We are at a unique stage in our history. Never before have we had such an awareness of what we are doing to the planet, and never before have we had the power to do something about it.

小说是对一个你无法确切表述的问题的长篇回答。

学习计量经济学的最佳方法是通过实践——处理真实的数据和真实的问题。

最大的风险是不冒险。