How the advertising and marketing channel works The earliest variation of a sales channel that I have the ability to discover is this one from 1904 by Frank Hutchinson Dukesmith, editor of the Salesmanship magazine Below, Dukesmith presented the principle of four phases that lead to a sale: Attention, Rate Of Interest, Wish and also Sentence. Almost half a century later, an advertising as well as sales executive in the pharmaceutical market, Arthur F Peterson, published the following picture in his publication, Drug Selling, Detailing, and also Sales Training: