In terms of trading media in real time, we have been focused on how the evolving models of digital-inventory trading will allow us to find advantages for our clients, with more efficient pricing and more effective inventory selection.  Buying at the impression level, as opposed to the placement level, allows segmentation strategies to be executed with greatly reduced waste.  It is the arrival of ad exchanges, such as Right Media and DoubleClick Ad Exchange, which has enabled impression-level buying at massive scale.

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