摘要：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 and hence
growth. The pro-growth effect stems from the impact that freer trade has on the
marginal cost of innovating. The balance of the two effects is ambiguous with
the sign depending upon the exact nature of the innovation technology and its
connection to international trade in goods and ideas. We consider five special
cases (these include the Grossman-Helpman, the Coe- Helpman and
Rivera-Batiz-Romer models) two of which suggest that trade harms growth; the
others predicting the opposite.
关键词：trade and endogenous growth, heterogeneous firms, dynamic versus static
efficiency
