TY JOUR TI The Digital Economy: A Review of Theoretical Approaches and Analysis of the Transformation of Traditional Economic Models KW digital economy KW digital transformation KW platform business models KW network effects KW data economy KW antitrust regulation KW GDPR KW DMA KW theoretical review JO JOURNAL OF MONETARY ECONOMICS AND MANAGEMENT AU Smoktal', N.N. AU Bezpal'ko, A.R. AU Zolotova, Y.V. PY 2026 IS 0 PB ITBO University