In this groundbreaking volume, Joseph F. Zimmerman examines interstate economic relations. He explores the history of congressional and judicial ground rules governing such relations, direct and indirect interstate trade barriers and means of their removal, and interstate competition for tax revenues, business firms, sports franchises, tourists, and gamblers. He also covers the significant roles played by interstate compacts, federal-interstate compacts, and interstate administrative agreements. Recognizing the importance of harmonious interstate economic relations in promoting economic development, Zimmerman offers specific recommendations to Congress, the president, and state governments for strengthening the economic union.