Are US Industries Becoming More Concentrated

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Common Ownership in America: 1980–2017 (2019, methodology): “Next we choose the number of firms J = 8 so that our HHI ≈ 1250 to match Grullon et al. (2018).29 Finally, we calibrate a and b for 1980.”
Declining Competition and Investment in the U.S. (2017, unknown): “This is discussed at length in CEA (2016); Autor et al. (2017) and Grullon et al. (2016), among others, so we only highlight the key facts.”
Overlapping Ownership, R&D Spillovers, and Antitrust Policy (2019, unknown): “The documented increase in concentration in the US in the recent decades and the positive statistical relationship between concentration and patents found in recent data (Grullon et al. 2017) may suggest a potential decrease in spillovers and need to tighten antitrust policy.”
How European Markets Became Free: A Study of Institutional Drift (2018, unknown): “…used the idea of the market to promote its agenda of European 3Tangentially, our paper relates to a growing literature documenting the rise in concentration, profits, and markups in the US Grullon et al. (2016) show that concentration and profit rates have increased across most US industries.”