The factor proportions model of international trade is one of the most influential theories in international economics. Its central standing in this field has appropriately prompted, particularly recently, intense empirical scrutiny. A substantial andgrowing body of empirical work has tested the predictions of the theory on the net factor content of a country's trade with the rest of the world, usually under the maintained assumptions of factor price equalization and identical homothetic preferencesacross trading countries (or under quite specific relaxations of these assumptions). In contrast, this paper uses OECD production and trade data to test the restrictions (derived by Helpman) on the factor content of trade flows that hold even under nonequalization of factor prices and in the absence of any assumptions regarding consumer preferences. In a further contrast with most of the existing literature, which has focused on the factor content of a country's multilateral trade, our tests concern bilateral trade flows, thereby enabling the examination of trade flows between only a subset of countries for which quality data (relatively speaking) are available.
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