Is P&G getting ripped off on advertising?

The Association of National Advertisers has launched an investigation into whether kickbacks affect how ad agencies and media companies do business. The group, whose vice chairman is Procter & Gamble marketing chief Marc Pritchard, said one concern is that media companies might provide rebates to ad agencies for influencing client spending. If ad agencies don’t reimburse such funds to their clients, the practice raises questions about whether an advertiser’s best interests are being considered…