translation.en: The explanation of human behavior that we inherited in the 20th century was that we are all rational, self-maximizing actors, and in that explanation -- the daycare center had no contract -- should have been operating without any constraints.
translation.zh: 自20世纪遗传下来的人类行为的解释 说法， 那就是我们人类都是理性的，自我最大化的演员。 在这解释下- 日托中心没有合约- 也没有任何运营限制。