Discussion paper

DP6368 Zeros, Quality and Space: Trade Theory and Trade Evidence

Bilateral, product-level data exhibit a number of strong patterns that can be used to evaluate international trade theories, notably the spatial incidence of "export zeros" (correlated with distance and importer size), and of export unit values (positively related to distance). We show that leading theoretical trade models fail to explain at least some of these facts, and propose a variant of the Melitz model that can account for all the facts. In our model, high quality firms are the most competitive, with heterogeneous quality increasing with firms? heterogeneous cost.


Baldwin, R and J Harrigan (2007), ‘DP6368 Zeros, Quality and Space: Trade Theory and Trade Evidence‘, CEPR Discussion Paper No. 6368. CEPR Press, Paris & London. https://cepr.org/publications/dp6368