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α: calibrated so average coauthorship-adjusted count equals average raw count
A theoretical model is presented, in which supply side differences between countries determine international trade flows. This model is empirically tested at a sectoral level for a group of EU countries, within a framework that focuses on changes through time and differences between countries. The results show that the validity of the theoretical model is limited at sectoral level. However, as expected, we find that the variable representing technological differences is significant and correctly signed for high-technology sectors. The evidence points to the existence of different production functions across countries and to the importance of supply side factors in determining the direction and the terms of trade.