A sure-fire way to make money on Wall Street right now!
Go to Wall Street in NYC and become a street vendor selling Tums! I suggest keeping the prices low...something that works easily with small coins. Your target market is easily identifiable...they'll have lots of visible sweat and a facial expression that reminds you of deer-in-headlights. Do not attempt to engage them in petty conversation unless you have a very good shoulder to cry on.