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Education·12 June 2026·5 min read

A short history of interest — from grain to APR

Interest is older than coinage. It began with seed that multiplies and became the percentage you see on any loan today.

A short history of interest — from grain to APR
Image: CC0 · Wikimedia Commons

In ancient Mesopotamia, thousands of years before coins, people lent seeds and animals. If you borrowed a sack of grain, you returned more — because the seed, once sown, produced a harvest. That was the first interest: a share of the yield that the borrowed goods made possible.

Between benefit and usury

Throughout history, interest has been both a help and a trap. Too high, it becomes usury and crushes people. That is why today there are rules and a clear indicator — APR — showing the real yearly cost of a loan.

Learn interest safely

In Kosron Bank you can take a simulated loan, see the amortization schedule, calculate how much extra you pay and what early repayment means. You understand first-hand (but without real risk) why interest is one of the most important financial lessons.

Interest is neither good nor bad. It is a tool. Those who understand it use it; those who don't are used by it.