RT Generic T1 Labour as a utility measure reconsidered A1 Ahlheim,Michael A1 Frör,Oliver A1 Nguyen,Minh Duc A1 Rehl,Antonia A1 Siepmann,Ute A1 Pham,Van Dinh WP 2017/03/06 AB In Stated Preference studies for the appraisal of environmental projects in poor countries or regions it often turns out that the stated willingness to pay of people for environmental improvements, which is used as measure of individual welfare changes, is very low. This is often interpreted as the result of extremely tight budget constraints, which make it impossible that people express their true appreciation of an environmental project in terms of their willingness to pay for it. Therefore, it is sometimes suggested to use labour contributions instead of money as a numeraire to measure utility in such studies. In this paper we show theoretically and empirically that this suggestion is not compatible with the principles of welfare theory because of several inconsistencies. We also illustrate the validity of our arguments empirically based on the results of a Contingent Valuation study conducted in a rural area in northern Vietnam. K1 Bewertung K1 Beitrag K1 Öffentliches Gut K1 Kosten-Nutzen-Analyse K1 Entwicklungsländer K1 Vietnam PP Hohenheim PB Kommunikations-, Informations- und Medienzentrum der Universität Hohenheim UL http://opus.uni-hohenheim.de/volltexte/2017/1332