It's not about ideas. It's about making ideas happen.
The true measure of success is not just profitability, but the positive impact we leave for future generations.
工具变量的美妙之处在于它们让我们以新的视角看世界。
一本书是一面镜子;如果一个傻瓜往里看,你不能指望一个智者往外看。