TY JOUR TI MARKETING PROTECTOR AS A BUSINESS TOOL FOR KEEPING COMPETITIVE POSITION IN THE MARKET KW national economy KW crisis phenomena KW enterprise KW marketing system KW marketing simulation KW value chain KW marketing-behavioral reflection KW marketing protector KW commercialization changes KW competitive advantages KW created value KW model of competitive position retention JO Vestnik of Astrakhan State Technical University. Series: Economics AU Krivosheeva, E.. AU Yeremeev, A.. AU Shchepakin, M.. PY 2017 IS PB Astrakhan State Technical University