Just about all of us could use extra income. Retirees may not have enough coming in from Social Security and their savings or investments, and those still working may not have as much money available to save and invest as they need.

Enter passive income. If you can set up some streams of passive income, it can have more money flowing into your coffers -- with little to no work required by you. Passive income is hard to beat.

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Source Fool.com