“…This thesis can be tested not only on a cross-national level but also across various demographic and socio-economic groups. Previous studies reveal that the prevalence of informal payments for health services is greater among women (Baji et al, 2012b;Balabanova & McKee, 2002;Mokhtari & Ashtari, 2012;Riklikiene et al, 2014;Stepurko et al, 2015a;, younger people (Arsenijevic, Pavlova, & Groot, 2015;Balabanova & McKee, 2002;Danyliv et al, 2015;Tomini & Maarse, 2011;Tomini, Groot, & Pavlova, 2012a), those spending with more years in education (Arsenijevic et al, 2015;Baji et al, 2012b;Balabanova & McKee, 2002;Kaitelidou et al, 2013;Riklikiene et al, 2014;Stepurko et al, 2015a;Tomini et al, 2012a), the employed (Kaitelidou et al, 2013), married people (Tomini et al, 2012a), those living in smaller households (Baji et al, 2012b;Stepurko et al, 2015a;Tomini et al, 2012a;Tomini, Groot, & Pavlova, 2012b), rural populations (Danyliv et al, 2015;Tomini & Groot, 2013;Tomini & Maarse, 2011) and lower-income groups (Kankeu & Ventelou, 2016;Szende & Culyer, 2006;Tengilimoglu, Güzel, Toygar, Akinci, & Dziegielewski, 2015;Tomini & Groot, 2013). By testing this hypothesis, whether these populations also have a higher institutional asymmetry and therefore higher propensity to make informal payments can be evaluated.…”