If you're one of those investors drawn to index funds, good for you! Index funds have a lot going for them:

Indeed, index funds can be all you need to generate your retirement savings.

There's a catch, though: Which index you're tracking matters a lot. For instance, if you think it's good to go with an index fund tracking the Dow Jones Industrial Average, you might want to think again. Here's a look at why, and a recommendation of an alternative (more impressive) index fund to consider.

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Source Fool.com