TY JOUR TI ANALYSIS OF ECONOMY IN PROCUREMENT FOR PUBLIC NEEDS BASED ON A SYSTEM AND RISK-BASED APPROACHES KW contract procurement system KW procurement efficiency KW saving financial resources KW Federal customs service JO Trade, service, food industry AU Demakova, E.A. AU Demina, L.N. AU Menshikova, V.K. PY 2021 IS 1 PB Siberian Federal University