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ABSTRACTMeasures of concentration are of vital importance for welfare related public policy. It defines market structure, conduct and hence performance in an industry. Theoretical characteristics, of twelve market concentration measures are discussed, and three of them where used as analytical tools to carry out empirical analysis, on the industry. The study used market share data from 2002 to 2013 to obtain concentration levels and trend.It was observed that although the industry, a tight oligopoly by structure was concentrated in absolute measures, concentration levels has also been on the decline from the year 2002, shortly after liberalization of the telecommunication industry. The impact on market concentration on market performance has its roots in both oligopoly theory, and the structure-conduct-performance paradigm. The impact of concentration on industry profit, and industry price was observed to be positive in the Nigeria mobile telecommunication industry. Market concentration had a negative effect on industrial. output. The need to erect a welfare related competition policy is vital. This would ensure that the observed declining concentration trend is sustained, so as to effectively guide the structure, away from monopoly towards a more competitive industry.
