International trade : theory and policy / Paul R Krugman, Maurice Obstfeld, Marc J Melitz. Krugman, Paul R. Obstfeld, Maurice. jt.aut. Melitz, Marc J . jt.aut. 382 KRI Includes bibliographical references and index. Harlow: Pearson, 2018 2018 2018 Text 368 p. : eng pearson series in economics.