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Kai-Uwe Kühn, How Market Fragmentation Can Facilitate Collusion, Journal of the European Economic Association, Volume 10, Issue 5, 1 October 2012, Pages 1116–1140, https://doi.org/10.1111/j.1542-4774.2012.01083.x
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Abstract
Economists have recommended the fragmentation of capacities before regulated markets are liberalized because static oligopoly models imply that outcomes approximate perfect competition with a fragmented enough market structure. This intuition fails under collusion. When individual firms are capacity constrained relative to total demand, the fragmentation of capacity facilitates collusion and increases the highest sustainable collusive price. Collusive outcomes remain feasible even for arbitrarily fragmented capacity. These results can explain the finding in Sweeting (2007, Economic Journal, 117, 654–685), that dramatic fragmentation of generation capacity in the English electricity industry did not reduce price cost margins.