Please use this identifier to cite or link to this item: https://hdl.handle.net/10419/210440 
Year of Publication: 
2019
Series/Report no.: 
Working Paper No. 883
Publisher: 
Queen Mary University of London, School of Economics and Finance, London
Abstract: 
We use transaction-level data to study changes in the concentration of US imports. Concentration has fallen in the typical industry, while it is stable by industry and country of origin. The fall in concentration is driven by the extensive margin: the number of exporting firm has grown, and the number of exported products has fallen more for top firms. Instead, average revenue per product of top firms has increased. At the industry level, top firms are converging, but top firms within country are diverging. These facts suggest that intensi.ed competition in international markets coexists with growing concentration among national producers.
Subjects: 
Superstar Firms
Concentration
US Imports
Firm Heterogeneity
International Trade
JEL: 
E23
F12
F14
L11
R12
Document Type: 
Working Paper

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