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This chapter offers an overview of Data Envelopment Analysis as a nonparametric method of measuring efficiency in production. Special attention is devoted to alternative returns to scale assumptions about the technology and identifying the local nature of returns to scale at projections of an...
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network externalities of consumers that come from congestion and affects firms' differentiation strategies and quality … location and quality in the presence of the congestion cost. We show that the only differentiation set is two firms separate at …
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