A few years ago, PR Week sat down for an interview with Hans Bender, then manager of external relations for global household care at Procter & Gamble. Bender had just completed a large study on the return on investment (ROI) of public relations.The study looked at the marketing mix for six different brands and found something interesting. The ROI for public relations averaged 275%—much higher than advertising. And PR drives the same level of sales as advertising—but at a lower cost.