Modern banknotes actually work on a similar principle, except in reverse.15 Recall here the little parable about Henry’s IOU. The reader might have noticed one puzzling aspect of the equation: the IOU can operate as money only as long as Henry never pays his debt. In fact this is precisely the logic on which the Bank of England—the first successful modern central bank—was originally founded. In 1694, a consortium of English bankers made a loan of £1,200,000 to the king. In return they received a royal monopoly on the issuance of banknotes. What this meant in practice was they had the right to
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