What is the incentive for the DeBeers cartel to exist, and what are the benets to its colluding members? What benets does the cartel bring to the market? Have the members of the DeBeers organization been stable over the years or have there been any defections or diamonds leaking to the market? Game theory shows us that collusion might be risky, from the standpoint of the incentive to cheathow does this come to life in the DeBeers case