https://www.nber.org/system/files/working_papers/w30028/w30028.pdf
https://www.nber.org/system/files/working_papers/w27488/w27488.pdf
http://www.bankofengland.co.uk/publications/Documents/speeches/2017/speech968.pdf
https://www.imf.org/~/media/Files/Publications/WEO/2018/October/English/c2.ashx?la=en