“…In fact, large passive funds tend to exhibit a more "disciplinarian" attitude toward management (Bolton, Li, Ravina, and Rosenthal (2019))-and institutional common owners not only internalize governance externalities but also are more likely to vote against management (He, Huang, and Zhao (2019)). 10 There are, however, countervailing agency problems: Bebchuk and Hirst (2019) pointed out that index fund managers may not have incentives to monitor management (for evidence that index funds are less likely to vote against management than are active funds, see Brav, Jiang, Li, Pinnington (2019), Heath, Macciocchi, Michaely, andRinggenberg (2019)). Schmidt and Fahlenbrach (2017) showed that increased passive ownership impedes high-cost governance activities and increases 8 See Vives (2020) for an exposition of (a) the tension between market power and efficiency as an outcome of common ownership and (b) a parallel with debates in the 1960s and 1970s over the "structure-conductperformance" paradigm in the field of industrial organization.…”