Amazon Faces Concerns with Unauthorized Sellers

Amazon.com Inc is grappling with a problem that eBay Inc has struggled with for years: The proliferation of unauthorized third-party sellers that undercut the world's top consumer brands. The sellers offer online shoppers goods ranging from Guess watches to LG televisions and Adidas sportswear at low prices, upsetting Amazon suppliers who want the world's largest online retailer to crack down on unauthorized discounting.