Why agencies’ reluctance to talk about rebates is making marketers nervous

ISBA, which represents 450 major brands including Tesco, Burberry and Coca-Cola, claims global media agencies such as WPP, Publicis and Havas have increasingly been generating profits through controversial business practices that are not visible to their clients.
It says client-agency contracts are typically lacking essential detail around areas such as viewability, brand safety and click fraud, therefore allowing agencies to profit in these areas by setting up separate deals with media publishe