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“US Total Media Ad Spend Inches Up, Pushed by Digital Read More,” eMarketer Daily, August 22, 2013.

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Kate Maddox, “Real-time Bidding Pushes Display Advertising to Double-digit Growth,” AdAge BtoB, November 18, 2013.

11

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12

Alistair Barr and Jennifer Saba, “Analysis: Sleeping Ad Giant Amazon Finally Stirs,” Reuters.com, April 24, 2013.