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Part 1 A bound to concentration: theory 1 - equilibrium configurations technology and market structure from theory to testing natural experiments - the high-alpha industries the low-alpha industries scale, learning, and the unit size effect not by technology alone...Part 2 The size distribution: an outline of the argument in search of a benchmark theory 2 - independent submarkets testing the independent submarkets model. Part 3 Extensions and limitations: technology and market structure revisited extensions and limitations 1 - learning effects extensions and limitations 2 - networks and standards a complex case summing up.
Vahaly et al. (Sun,) studied this question.