The document discusses different levels of regional economic integration, from free trade areas to political unions. It provides examples like the European Union, NAFTA, and the Andean Community. Regional economic integration aims to maximize gains from free trade by reducing barriers between member countries and adopting common external trade policies. Higher levels of integration also involve coordinating economic, social and foreign policies and establishing common currencies and fiscal policies. Regional integration opens new markets for businesses but also increases competition within the integrated region.