TY JOUR TI SPECIFICITY OF FORMATION OF PLATFORM BUSINESS MODELS IN THE DIETARY SUPPLEMENTS MARKET KW platform business models KW digital economy KW dietary supplements KW dietary supplement market KW marketplaces KW D2C KW digital platforms KW personalization KW network effects KW digital transformation KW consumer behavior KW ecosystems KW trust KW e-commerce JO Russian Journal of Management AU Lukashin, K.V. AU Habarov, V.I. PY 2026 IS 14 PB Publishing Center RIOR