Yap's sunken stone and earmarked French gold
As Friedman tells it, drawing on a 1910 account, Yap islanders used large limestone discs called fei as money. Ownership changed without the stones moving, and one family stayed rich from a stone lost at the bottom of the sea that no one had seen for generations. Friedman sets this beside 1932-33, when the Bank of France had the New York Fed relabel gold in its own vault as French-owned: no gold moved, yet markets treated it as a US gold loss, which fed a banking panic.