A rapidly growing literature has shown that market concentration among domestic firms has increased in the United … measures of concentration, once adjusted for sales by foreign exporters, actually stayed constant between 1992 and 2012. We … reconcile these findings by linking part of the increase in domestic concentration to import competition. Although concentration …

difficulty of separating these two effects. We use newly-developed techniques to separately estimate productivity and markups … that M&As are associated with increases in average markups, but find little evidence for effects on plant …

In this paper, I use firm-level data from Compustat to document the evolution of markups among listed U.S. non … disaggregate this aggregate trend to, first, show that its 2020 growth reflects growing sales concentration. In contrast, the … obfuscates that firms with low pre-pandemic markups command notable markup growth in both 2021 and 2022. Third, I document key …