TY JOUR TI The Use of Price Elasticity Coefficients of Demand to Assess the Solvency of Freight in Railway Transport for Tariff Purposes (on the Example of the Russian Federation in 2006–2023) KW Solvency of goods KW coefficients of price elasticity of demand KW freight railway tariffs KW infrastructure-locomotive component of the tariff KW wagon component of the tariff JO Bulletin of scientific research results AU Egorov, Y.V. PY 2023 IS 2023 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"