Billions of dollars have been spent on pilot programs searching for ways to reduce healthcare costs. I study one such program, where hospitals pay doctors bonuses for reducing the total hospital costs of admitted Medicare patients (a "bundled payment"). Doctors respond to the bonuses by becoming...

Hospitals anchor much of US health care and receive a third of all medical spending, including various subsidies. Nevertheless, some become insolvent and exit the market. Research has documented subsequent access problems; however, less is understood about broader implications. We examine over...

We examine whether relaxing occupational licensing to allow nurse practitioners (NPs)—registered nurses with advanced degrees—to prescribe medication without physician oversight is associated with improved population mental health. Exploiting time-series variation in independent...

We link the county-level rollout of stay-at-home orders to anonymized cell phone records and consumer spending data. We document three patterns. First, stay-at-home orders caused people to stay home: County-level measures of mobility declined 8% by the day after the stay-at-home order went into...

We examine how supply-side health insurance generosity affects patient access, use, and health. Exploiting large, exogenous changes in Medicaid reimbursement rates for physicians, we find that increasing payments for new patient office visits reduces reports of providers turning away...

Car exhaust is a major source of air pollution, but little is known about its impacts on population health. We exploit the dispersion of emissions-cheating diesel cars - which secretly polluted up to 150 times as much as gasoline cars - across the United States from 2008-2015 as a natural...

We examine how the amount a physician is paid influences who they are willing to see. Exploiting large, exogenous changes in Medicaid reimbursement rates, we find that increasing payments for new patient office visits reduces reports of providers turning away beneficiaries: closing the gap in...

We link the county-level rollout of stay-at-home orders to anonymized cellphone records and consumer spending data. We document three patterns. First, stay-at-home orders caused people to stay at home: county-level measures of mobility declined by between 9% and 13% by the day after the...