Market power Homogenous and differentiated products Market shares
Statistical and Social Inquiry Society of Ireland
Whelan, Ciara. 'Barrington lecture 2002/2003: is equating market share to market power a sound economic principle?'. - Dublin: Journal of the Statistical and Social Inquiry Society of Ireland,Vol. XXXII, 2002/2003, pp109-128
Journal of the Statistical and Social Inquiry Society of Ireland Vol. XXXII 2002/2003
There is a long history of mapping market structure into market power in
economic analysis. This paper addresses the validity of this principle for both
homogenous and differentiated products industries. While mapping market share
dominance into market power may be acceptable for homogenous goods as a rule of
thumb, it is by no means a robust result. In the case of differentiated products
industries, there is no theoretical foundation for such a mapping. This paper
highlights the need to move towards a structural approach to assessing market power
Read before the Society, 8 May 2003.
This lecture is delivered under the auspices of the Barrington Trust (founded by
the bequest of John Barrington, Esq.) with the collaboration of the Journal of the
Statistical and Social Inquiry Society of Ireland.
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