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 Your Marketing Machine: What You Need to Know About Ad Tech 'Stacks' Weigh Convenience of One-Stop Shopping Against Your Biz's Need for Innovation and Agility By Rebecca Lieb, Published on April 09, 2012 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.