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Should the poor consider investing as a means to becoming rich? 
What could a small guy with $100 do to make himself not poor? The first priority is an emergency fund. One of the largest expenses of poor people are short-term loans for emergencies. Being able to avoid those will likely be more lucrative than an S&P investment. Remember, just like a loan, if you use your emergency fund, you'll need to refill it. Be smart, and pay yourself 10% interest when you do. It's still less than you'd pay for a payday loan, and yet it means that after every emergency you're better prepared for the next event. To get an idea for how much you'd need: you probably own a car. How much would you spend, if you suddenly had to replace it? That should be money you have available. If you think "must" buy a new car, better have that much available. If you can live with a clunker, you're still going to need a few K.  Having said that, the next goal after the emergency fund should be savings for the infrequent large purchases. The emergency fund if for the case where your car unexpectedly gets totaled; the saving is for the regular replacement. Again, the point here is to avoid an expensive loan.  Paying down a mortgage is not that important. Mortgage loans are cheaper than  car loans, and much cheaper than payday loans. Still, it would be nice if your house is paid when you retire. But here chances are that stocks are a better investment than real estate, even if it's the real estate you live in.