TY JOUR TI METHODS OF ASSESSING THE SCALE OF THE SHADOW ECONOMY, THEIR ESSENCE AND FEATURES KW shadow economy KW groups of scaling methods KW informal employment JO Trade, service, food industry AU Demchenko, S.K. AU Schmitt, M.A. AU Nizhelskaya, E.A. AU Arutyunyan, K.M. PY 2022 IS 2 PB Siberian Federal University