“…a behaviour), analysing the results of previous empirical studies, it becomes quickly apparent that tax morale has a strong effect on various forms of tax non-compliant behaviours. Lower levels of tax morale are associated with higher levels of tax evasion/lower levels of tax compliance (Brink and Porcano, 2016;Dell'Anno, 2009;Kirchgässner, 2010;Lima and Zaklan, 2008;Lisi, 2015;Stark and Kirchler, 2017;Sumartaya and Hafidiah, 2014;Torgler and Schaffner, 2007;Torgler et al, 2008), higher levels of shadow economy (Halla, 2012;Torgler and Schneider, 2006, higher participation in undeclared work (Williams andHorodnic, 2015c, 2016a;Windebank and Horodnic, 2017) or higher participation in underreporting wages (Williams and Horodnic, 2015a, b, c, d, e, 2016b, 2017a. Similarly, a large asymmetry between formal and informal institutions was identified as being positively correlated with the informal payments made by patients for healthcare services (Horodnic and Williams, 2018;Williams andHorodnic, 2017, 2018).…”