We all make mistakes -- personal mistakes, financial mistakes, and all kinds of other mistakes. We often assume that people who are smarter or richer or otherwise different from us don't make such blunders, but that's not very true. For example, even the wealthy make plenty of financial mistakes.

Interestingly, many of the mistakes rich people frequently make are ones that we may make, too -- and each mistake can be costly, potentially making retirement less secure. Here's a look at some of these blunders.

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Source Fool.com