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 Interactive Agency Organic Predicts Chrysler Sales With Media-Mix ROI Model Automaker's Digital Agency Correctly Estimated 2008 Numbers Before Talk of Big Three Trouble Even Began By Abbey Klaassen, Published on March 23, 2009 3 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.