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The consumer economy isn't just about buying more and more stuff -- there's a flipside.

The more we spend, the less we have to save. That can make planning for the future -- keeping our lifestyle sustainable, in other words -- incredibly difficult.

We want to know: What's the dumbest investment you've ever made -- the one you've regretted the most?

Tell us by tweeting @MarketplaceAPM, posting on our Facebook page or leaving a comment below

Follow Mary Dooe at @@Dooezer