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Shapiro (2001) - Navigating The Patent Thicket (view source)
Revision as of 22:52, 25 March 2013
, 22:52, 25 March 2013→Model
Subbing in <math>\sum_i p_i = p - \alpha\;</math>:
:<math>\frac{p - \overbrace{\alpha - \sum_i c_i}{^c}}{p} = \frac{N}{\eta}\;</math>
With a single firm, <math>N=1\;</math>, the Lerner index is <math>\frac{1}{\eta}\;</math>, so with <math>N\;</math> firms the mark-up is <math>N\;</math> times the standard monopoly mark-up.
