TY JOUR TI EXPLORING THE INTERPLAY BETWEEN OPERATIONAL EFFICIENCY AND MARKET COMPETITIVENESS WITHIN THE FOOD SERVICE SECTOR KW foodservice market KW restaurant business KW market trends KW regional differentiation KW expert opinions KW management decisions KW operational efficiency KW Russia JO Trade, service, food industry AU Chaplina, A.N. AU Klimenkova, T.A. AU Gerasimova, E.A. PY 2026 IS 6 PB Siberian Federal University