The document discusses various forms of economic integration between countries, from free trade areas to political unions. It provides examples like the European Union, NAFTA, and ASEAN. Economic integration aims to bring economies together as a single market by reducing barriers to trade and capital flows. The effects can include increased trade, investment, and economic growth, as well as impacts on jobs, incomes, and consumer welfare. Regional economic cooperation also seeks to boost competitiveness and stability. The World Trade Organization promotes global integration through trade liberalization and a rules-based trading system.