“…He sets the conditions under which lotteries outperform voluntary contribution mechanism, finding that the degree of efficiency obtained is an increasing function of the prize size. After Morgan's contribution, several papers have sought to confirm and further investigate his findings through laboratory (Carpenter et al, 2010;Corazzini et al, 2010;Faravelli and Stanca, 2012;Lange et al, 2007;Morgan and Sefton, 2000;Orzen, 2008;Schram and Onderstal, 2009) or field experiments (Landry et al, 2006;Onderstal et al, 2011). A common finding in this literature is that fixed-prize lotteries or auction mechanisms outperform voluntary contribution mechanism in the private provision of public goods 46 .…”