Antelope) is an unincorporated community in Yolo County, California on Interstate 5. The population was 717 at the 2006 census. Dunnigan's ZIP code is 95937 and its area code 530. It lies at an elevation of 69 feet (21 m).