The 2010 Horizontal Merger Guidelines propose a form of coordinated effects, referred to as "parallel accommodating conduct", that is claimed not to involve the usual evaluation of the ability of firms to detect compliance and punish non-compliance with respect to supracompetitive prices. That...

A theory of tacit collusion is developed based on coordination through price leadership and less than full mutual understanding of strategies. It is common knowledge that price increases are to be at least matched but who should lead and at what price is not common knowledge. The steady-state...