https://www.nber.org/system/files/working_papers/w34215/w34215.pdf https://www.nber.org/system/files/working_papers/w34215/w342... this is the direct link to th

https://www.nber.org/system/files/working_papers/w34215/w34215.pdf https://www.nber.org/system/files/working_papers/w34215/w342... this is the direct link to the paper.