Facebook changed around their policies to prevent media buyers from committing arbitrage. What some media buyers are doing is buying ad inventory for cheap and then selling it to clients for a markup. Often times, agencies accuse each other of messing with a client’s money. Big brands like Ford, Citibank, Unilever, and Kimberly-Clark had to pull their advertising budgets from online ad agency trading desks because the agencies could not explain how the money was being spent, according to BusinessInsider.
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