Saving for retirement isn't easy, especially in this economy. Stock prices have fallen dramatically so far this year, and surging inflation has made it harder for many people to save.

The right investments, though, can get you more bang for your buck. Exchange-traded funds (ETFs) are a low-maintenance type of investment that require very little effort on your part, but they can help supercharge your savings over time.

Not all ETFs are created equal, and some are better options than others. These three funds can give your retirement savings an enormous boost while still limiting your risk.

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Source Fool.com