@techreport{NBERw13862,
 title = "Is Medicine an Ivory Tower? Induced Innovation, Technological Opportunity, and For-Profit vs. Non-Profit Innovation",
 author = "Jay Bhattacharya and Mikko Packalen",
 institution = "National Bureau of Economic Research",
 type = "Working Paper",
 series = "Working Paper Series",
 number = "13862",
 year = "2008",
 month = "March",
 URL = "http://www.nber.org/papers/w13862",
}