Startup checklist

https://blog.ladder.io/business-idea/

Jonh Maynard Keynes chairman letter

https://www.docdroid.net/kEKYMNm/john-maynard-keynes-chairman-letters-1921-1937.pdf.html

Warren buffet on pension assumption

http://www.utstat.utoronto.ca/sharp/Files/Press%20articles%20and%20other%20stuff%202008/Buffett/Buffett%202008%20details%20on%20inv%20returns%20v01.pdf