1. College of Health and Human Services, George Mason University, Fairfax, Virginia, and National Bureau of Economic Research, Cambridge, Massachusetts (Cuellar); RTI International, Rockville, Maryland (Mark); Sheppard Pratt Health System, Baltimore (Sharfstein); Department of Health Care Policy, Harvard Medical School, Boston (Huskamp). Dr. Sharfstein, Dr. Huskamp, and Dr. Cuellar are editors of this column.