13期编辑：李子健 审核：陆堇Labour Market Rigidities,
Trade and UnemploymentInequality and Unemployment in a Global EconomyTrade and Inequality: From Theory to Estimation1、Labour Market Rigidities,
Trade and UnemploymentReview of Economic Studies, 2010, 77:1100-1137.Elhanan Helpman,Harvard University and CIFAROleg Itskhoki,Princeton UniversityAbstractWe study a two-country, two-sector model of international trade in which one sector produces
homogeneous products and the other produces differentiated products. Both sectors are subjected to
search and matching frictions in the labour market and wage bargaining. As a result, some of the
workers searching for jobs end up being unemployed. Countries are similar except for frictions in their
labour markets, such as efficiency of matching and costs of posting vacancies, which can vary across
the sectors. The differentiated
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