Model of an advertising campaign, when the tilt of curve of demand-price depends on advertisement

In this article, a model of an advertising company is viewed where the factor that defines the shift of curve of price-demand and the factor that defines the tilt of curve are changed under the influence of the advertisement. We find equations that define the optimum moments of completion of the promotion of goods and cessation of the expenses for the advertisements. The profit of the company on a fixed space of time appears as the criterion of optimum.