Kirthi Kalyanam, J.C. Penney Professor of Marketing, identified Amazon.com and Walmart's online business as up-and-coming competitors to EBay. The online auction company reported a tripling of its fourth quarter earnings over last year's.
Professor Kalyanam, who studies Internet retailing, says Walmart and other traditional--"bricks-and-mortar"--retailers have entered Web marketing in a big way, bolstered by their physical presence in many communities across the U.S.