“…Market concentration has enjoyed somewhat of a renaissance in recent years. Dismissed for decades by the Chicago School as being largely irrelevant to questions of competition (Triggs & Leigh, 2019), 1 some of the world's top economists (Akerlof, Holden & Rayo, 2018;Blonigen & Pierce, 2016;Wu, 2018), 2 including those from the Chicago School, 3 are now exploring whether high levels of market concentration can help explain some of our most pressing economic conundrums: from low inflation, low investment, low growth and low productivity, to high markups, abnormally high profits and increasing anti-competitive conduct. Some of this analysis, including leading books on competition policy, has used stock markets as a proxy for what is happening in the rest of the economy (Tepper & Hearn, 2019).…”