Abstract

The paper defines, implements and compares two empirical tests of relevant markets. While the 1997 test of the EU Commission compares an initial industry equilibrium to an out-of-equilibrium situation, the 1984 US Merger Guidelines test compares the same initial equilibrium to a second equilibrium outcome. We define these concepts formally and apply them to the computer server industry by estimating a model on a large dataset. We find several smaller relevant markets in the low-end segment of servers. In addition, we find that the failure of the '97 EU test to correctly take into account the multi-product pricing strategies of the firms might result in quantitatively significant differences between the two approaches.

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