Why must we buy? Black Friday's powerful pull - Article Photos 5/8

Shoppers rummage through a pile of sweaters on sale at a J.C. Penney store, Friday, Nov. 23, 2012, in Las Vegas. Despite a surge of resistance as the sales drew near, with scolding editorials and protests by retail employees and reminders of frantic tramplings past, Black Friday's grip on America may be stronger than ever. (AP Photo/Julie Jacobson)