It’s been a turbulent time for the marketing and media industry recently: the very notion of transparency, long a bastion of the client-agency process, has come under fire on several fronts.

Within the last few months, two new industry developments have emerged on the subject of media rebates. One of these came from the Guardian group, revealing that the media conglomerate offers ad space and monetary gains in the form of rebates to agencies. The other came from, of all places, Google: While it does not attempt to make its rebate program a secret, its advertising arm has been reticent to share exact details as far as deals go with agencies and brands.

Read the full Forbes.com article here.