TY JOUR TI MODEL OF EFFICIENCY OF AGRARIAN BUSINESS OF THE REGION KW agricultural business KW agriculture KW investment attractiveness KW investment climate KW resource efficiency KW return on investment KW return on capital JO Russian Journal of Management AU Samygin, D.Y. AU Keleynikova, S.V. AU Keleynikova, S.V. PY 2018 IS 6 PB Publishing Center RIOR