At one level, the requirement that all firms in an industry be involved in a tacit collusion strategy in order for that strategy to be viable seems to contradict the rareness and imitability...

At one level, the requirement that all firms in an industry be involved in a tacit collusion strategy in order for that strategy to be viable seems to contradict the rareness and imitability requirements for sustained competitive advantage, first discussed in Chapter 4. Is it possible to rationalize this apparent contradiction? If yes, how? If no, why not?