A question from Yahoo! Answers:

Is any business possible without investment?

No. But if you rephrase the question slightly, say, “is any business possible without ADDITIONAL investment,” then the answer may well be yes, because you start the business with resources you already have. Say, you live in a beach town, so you start renting a room in your house to vacationers. You have a small shop in your garage, so you start fixing your neighbors’ lawn mowers and bicycles. You have a computer and Internet access, so you start designing Web sites for local companies. You live near a lake and like fishing, so you post a notice in a local hotel that you are available as a fishing guide.