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...

In this paper we investigate whether multilateral trade liberalisation undermines or encourages preferential trade liberalisation. We use highly disaggregated data at the tariff-line level and find an 'emulator effect' of multilateral trade liberalisation on preferential trade agreements....