Patient sorting can confound estimates of the returns to physician human capital. This paper compares nearly 30,000 patients who were randomly assigned to clinical teams from one of two academic institutions. One institution is among the top medical schools in the country, while the other...

In response to unsustainable growth in health care spending, there is enormous interest in reforming the payment system to "pay for quality instead of quantity." While quality measures are crucial to such reforms, they face major criticisms largely over the potential failure of risk adjustment...

Endogenous patient sorting across hospitals can confound performance comparisons. This paper provides a new lens to compare hospital performance for emergency patients: plausibly exogenous variation in ambulance-company assignment. Ambulances are effectively randomly assigned to patients in the...