On the Fisher-Konieczny index of price changes synchronization

This note provides a structural interpretation for the index of price changes synchronization proposed by Fisher and Konieczny [Fisher, Timothy C.G. and Konieczny, Jerzy D. 2000. Synchronization of Price Changes by Multiproduct Firms: Evidence from Canadian Newspaper Prices,.Economics Letters, 68, 271-277] and shows that it can be used to test the hypothesis of uniform staggering.