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LWassily Leontief (1954) chercha à savoir si le contenu en facteurs de production des échanges internationaux américains répond à la loi des proportions de facteurs. Les États-Unis disposaient déjà d'une abondance en facteur capital. La théorie voudrait qu'ils exportent des produits ayant une proportion forte de capital et importent des produits ayant une proportion forte de travail. Or les résultats de son analyse ont montré le strict contraire.

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