How the advertising and marketing funnel jobs The earliest variation of a sales channel that I have the ability to locate is this from 1904 by Frank Hutchinson Dukesmith, editor of the Salesmanship publication Here, Dukesmith introduced the concept of four phases that bring about a sale: Interest, Interest, Desire and Conviction. Almost half a century later on, an advertising as well as sales exec in the pharmaceutical industry, Arthur F Peterson, published the following picture in his publication, Pharmaceutical Marketing, Outlining, as well as Sales Training: