Next year, for the first time, programmatic ad spending on private marketplaces (PMP) will surpass that on open exchanges. PMPs—a subset of real-time bidding (RTB) in which some sort of private deal exists between a publisher or a small group of publishers and select ad buyers—will see double-digit growth throughout the forecast period. Growth in PMP ad spending will outpace that of the open markets by about 3 to 1 in 2020 and beyond.
