Retiring on Social Security alone isn't an idea that should excite you. With the average retired worker today collecting just $1,918 a month, or roughly $23,000 a year, those benefits aren't a lot of money to live on by themselves.

That's why it's so important to build savings of your own. And if you have access to a workplace 401(k), you may be inclined to sign up for it.

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Source Fool.com