World trade: an overview -- Labor productivity and comparative advantage: the ricardian model -- Specific factors and income distribution -- Resources and trade: the heckscher-ohlin model -- The standard trade model -- External economies of scale and the international location of production -- Firms in the global economy: expot decisions, outsourcing, and multinational enterprises -- The instrumets of trade policiy -- The political economy of trade policy -- Trade policy developing countries -- Controversies in trade policy -- Mathematical postscripts