Imported Intermediate Inputs and Domestic Product Growth: Evidence from India
利用印度企业和贸易数据，研究发现贸易成本下降和进口中间品增加显著扩大了国内企业的产品种类，其中关税降低解释了约31%的新产品引入。
New goods play a central role in many trade and growth models. We use detailed trade and firm-level data from India to investigate the relationship between declines in trade costs, imports of intermediate inputs, and domestic firm product scope. We estimate substantial gains from trade through access to new imported inputs. Moreover, we find that lower input tariffs account on average for 31% of the new products introduced by domestic firms. This effect is driven to a large extent by increased firm access to new input varieties that were unavailable prior to the trade liberalization. (c) 2010 by the President and Fellows of Harvard College and the Massachusetts Institute of Technology..