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This study explores how income inequality among individuals in each country and trade costs depicting geographic distance between countries impact economic welfare and regime choice under representative democracy, comparing three trading regimes: most favored nation, customs union, and free trade agreement. We examine two cases: one in which trade costs are incurred symmetrically among all countries, and the other in which no trade costs are incurred among the potential member countries, but only between them and nonmembers. In each case, we identify the political feasibility of each regime as well as the impact on the average welfare levels. [ABSTRACT FROM AUTHOR]