And Rebbe Yitzchak said, A person should always divide his money into three: one third in land, one third in commerce, and one third at hand.
-- Babylonian Talmud, Bava Metzia 42a (quoted here)
Americans stupidly now derive 42% of their wealth from stocks:
Through the end of 2021, the share of household wealth that comes from
directly or indirectly held stocks hit a record 41.9%, more than double
where it was 30 years ago, according to data from the Federal Reserve.
