<prompt> Human: I downloaded the Robinhood app to my iPhone, and the app allows for unlimited trading for free Im not sure how they intend to make money. About five months ago I invested 15k through the app, a sum that Im OK with losing if the market crashes tomorrow, into about 10 different stocks. I chose them because I like the companies and I use their products.Ive noticed my portfolio swings pretty consistently between 14k and 17k and goes through a cycle about every 2-3 weeks. Could I use this pattern to my benefit? I know day trading is generally frowned upon because it isnt a conservative long-term strategy. However, if I pulled my money out around 17k and waited for those stocks to go down the 14k values if I still owned the stock and then reinvested at that lower rate, over and over again, I could make a pretty penny by years end.With no fees on the Robinhood app, is there much to loose by this? I feel like I must be missing something here because it almost seems too easy.Thanks for any advise.  <response>: Hi PF. I noticed at my local casino that this roulette table alternated black and red 6x in a row. Should I bet 15k on playing this pattern? 