You’ve read all of your free items this month. To register, get added benefits and unlimited access to articles, Become a Member. Already a Member? Sign in. Advertising Age Article Abstract Real-Time Ad Spending Growing Faster Than Expected eMarketer revises forecast up, RTB spend to grow 73.9% in 2013 By Alex Kantrowitz, Published on August 23, 2013 0 Want more Access, Content & Connections? Upgrade to Membership. We are glad you are enjoying Advertising Age. To get uninterrupted access and additional benefits, become a member today. Become a Member Already a member? Log in.