This book provides a comprehensive discussion of the economics of International Trade. Key questions related to why countries trade, how they gain from trade, and how international trade can produce winners and losers are answered. The last of these questions is related to the connection of trade to inequality in the distribution of income. The book uses both theoretical models and empirical evidence to answer these questions. It also provides a discussion of the economics of labor migration and international capital mobility. The book also provides a detailed discussion of the welfare implications of various trade policy instruments such as tariffs, quotas, export subsidies etc. This is followed by a discussion of the process of actual policymaking in democratic societies which goes into the realm of political economy. The focus here is on the political economy of trade policy. It also provides a discussion of the economics of preferential trading agreements and a history of multilateral trading agreements under the aegis of GATT (General Agreement on Tariffs and Trade) and its evolution into the World Trade Organization (WTO).