“…Kamei & Putterman, 2013), cost/benefit ratio(Nikiforakis & Normann, 2008), or probability of sanction (e.g.,Dai et al 2014), could potentially yield different results.9 Ostrom's (19909 Ostrom's ( , 2010a Design Principles allude to the connection somewhat, with both participation and enforcement appearing as beneficial factors, but the connection is not fully developed (e.g.,Ostrom, 2000Ostrom, , 2010b.10 For example, used graduated sanctions; Vollan (2008) used rewards and punishments; Vyrastekovia andvan Soest (2003),Mulder et al (2005),Tenbrunsel and Messick (1999) used weak versus strong punishments; and some used centralized enforcement (e.g.,Vyrastekovia & van Soest, 2003), whereas others used self-enforcement (e.g.,, or both (e.g.,Tyran & Feld, 2006).https://doi.org/10.1017/S1930297500006975 Published online by Cambridge University Press…”