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 Billionaire Slim Boosts Stakes in NYT as Market Slumps Mexican Tycoon Pays $6.83 to $7.09 for 553,000 Times Co. Shares , Published on August 23, 2011 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.