【美股小知識】領先經濟指數 (LEI) - https://thestandnews.com/finance/%E7%BE%8E%E8%82%A1%E5%B0%8F%E7%9F%A5%E8%AD%98-%E9%A0%98%E5%85%88%E7%B6%93%E6%BF%9F%E6%8C%87%E6%95%B8-lei/

最简单地看，经济科学只有三个公理。一是需求定律，二是成本概念，三是竞争含意。- http://blog.sina.com.cn/s/blog_47841af70102x0v7.html

inflation - https://www.zmescience.com/science/what-is-inflation-054343/

What is conflict theory? Looking at Marx’s main concepts - https://www.zmescience.com/other/feature-post/what-is-conflict-theory-19092019/