Exactly how the advertising and marketing channel works The earliest version of a sales funnel that I have the ability to discover is this one from 1904 by Frank Hutchinson Dukesmith, editor of the Salesmanship magazine Right here, Dukesmith introduced the principle of 4 stages that result in a sale: Focus, Interest, Need and Conviction. Virtually 50 years later, an advertising as well as sales exec in the pharmaceutical industry, Arthur F Peterson, published the adhering to illustration in his book, Drug Selling, Outlining, and Sales Educating: