Comment on "From Good to Bad Concentration? U.S. Industries over the past 30 years"
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Chapter in forthcoming NBER book NBER Macroeconomics Annual 2019, volume 34, Martin S. Eichenbaum, Erik Hurst, and Jonathan A. Parker, editors
From Good to Bad Concentration? U.S. Industries over the past 30 years, Matias Covarrubias, Germán Gutiérrez, Thomas Philippon