It is a “surprise” the practice of agency rebates isn’t a bigger issue, according to David Wheldon, CMO of the RBS Group.

Over recent months, the ANA has claimed senior executives at ad agencies are aware and regularly mandate controversial practices that are often not disclosed to clients. These include cash rebates, rebates as inventory credits and ‘service agreements’ for non-media services such as consulting or research.

Read the full Marketing Week article here.