Abstract
This paper first replicates the findings established by the ‘Leontief Paradox’, namely that over a long historical period the USA has regularly absorbed labor and economized on capital through its international trade. Next, technological change is shown to have exercised a systematic influence on the factor contents of US trade in recent decades. An economic interpretation of these findings is offered, taking a dynamic rather than a comparative static point of view. Finally, recommendations are made for extending the conceptual framework used in this paper in the direction of operational theory of international trade.