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 Walmart, Target, Kmart, Kohl's Lead 50 Years of Retail Revolution Shaking Up Retail Landscape, Big Four Discounters Reshaped Our Idea of Shopping By Natalie Zmuda, Published on March 19, 2012 5 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. Register Now Already a member? Log in.