Building on the current theory of industrial concentration, we analyze the relation between market size and product differentiation, and show how product differentiation impacts market share turbulence. Our basic results highlight that in markets where vertical product differentiation dominates,...

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This Handbook chapter surveys the extensive body of research on the economics of the pharmaceutical industry (with peripheral attention paid also to regulated medical devices). Pharmaceuticals is one of the world's most research-intensive industries, generating a continuing steam of new products...