File photo of customers walking out of a store selling and advertising Apple products in central Beijing

 
File photo of customers walking out of a store selling and advertising Apple products in central Beijing
Customers walk out of a store selling and advertising Apple products, including both the iPhone 4 and iPhone 5, in central Beijing in this September 28, 2012 file photo. Apple Inc shares tumbled more than 6 percent on December 5, 2012, chalking up their biggest single-day loss in four years as fears grow about intensifying competition in the mobile device market. REUTERS/David Gray/Files