translation.en: And so this is what we did, we gave the monkeys choices between guys who were safe -- they did the same thing every time -- or guys who were risky -- they did things differently half the time.
translation.zh: 所以我们让猴子在两个销售员间做选择， 一个是安全的交易者，他会一直拿出同样的商品量； 另一位是有风险的交易者， 他有一半的时间会拿出不同商品。