Martinsson, PeterCarlsson, Fredrik2006-12-012007-02-092007-02-091999http://hdl.handle.net/2077/2846In this paper we test the validity of choice experiments with donations for environmental projects. In particular, we test whether or not willingness to pay for projects differs between a hypothetical and an actual choice experiment. Our results do not indicate that choice experiments suffer from overstatement in hypothetical willingness to pay; and this contrasts the results found in external tests of validity in Contingent Valuation. In addition, internal tests of validity indicate transitive and stable preferences in both experiments19 pages88153 bytesapplication/pdfenChoice experiments; External validity; Internal validity; Hypothetical and actual WTP; Public goodsReportBusiness and economics