TY JOUR TI Factor Model of Labor Productivity in the Coal Industry KW multiplicative model KW elasticity of labor efficiency KW labor intensity KW labor costs KW coal mining region KW world coal prices KW economic policy JO Bulletin of Kemerovo State University. Series: Political, Sociological and Economic sciences AU Kharlampenkov, E.I. AU Kudryashova, I.A. PY 2021 IS 2020 PB Kemerovo State University