In his classic 1992 book about the Ronald Reagan 1980s (and so much more), The Seven Fat Years, Robert Bartley described the great Arthur Laffer describing the universality of credit. It goes like this:
“Laffer would draw a tiny black box in the corner of a sheet of paper. ‘This is M-1,’ currency and checking deposits. A bigger box was M-2, including savings deposits. Still bigger ones included money-market funds, then various credit lines. Finally, the whole page was filled with a box called ‘unutilized trade credit’ – that is, whatever you can charge on the credit cards in your pocket. Do you really think, he asked, this little box controls all of the others? The money supply, he insisted, was ‘demand determined.’”
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