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- June 2025
- Article
Collusion in Brokered Markets
By: John William Hatfield, Scott Duke Kominers and Richard Lowery
High commissions in the U.S. residential real estate agency market present a puzzle for economic theory because brokerage is not a concentrated industry. We model brokered markets as a game in which agents post prices for customers and then choose which other agents to... View Details
Keywords: Real Estate Agents; Real Estate; Realtors; Broker Networks; Brokerage; Brokerage Commissions; ＂Brokerage Industry; Brokered Markets; Brokering; Brokers; Industrial Organization; Repeated Game Framework; ＂Repeated Games＂; Collusion; Antitrust; Microeconomics; Market Design; Theory; Game Theory; Real Estate Industry
- 2025
- Working Paper
An Empirical Examination of Business Climate Alliances: Effective and/or Harmful?
By: Matteo Gasparini and Peter Tufano
This research studies business alliances that seek to address climate change, offering empirical evidence to address claims advanced by alliance supporters and critics. We study eleven major alliances mostly focused on financial services firms and 424 major... View Details
Keywords: Antitrust; Climate Change; Financial Institutions; Competition; Network Effects; Alliances
- November 2024
- Supplement
Epic Games: Nineteen Eighty-Fortnite (B)
By: Andy Wu and Ronald Wang
In a significant ruling on April 24, 2023, the U.S. Court of Appeals for the Ninth Circuit upheld portions of the district court’s decision against Epic Games back in September 2021. However, Apple’s anti-steering provisions, which restricted app developers from... View Details
- May 2024
- Teaching Note
Lina Khan at the FTC: Redefining Antitrust in the Age of Big Tech
By: Joseph L. Badaracco and Susan Pinckney
Teaching Note for HBS Case No. 324-018. View Details
- February 2024 (Revised May 2024)
- Case
Lina Khan at the FTC: Redefining Antitrust in the Age of Big Tech
By: Joseph L. Badaracco Jr. and Susan Pinckney
In 2023 and 2024, the Federal Trade Commission and U.S. Department of Justice sued Google, Amazon, and Apple claiming antitrust violations. These lawsuits marked a shift in U.S. antitrust enforcement away from the Chicago School and towards the New Brandeis school of... View Details
- 2024
- Article
Half the Firms, Double the Profits: Public Firms' Transformation, 1996–2022
By: Mark J. Roe and Charles C.Y. Wang
The number of public firms in the United States has halved since the beginning of the twenty-first century, causing consternation among corporate and securities law regulators. The dominant explanations, often advanced by Securities and Exchange commissioners when... View Details
- 2025
- Working Paper
Antitrust Platform Regulation and Entrepreneurship: Evidence from China
By: Ke Rong, D. Daniel Sokol, Di Zhou and Feng Zhu
Many jurisdictions have launched antitrust enforcement and brought in regulation of large tech platforms. The swift and strict implementation of China’s Anti-Monopoly Guidelines for the Platform Economy (Platform Guidelines) provides a quasi-natural experiment... View Details
- January 11, 2024
- Article
Understanding the Tradeoffs of the Amazon Antitrust Case
By: Chiara Farronato, Andrey Fradkin, Andrei Hagiu and Dionne Lomax
Regulators in the United States and Europe have been taking on Big Tech, challenging what they say are the companies’ anti-competitive and predatory strategies that harm consumers and third-party users of their platforms. This article examines the FTC’s case against... View Details
- November 29, 2023
- Article
To Earn Trust, Climate Alliances Need to Improve Transparency
By: Peter Tufano, Chris Thomas, Knut Haanaes, Matteo Gasparini, Robert Eyres and Christopher Chapman
Businesses are increasingly joining together as part of climate alliances to accelerate the transition away from fossil fuels. But these alliances raise antitrust issues: When competitors collaborate, it can come at the expense of customers or workers. To mitigate... View Details
- March 2023
- Article
Not from Concentrate: Collusion in Collaborative Industries
By: Jordan M. Barry, John William Hatfield, Scott Duke Kominers and Richard Lowery
The chief principle of antitrust law and theory is that reducing market concentration—having more, smaller firms instead of fewer, bigger ones—reduces anticompetitive behavior. We demonstrate that this principle is fundamentally incomplete.
