TY JOUR TI MODELS of PAYBACK of SUBSIDIES in AGRARIAN BUSINESS KW agrarian business KW agricultural industry KW budgetary subsidies KW efficiency of support KW payback of investments KW return of resources KW obligatory payments KW taxes KW insurance premiums JO Russian Journal of Management AU Samygin, D.Y. PY 2020 IS 8 PB Publishing Center RIOR