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Warren Buffett holds enough cash to buy 476 companies in the S&P 500
(www.mitrade.com)
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Kinda like this? https://www.npr.org/sections/thesalt/2013/10/24/240557784/buffett-family-puts-money-where-their-mouth-is-food-security
Or this?
https://en.m.wikipedia.org/wiki/Purchase_for_Progress
Edit: not to mention, feeding 42M people for a year is great, but it's a far cry from solving world hunger.