TY JOUR TI NATIONAL CONSUMER MARKET: THEORETICAL AND METHODOLOGICAL APPROACHES TO RESEARCHING TRANSFORMATIONAL CHANGES KW national consumer market KW regional consumer market KW transformation of national and regional consumer markets KW regional economy KW digitalization KW digital economy KW territorial KW digital network structures JO STOLYPIN ANNALS AU Novikova, N.V. AU Dianova, L.S. PY 2025 IS 7 PB Electronic science