National Bureau of Economic Research

In recent years, there has been a dramatic increase in hospital acquisitions of physician practices that has transformed the structure of healthcare delivery across the United States. While antitrust enforcement has typically focused on horizontal mergers between direct competitors, there has been less regulatory scrutiny of these vertical or complementary acquisitions despite their potential impact on competition and pricing.

In Are Hospital Acquisitions of Physician Practices Anticompetitive? (NBER Working Paper 34039), Zack Cooper, Stuart V. Craig, Aristotelis Epanomeritakis, Matthew Grennan, Joseph R. Martinez, Fiona Scott Morton, and Ashley T. Swanson examine whether practice acquisitions...

Death rates due to drug poisonings began to surge in the US in the mid-1990s, marking the emergence of an epidemic that has persisted for three decades. The health consequences have been stark, with annual deaths exceeding 100,000 since 2021.

In Prescription for Disaster: The SSDI Rate, Pain, and Prescribing Practices (NBER Working Paper 34265), William N. Evans and Ethan M. J. Lieber examine characteristics of counties in 1990—prior to the surge—that predict the county-level severity of opioid deaths after 2000. After considering a wide range of potential determinants, they focus on one factor: the percentage of the working-age population...

Global value chains have come under severe scrutiny in the past few years. Pandemic-era shortages, geopolitical concerns, and new industrial strategies have all revived an old worry: have firms become too dependent on a handful of foreign suppliers and assembly hubs? Should governments use policy tools such as tariffs or subsidies to promote domestic manufacturing employment and capabilities?

The heart of this debate centers around a firm’s decisions about whether and how to participate in global value chains: which countries will supply its components, where should it open assembly plants, and what foreign markets shall it enter to sell its goods?

Our research starts from the premise that the right unit of analysis for understanding this system is not the country or the industry, but the firm…

Younger entrepreneurs are disadvantaged in small business loan markets because lenders rely heavily on personal credit scores, which favor long histories of repaying debt. In Modernizing Access to Credit for Younger Entrepreneurs: From FICO to Cash Flow (NBER Working Paper 33367), researchers Christopher M. Hair, Sabrina T. Howell, Mark J. Johnson, and Siena Matsumoto document this fact and show that younger entrepreneurs benefit from underwriting that augments personal credit scores (like FICO) with cash flow data. They analyze comprehensive…