They say they make companies more efficient through savvy management. Critics say they bend the rules to enrich themselves at the expense of consumers and employees. Can they both be right? (Probably not.) RESOURCES:Plunder: Private Equity's Plan to Pillage America, by Brendan Ballou (2023).Two and Twenty: How the Masters of Private Equity Always Win, by Sachin Khajuria (2022)."Local Journalism under Private Equity Ownership," by Michael Ewens, Arpit Gupta, and Sabrina T. Howell (NBER Working Paper, 2022).“Owner Incentives and Performance in Healthcare: Private Equity Investment in Nursing Homes,” by Atul Gupta, Sabrina T. Howell, Constantine Yannelis, and Abhinav Gupta (NBER Working Paper, 2021).“Leveraged Buyouts and Financial Distress,” by Brian Ayash and Mahdi Rastad (Finance Research Letters, 2021).“Have Private Equity Owned Nursing Homes Fared Worse Under COVID-19?” by Ashvin Gandhi, YoungJun Song, and Prabhava Upadrashta (SSRN, 2020).“When Investor Incentives and Consumer Interests Diverge: Private Equity in Higher Education,” by Charlie Eaton, Sabrina T. Howell, and Constantine Yannelis (The Review of Financial Studies, 2020).“The Economic Effects of Private Equity Buyouts,” by Steven J. Davis, John Haltiwanger, Kyle Handley, Ben Lipsius, Josh Lerner, and Javier Miranda (SSRN, 2019).“How Acquisitions Affect Firm Behavior and Performance: Evidence from the Dialysis Industry,” by Paul J. Eliason, Benjamin Heebsh, Ryan C. McDevitt, and James W. Roberts (The Quarterly Journal of Economics, 2019)."In Silicon Valley, Even Mobile Homes Are Getting Too Pricey for Longtime Residents," by Tracy Lien (Los Angeles Times, 2017).“The Operational Consequences of Private Equity Buyouts: Evidence from the Restaurant Industry,” by Shai Bernstein and Albert Sheen (SSRN, 2013)."Private Equity and Employment," by Steven J. Davis, John C. Haltiwanger, Ron S. Jarmin, Josh Lerner, and Javier Miranda (NBER Working Paper, 2011).EXTRAS:"Should You Trust Private Equity to Take Care of Your Dog?" by Freakonomics Radio (2023)."Do You Know Who Owns Your Vet?" by Freakonomics Radio (2023)."Mobile Home Parks," by The Economics of Everyday Things (2023)."The Secret Life of a C.E.O.," series by Freakonomics Radio (2018)."Extra: David Rubenstein Full Interview," by Freakonomics Radio (2018).SOURCES:Brendan Ballou, special counsel at the Department of Justice.Dan Glickberg, venture-capital investor.Hannah Howard, food writer.Sachin Khajuria, investor.