Alessandra Bonfiglioli, Rosario Crinò, Gino Gancia, 08 May 2019

Recent studies documenting the increase of industrial concentration have raised concerns about an era of monopolies, growing profit shares, and low economic dynamism. Using US data, this column investigates the concentration of import sales by country of origin. The results show that among foreign firms selling to the US, the concentration of sales has remained stable by origin country, but it has fallen when pooling firms from all origins. This suggests that intensified competition in international markets coexists with growing concentration among national producers.

Esteban Rossi-Hansberg, Pierre-Daniel Sarte, Nicholas Trachter, 19 October 2018

Recent literature has documented increasing US product-market concentration at the national level. This column argues that when measured at the more relevant local level, concentration has actually decreased over the last 25 years on average and in all major sectors. In the many industries with diverging national and local trends, top firms are bringing down local concentration even as they increase national concentration. These findings support the idea that top firms expand their national market share by opening establishments in new locations, thereby increasing local competition. 

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