Trade is measured on a gross sales basis while GDP is measured on a net sales basis, i.e. value added. The rapid internationalization of production in the last two decades has meant that gross trade flows are increasingly unrepresentative of value added flows. This fact has important...

This paper provides a minimalist derivation of the gravity equation and uses it to identify three common errors in the literature, what we call the gold, silver and bronze medal errors. The paper provides estimates of the size of the biases taking the currency union trade effect as an example....

This paper explores the impact of trade on growth when firms are heterogeneous. We find that greater openness produces anti-and pro-growth effects. The Melitz-model selection effects raises the expected cost of introducing a new variety and this tends to slow the rate of new-variety introduction...