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Feenstra, R. (2010-08-06). The Extensive Margin of Trade and Country Productivity. In  (Ed.), Product Variety and the Gains from International Trade. : The MIT Press,. Retrieved 20 Sep. 2018, from http://mitpress.universitypressscholarship.com/view/10.7551/mitpress/9780262062800.001.0001/upso-9780262062800-chapter-4.