TY JOUR TI Cumulative Method of the Discount Rate Calculate at the Process of an Investment Project Effectiveness Evaluating KW time value of money concept KW investment KW evaluation of investment project effectiveness KW discount rate KW cumulative discounted rate KW risk KW risk premium JO Scientific Research and Development. Economics of the Firm AU Bykovnikov, I.L. AU Vinokurova, T.K. PY 2025 IS 14 PB INFRA-M Academic Publishing LLC.