%0 Journal Article %T Mathematical modeling of influence of the cost of an hour of free time on demand in the retail trade %A Ptitsa, N.. %A Nefedov, N.. %K the cost of free time, the radius of servicing, service, sales volume of the enterprise %J Actual directions of scientific researches of the XXI century: theory and practice %D 2014 %N 2 %P 4 %I FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov