The old saying “it takes money to make money” was once true for Wall Street. Only the well-heeled could afford to invest in the stock market. But that’s not the case any longer. The democratization of investing means investors with as little as $100 can start building their retirement nest eggs immediately. Online discount brokerages make it easy to buy and sell shares. And Robinhood (NASDAQ:HOOD) forced the industry to virtually give up transaction fees. Buying and selling stock now is essentially free. Mo ...