This case was designed to investigate the strategic interaction between organizations with different business models. The case is considered as a competitor to successfully challenge the actions of the platform market is determined by the strong network effects and high switching costs. The case allows students to evaluate the advantages and disadvantages of the platform business model of eBay in comparison with the retail business model Amazon, evaluate the effectiveness of a business model, where the value of the loop of the two players in the industry interact, analyze how Amazon has expanded its business model and overcome barriers to entry in the platform market, creating a winner-take-all effects of the pioneers to discuss how eBay can respond to the new competitive dynamic, exploring both tactical and strategic interaction.;, and to assess the strategic implications of the acquisition in 2011 of eBay GSI Commerce «Hide < br /> by Ramon Casadesus-Masanell, Anant Tucker Source: Harvard Business School 18 pages. Publication Date: April 3, 2012. Prod. #: 712405-PDF-ENG