I. Yu. Vygodchikova
National Research Saratov State University named after N.G. Chernyshevsky (Saratov, Russia)
Russian Federation

Cand. sci. (phys.&math.), associate professor of the Department of Differential Equations & Mathematic Economics, National Research Saratov State University named after N.G. Chernyshevsky (Saratov, Russia)

A. V. Trofimenko
Saratov State Technical University named after Yu.A. Gagarin (Saratov, Russia)
Russian Federation

Associate professor, cand. sci. (law), Saratov State Technical University named after Yu.A. Gagarin (Saratov, Russia)

N. P. Forkunov
Plekhanov Russian University of Economics (Moscow, Russia)
Russian Federation

Postgraduate student, Department of Mathematical Methods in Economics, Plekhanov Russian University of Economics (Moscow, Russia)