Einstein allegedly called compound interest the eighth wonder of the world. Benjamin Franklin defined it more poetically: "Money makes money. And the money that money makes, makes money." Here's ...

Compound interest can help turbocharge your savings and investments, or it can quickly lead to an unruly balance, keeping you stuck in a cycle of debt. Its magic can help you earn more — or owe more.

Why do people invest? It's not just to get a tax break from contributions to a 401(k). The ultimate reason is that we want our money to grow for the future. The way that money grows, and the biggest ...