translation.en: eBay solved the prisoner's dilemma and created a market where none would have existed by creating a feedback mechanism that turns a prisoner's dilemma game into an assurance game.
translation.zh: Ebay解决了囚犯困境， 创造了前所未有的市场。他们创造了一个回馈机制， 将囚犯困境变成了合作博弈。