Just read Calvin's letter on usury. He permits Christian to borrow money but forbids them to be usurers. His argument in favor of lending is generally utilitarian. He has one odd proviso. Christians should only borrow if the profit they can make on the borrowed money is equal to or greater than the amount borrowed.
Anyone have any idea why he would require such a large profit. I have no idea what interest rates were in his day or how lending actually worked but the rule struck me as very odd and I'm trying to make sense of it in the context of early capitalism.

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