Never having heard of a single ‘economist’ thats a self made millionaire, I read this stuff with quite a bit of amusement.
Lord Keynes was a very successful investor. Not sure if he made his initial capital himself, but he was a good speculator supposedly. Milton Friedman was a millionaire mainly through the sales of his books. Allen Greenspan was a millionaire from his consulting business before he even entered government service. It’s actually harder to find a prominent economist that isn’t a millionaire than one that is.