Most cartels collapse due to organizational and incentive problems. The longevity of the De Beers cartel, now running for more than 100 years, thus is an amazing case study of how to effectively run a cartel At least three industry attributes contribute to the cartel's longevity. First, the industry has an extraordinarily high concentration. In Rhodes's day, De Beers narily not only controlled all of South African(and hence virtually worldwide) production, but also controlled all sales through its wholly owned subsidiary, Central Selling Organization(CSO), in London.