The goal of antitrust advocates is to increase the role of competition, assure that competition works in the interests of consumers, and challenge abuses of concentrated economic power in the American and world economy. Antitrust policies were first enacted during the great robber baron era of American economic history. Men, such as Rockefeller and Carnegie, were forced to split up their companies that monopolised the oil and steel industries of America. Ever since that time, antitrust policies have worked to avoid similar situations. These policies cannot always be effective because of developing circumstances. This book presents studies of different antitrust policies and how they adapt to a rapidly changing economic landscape.