@techreport{NBERw12338,
 title = "Does Price Matter in Charitable Giving? Evidence From a Large-Scale Natural Field Experiment",
 author = "Dean Karlan and John A. List",
 institution = "National Bureau of Economic Research",
 type = "Working Paper",
 series = "Working Paper Series",
 number = "12338",
 year = "2006",
 month = "June",
 URL = "http://www.nber.org/papers/w12338",
}