Exactly how the advertising funnel jobs The earliest version of a sales channel that I have the ability to discover is this set from 1904 by Frank Hutchinson Dukesmith, editor of the Salesmanship magazine Here, Dukesmith presented the principle of four phases that bring about a sale: Interest, Interest, Need as well as Sentence. Almost half a century later on, a marketing and also sales executive in the pharmaceutical market, Arthur F Peterson, published the following illustration in his publication, Drug Selling, Explaining, and also Sales Educating: