A recent estimate of the digital ad market puts it at $105 billion[1]. Divide $16 billion by that and you get 15%. [1] http://avc.com/2017/12/the-digital-adver

A recent estimate of the digital ad market puts it at $105 billion[1]. Divide $16 billion by that and you get 15%. [1] http://avc.com/2017/12/the-digital-advertising-duopoly/ http://avc.com/2017/12/the-digital-advertising-duopoly/