What Causes Some to Participate in Bubble Markets?

During financial bubbles, such as the one that centered around the U.S. housing market and triggered the Great Recession, some investors react differently than others. Some rush in, trying to "time" the market's rise and fall, while others play it safe and bow out. Ever wonder what accounts for such differences? Read more here: https://www.caltech.edu/news/what-causes-some-participate-bubble-markets-40240