The poor are not irrational; they are just as rational as anyone else, but they operate under very different constraints.
穷人并非不理性；他们和任何人一样理性，但他们在非常不同的约束下行动。
文学是赋予混沌以形式的艺术。
进化是一个漫长的过程。
可持续性不仅仅是一种趋势，更是我们共同的责任。