The US economy is based on a free enterprise system where the markets, not the government, determine prices. For this system to function properly, there must be competition. "The fundamental purpose of our antitrust laws is to preserve competition and prevent markets from being monopolized," says George A. Hay, Charles Frank Reavis Sr. Professor of Law and professor of economics at the Cornell Law School. "If we had widespread monopoly our economy would be much worse off." The first of those antitrust laws is the Sherman Antitrust Act, enacted in 1890. ... There are three main parts of the Sherman...