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.
Harrisburg is a city in Lincoln County, South Dakota, United States and is a suburb of Sioux Falls. The population was 958 at the 2000 census. The 2008 estimated population, according to the United States Census, was 4,270. The population of the Harrisburg zip code has grown from 2,476 in 2000 to 10,815 in 2007.