https://www.nature.com/articles/d41586-019-00857-9?fbclid=IwAR3nBGEWYeiQVAruyEC04aZirSySWOGze-0otEgPi8Uaq1NjMGzD0pP9G6g
https://www.bloomberg.com/opinion/articles/2018-12-03/u-s-yield-curve-just-inverted-that-s-huge?utm_medium=social&utm_source=facebook&cmpid=socialflow-facebook-view&utm_content=view&utm_campaign=socialflow-organic