The document discusses different levels of economic integration between countries including free trade areas, customs unions, common markets, economic unions, and political unions. It provides examples of economic integrations in different regions: the European Union integrating most of Western Europe, NAFTA integrating Canada, Mexico, and the US, Mercosur integrating South American countries, ASEAN and APEC in Asia, and economic communities in Africa. The goals are generally to reduce barriers to trade and movement of goods, services, and factors of production to promote regional economic cooperation and growth.