Overheard: Revisiting the K2 Report on media agency practices like rebates and principal media

It’s been a decade since the infamous K2 report was issued by the Association of National Advertisers, which blew open the longtime opaque practice of media agencies holding onto rebates from publishers (instead of passing them back to their clients) as well as pursuing principal media under unclear contracts with clients. And just as its longtime executives (including CEO Bob Liodice) are leaving