“…To explain such cross-national variations in the prevalence of informal payments for health services in Central and Eastern Europe, an institutionalist theory approach is here for the first time adopted. Institutionalist theory (Baumol & Blinder, 2008;North, 1990) has been widely applied in health services research, such as to explain the adoption of health information technology (Fareed, Bazzoli, Mick, & Harless, 2015;Nilashi, Ahmadi, Ahani, Ravangard, & bin Ibrahim, 2016;Sherer, 2010), healthcare reform (Contandriopoulos & Brousselle, 2010), patient-centred preventive care (Ledderer, 2010) and healthcare expenditure (Burnett et al, 2016). Therefore, following advances in institutionalist theory in relation to the wider study of the informal economy (Williams & Horodnic, 2015a, two different approaches to explaining informal payments by patients can be adopted.…”