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Three money mistakes you want to avoid — and what to do instead

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'Predictably Irrational' author on three common money mistakes and how to...

Dealing with your personal finances can be difficult, yet many common money mistakes can be traced to simple behavioral tics.

Dan Ariely, a professor of behavioral economics at Duke University and the chief behavioral economist at Qapital, points to three particularly challenging situations to navigate: How you decide what to buy, the way you pay for it, and how much you leave for savings.

Watch this video to find out Ariely's tips to help circumvent these common money mistakes that may be weighing down your finances.

More from Invest in You:
The investing mistakes you want to avoid as the market sinks — and what to do instead
Americans are more in debt than ever — experts say 'money disorders' may be to blame

—Additional reporting by CNBC's Robert Exley Jr.

Disclosure: NBCUniversal and Comcast Ventures are investors in Acorns.