Personal Finance 101 — Topic 6: What Is Compound Interest? (And Why Einstein Allegedly Called It the 8th Wonder)
The Quote You've Probably Heard "Compound interest is the eighth wonder of the world. He who understands it, earns it; he who doesn't, pays it." This quote gets attributed to Einstein constantly, on posters, in finance videos, probably somewhere in your own feed. Here's the catch: there's no solid historical evidence he ever actually said it. It's one of those quotes that sounds so fitting for a genius that it stuck, regardless of who actually said it first. But here's the thing, whoever said it was right about the concept, even if the attribution is shaky. Compound interest really is one of the most quietly powerful forces in personal finance. It's just usually working for you in investing, or against you in debt. What Compound Interest Actually Is Compound interest is interest earned not just on your original amount, but on the interest that amount has already earned. Compare it to simple interest, which only ever calculates interest ...