GB-London: Research to provide an overview of the online advertising sector

We are interested in an overview of the online advertising sector, outlining the key players at each stage of the supply chain and their business models. Further, we are seeking robust analysis of the movement of money, data, and content through the online advertising supply chain, including but not limited to how each pound spent by an advertiser breaks down in different scenarios, what service each actor in the chain provides in return for their fees, and how audience/user data flows through the supply chain in the various targeting methods.