Chicago approves a plan requiring big-box retailers to pay a "living wage" to their employees, making it the biggest city in the nation with such a law. The city council brushed aside warnings from Wal-Mart and other companies to pass the ordinance after three hours of debate. The measure requires mega-retailers to pay wages of at least $10 an hour plus $3 in fringe benefits by mid-2010. Critics say it will lead to hemorrhaging of jobs in the city. A court challenge is expected.