Nobel Prize winning economist Paul Krugman, renowned researcher Maurice Obstfeld, and new co-author Marc Melitz of Harvard University, continue to set the standard for International Economics courses with the text that remains the market leader in the U.S. and around the world.
International Economics: Theory and Policy is a proven approach in which each half of the book leads with an intuitive introduction to theory and follows with self-contained chapters to cover key policy applications.

International Economics: Theory and Policy (6th Edition)
by Paul R. Krugman and Maurice Obstfeld

For anybody - but especially students - interested in exploring the subject of international economics, this is the book to start with. It is illuminating (as it is always the case with Krugman's writings) on otherwise technical concepts as comparative advantage, trade policy and exchange rate determinants, but it is also entertaining, with its "reality checks".