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This note considers cartel stability when the cartelized products are vertically differentiated. If market shares are maintained at pre-collusive levels, then the firm with the lowest competitive price-cost margin has the strongest incentive to deviate from the collusive agreement. The lowest-quality supplier has the tightest incentive constraint when the difference in unit production costs is sufficiently small.
•We consider cartel stability when firms sell vertically differentiated products.•Deviating incentives are decreasing in the competitive profit margin.•The lowest-quality firm has the strongest incentive to defect with similar unit costs.