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J. Tirole, The Theory of Industrial Organization. Cambridge, Mass: MIT Press, 1988 [Online]. Available: https://web-p-ebscohost-com.royalholloway.idm.oclc.org/ehost/detail/detail?vid=0&sid=bb837c81-c9d5-4b85-b31b-11a867848216%40redis&bdata=JnNpdGU9ZWhvc3QtbGl2ZQ%3d%3d#AN=11386&db=nlebk