Abstract
For any business, one of the most important issues is to determine the volume of future sales.This work is devoted to this topic.The approach to solve it is taken by analogy with analytical mechanics: we will consider the commodity market as a dynamic system, the driving forces in which are the marketing strategies of market participants.The main result of this work is the Basic Equation of Economic Dynamics.The resulting equation will allow businesses to properly plan and manage their sales, understanding the dynamic dependence of their marketing activities and the results of these actions.