I think things are a little more complicated than that in modern times. Most modern nations have economies with built-in inflation. The inflation rate for the US last year was 2%. So if I loaned you money and gave you a year to pay it back without any interest then I am losing 2% of the monetary value of that loan. It is actively costing me money to lend you money, even if you repay in full.
On the one hand, I don't think lending with roughly enough interest to match inflation is usury. You're just expecting back the same value you have loaned. On the other hand, there are many rampant examples of usury in our society. Just look at payday and title loan companies. I would probably argue that those rent to own furniture stores employ usury.
There's a big grey area between the rate of inflation and the examples above. Is it usury to charge higher interest than inflation to cover the risks of default? Maybe, but at some point if your default rate is high enough then you're back to title loan 1000% per year territory. Personally I'd argue that anything over the inflation rate is usury, but then again I have a mortgage at 4%. So I'm probably contributing to the moral bankrupcy of America.
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