How Robinhood's app design may lead to investors taking more risk

Tesla is just one of the most popular stocks among retail investors who have flocked to the Robinhood app in recent months. A recent Wall Street Journal article says the app's simplified interface, and its software design choice called "dark patterns" makes it easier to invest and may lead to investors taking on more risk. Thomas Ramsoy is a neuropsychologist who is chief executive of Neurons Inc., an applied neuroscience company. He joins "Squawk Box" to discuss the psychology of trading.