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 Agencies Duck Liability for Clients' Production Costs As Marketers Look More Precarious, Omnicom Doesn't Want Their Unpaid Bills By Jeremy Mullman, Published on March 16, 2009 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.