@techreport{NBERw10017,
 title = "Selection and Improvement: Physician Responses to Financial Incentives",
 author = "Jason Barro and Nancy Beaulieu",
 institution = "National Bureau of Economic Research",
 type = "Working Paper",
 series = "Working Paper Series",
 number = "10017",
 year = "2003",
 month = "October",
 URL = "http://www.nber.org/papers/w10017",
 abstract = {In this study we examine the effects of transferring physicians from a compensation system based on salary to a profit-sharing system. Consistent with theory, we find that the change has a large and significant effect on the quantity of services provided. In addition, we find a selection effect, where the least productive doctors leave the company and more productive doctors join.},
}