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Theoretical work has suggested that contact between firms in different markets can facilitate tacit collusion. Empirical work on this link has been limited. We address the paucity of empirical evidence with a novel plant-level dataset for the cement industry during the Great Depression. We find that multi-market contact fosters tacit collusion and higher prices based on a new measure of contact that accounts for capacity utilization. A one standard deviation increase in our measure of contact increases prices by around 4.3%. We then examine the effect of the National Industrial Recovery Act's �Codes of Fair Conduct,� introduced in 1933 to stem deflation through cooperative behavior within industries. We find that the effects of the codes were most strongly felt in markets with the highest level of multi-market contact. This suggests that multi-market contact can be a useful �tool� for firms to support collusive outcomes, tacit or otherwise.
