International economics : theory & policy / Paul R. Krugman, Maurice Obstfeld, Marc J. Melitz. Krugman, Paul R. Obstfeld, Maurice. jt. aut. Melitz, Marc J. jt. aut. International economic relations. 337 KRI Includes bibliographical references and index. Boston : Pearson, c2012. c2012. 2012 Text 731 p. : eng