This thesis attempts to show that, although it is in the interest of regional common market organizations to regulate foreign direct investment, such regulation will probably be unsuccessful unless the regulations are lenient to business and are not used as instruments of major political goals. The east African Community, the Andean Common Market, and the European Economic Community are examined. Research sources used were United States government publications, documents from the common markets involved, United Nations and International Monetary Fund statistics, articles from major political science and business journals, and books.