TY JOUR TI Digital activity as a factor of competitiveness of small and medium-sized enterprises KW digital activity KW small and medium-sized enterprises KW competitiveness KW digitalization KW digital transformation KW digital economy KW business processes KW digital technologies KW sustainable development KW digital platforms JO JOURNAL OF MONETARY ECONOMICS AND MANAGEMENT AU Levchenko, R.Y. AU Poluyahtova, E.R. PY 2026 IS 0 PB ITBO University