Regional economic integration refers to agreements among countries in a geographic region to reduce and ultimately remove trade barriers between each other. There are different levels of integration ranging from free trade areas to economic unions. An economic union involves free flow of goods, services, capital and labor between members and a common external trade policy. Regional integration can provide economic benefits from increased specialization and trade. It can also increase political cooperation and influence by linking economies. However, integration poses challenges like loss of sovereignty and potential job losses in some industries.