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Roger Marshall charged his patients 18% annual interest on their unpaid bills. His bakery bill for $678.75 was due six years ago. At 18% interest compounded annually, the total he'd owe would be at least $1,800. Marshall just paid the bakery $1,300—far less than what his patients would owe.

Marshall himself set the 18% annual interest rate he charged clients. www.nytimes.com/2026/09/08/u...

I should add that, thanks to inflation, $678.75 in 2020 would be $873.55 today. So Marshall is only paying double in nominal terms, not in real dollars.