U.S. agriculture and justice officials heard a lot of different concerns about competition within the nationâ??s dairy industry in Madison last week, but one common theme echoed throughout Fridayâ??s workshop was that milk and cheese prices are being influenced by too few at the top. The forum, which is the third in a series of five joint public workshops being held around the nation, was indented to examine competition and regulatory issues in the dairy industry. About 500 people attended the program at the University of Wisconsinâ??s Union Theater.