TY JOUR TI Macroeconomic challenges and their impact on the development of Russian high-tech companies: the case of MTS PJSC KW high-tech companies KW time series forecasting KW macroeconomic factors KW financial stability KW stock price KW competitiveness KW Prophet model JO JOURNAL OF MONETARY ECONOMICS AND MANAGEMENT AU Kopylov, M.A. PY 2025 IS 0 PB ITBO University