Tacit collusion is legal only if they are no plus factors: > Courts have held that no violation of the antitrust laws occurs where firms independently raise or

Tacit collusion is legal only if they are no plus factors: > Courts have held that no violation of the antitrust laws occurs where firms independently raise or lower prices, but that a violation can be shown when plus factors occur, such as firms being motivated to collude and taking actions against their own economic self-interests. It is not as clear-cut you are making it seem and collusion even when tacit is highly anti-competitive.