In honor of Pi Day, which celebrates the mathematical constant pi, let's talk about another mathematical concept: compound returns.

Compound returns occur when you reinvest income that your investments produce, thus earning returns of their own. Just as pi's digits keep going without limit, the wealth-building powers of compounding are theoretically limitless. And the sooner you start investing (and the more you invest), the more powerful compounding can be.

That's why you need to start investing now if you haven't already. And to further celebrate today's special number, here are 3.14 ways to get your money working for you. 

You can invest in a taxable brokerage account, or a retirement account such as a 401(k) or IRA. Both have their benefits, with taxable accounts providing more flexible access to your money. But if you're just getting started investing, a retirement account is a good place to begin. 

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