To play his large-scale public-goods game, Dr Christakis recruited 785 volunteers via MechanicalTurka service provided by Amazon, an online retailer, that works by farming out small tasksto an army of individual workers. Each volunteer was randomly assigned links to, on average,eight other players. Together, they played repeated rounds of one of three variations of thegame.
为了将这个公开物品游戏推而广之,克里斯塔博士通过土耳其机器人召集了785个志愿者。每个参与者都能够随机分配到几个邻人,平均来说,每个人一般能分到八个邻人。他们一起参与三种不同游戏形式,在每种形式中都会反复玩上几轮。
In the first, participants always interacted with the same group of people. In the second, theconnections were randomly reshuffled after each round. In the final version, one-third of thepossible pairings between participants were chosen at random after each round . Oneplayer from each pair was first told or reminded of how the other had behaved in the previousround, and was then asked whether he wanted to break his connection with that player, if healready had one, or form a new connection, if he had not.
起初,参与者总是与同组人玩。接下来,每结束一轮,参与者之间的联系都会随机打乱,并重新分组。在最后的阶段,每一轮结束时都会随机挑选出三分之一的参与者让他们有机会重新配对。每对组合中都会有一个人能够首先得知合作对方或将要合作的参与者在过去的游戏中表现如何,然后会问他是否还愿意和对方合作,或者是否愿意和对方结伴。
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