List of factors which facilitate collusion continued..
Similar market shares
Less like one firm will feel the need to "catch up."
Economic stability
Instability, especially recessions, hurt profits and sales and will generally lead to price cuts to increase sales.
Ease with which "cheating" can be observed
If it's easy to observe your competitor's prices cheating will be less likely. In some industries where most sales are at the wholesale level it may be more difficult.
History of similar pricing

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