“…In the absence of direct survey methods and with a view to avoiding data inaccuracies or dependency on subjective opinions, economists rely on indirect approach methods, which, contrary to the above-described direct approach methods, are macroeconomic methods since they are based on comparison of different general economic and non-economic indicators, such as GDP, unemployment rate, the number of small and medium enterprises in an industry, household budget data, etc. (Schneider & Buehn, 2013;Simionescu et al, 2017;Sookram et al, 2009;Williams et al, 2007, Ključnikov et al, 2016. Indirect approach methods lean on quantitative data, and the most common indirect methods, which are most commonly employed for estimations of the magnitude of shadow economy, cover income and expenditure methods (e.g.…”