In many... View Details
In many... View Details
Keywords: Antitrust; Antitrust Law; Antitrust Theory; Law And Economics; Collusion; Collaboration; Collaborative Industries; Regulation; ＂Repeated Games＂; IPOs; Initial Public Offerings; Underwriters; Real Estate; Real Estate Agents; Realtors; Syndicated Markets; Syndication; Brokers; Market Concentration; Competition; Law; Economics; Collaborative Innovation and Invention; Governing Rules, Regulations, and Reforms; Game Theory; Initial Public Offering
- October 17, 2022
- Article
When Climate Collaboration Is Treated as an Antitrust Violation
By: Matteo Gasparini, Knut Haanaes and Peter Tufano
Carbon emissions transcend firms and borders—they are a massive, unpriced externality. Companies across industries are increasingly waking up to the need to cooperate in the fight against climate change but the law might get in the way. Across Europe and the U.S.,... View Details
- August 2022
- Article
The U.S. Approach to Antitrust Policy in Technology Markets
By: Shane Greenstein
This report illustrates the strengths and weaknesses of the U.S. approach to antitrust policy by drawing lessons from three cases: United States v. AT&T, United States v. Microsoft, and United States v. Google. The cases against AT&T and Microsoft are historical cases,... View Details
- 2022
- Working Paper
Many Markets Make Good Neighbors: Multimarket Contact and Deposit Banking
By: John William Hatfield and Jonathan Wallen
We investigate the relationship between the interest rates offered to consumers in a deposit banking market and the contact that banks in that market have with each other in other markets.
We show, in a simple theoretical model, that such overlapping relationships... View Details
- October 18, 2021
- Article
To Regulate Network-Based Platforms, Look at Their Data
By: Chiara Farronato and Daniel Björkegren
Historically, antitrust authorities have taken a laissez-faire approach under the assumption that it is better to err on the side of not intervening when there is uncertainty. This has allowed companies like Google and Facebook to go on a shopping spree to acquire... View Details
- Article
Regulating Hospital Prices Based on Market Concentration Is Likely to Leave High-Price Hospitals Unaffected
By: Maximilian J. Pany, Michael E. Chernew and Leemore S. Dafny
Concern about high hospital prices for commercially insured patients has motivated several proposals to regulate these prices. Such proposals often limit regulations to highly concentrated hospital markets. Using a large sample of 2017 US commercial insurance claims,... View Details
- Article
The Covid-19 Pandemic Should Not Delay Actions to Prevent Anticompetitive Consolidation in U.S. Health Care Markets
By: Leemore S. Dafny
This article describes potential regulatory and legislative reforms to assist antitrust enforcement agencies in halting anticompetitive acquisitions and practices, and preserving and promoting competition in health care markets. View Details
- 2021
- Government Testimony
How Health Care Consolidation Is Contributing to Higher Prices and Spending, and Reforms That Could Bolster Antitrust Enforcement and Preserve and Promote Competition in Health Care Markets
By: Leemore S. Dafny
Reforms to antitrust law and enforcement can help to address rising healthcare prices and spending. View Details
- March 9, 2021
- Article
Addressing Consolidation in Health Care Markets
By: Leemore S. Dafny
This Viewpoint proposes three steps the Biden administration can take to slow consolidation within health care, which has been shown to raise costs without improving service or quality: better fund federal antitrust enforcement agencies; appoint agency heads committed... View Details
- 2020
- Working Paper
Vertical Integration of Healthcare Providers Increases Self-Referrals and Can Reduce Downstream Competition: The Case of Hospital-Owned Skilled Nursing Facilities
By: David Cutler, Leemore S. Dafny, David Grabowski, Steven S. Lee and Christopher Ody
The landscape of the U.S. healthcare industry is changing dramatically as healthcare providers expand both within and across markets. While federal antitrust agencies have mounted several challenges to same-market combinations, they have not challenged any... View Details
- October 2020 (Revised August 2022)
- Case
Epic Games: Nineteen Eighty-Fortnite
By: Andy Wu, Miaomiao Zhang and Christopher Zhang
In the midst of intensifying public and political attention towards the market power of big technology, Epic Games in 2020 challenged the status quo that has existed for years in the Apple iOS and Google Android mobile application marketplaces and payment systems.... View Details