Stock Market (in the wild)
“‘Unfortunately, stock prices are almost impossible to predict,’ Patton said. ‘But what we can look at are things like risk and correlation.
‘For instance, it is well known that a given bundle of stocks often decline in value together, but those very same stocks rarely increase in value together,’ he said. ‘In other words, there’s something very different going on in a bear market than in a bull market, and my research tries to capture that difference.'”
I’m pretty sure that is really interesting.