Goldman Sachs warns on basketball shoe margins

• Goldman Sachs downgrades Foot Locker (FL -6.1%) to a Sell rating from Neutral.
• The investment firm assigns a $47 price target on shares.
• There's been some concern in the shoe industry that peak margins on basketball shoes could be at risk.
• That development isn't news to Finish Line (FINL -1.6%) which cited bball shoe pricing pressure last month as a factor in its guidance cut.