Are you looking to get rich on a budget? You're not alone. And, good news! Lots of self-made millionaires became wealthy not because they made tons of income, but because they invested wisely. You can do the same.

You don't need to be a stellar stock-picker to do so either. In fact, investing $100 per month in one simple exchange-traded fund (ETF) will do the trick. The only catch? You need to be able to make this monthly investment for at least 45 consecutive years.

That may be more doable than you think though.

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Source Fool.com