Stocks go up, stocks go down, just don’t expect us to tell you why

Chao Deng says we shouldn’t rely on the narratives reporters tell us on why the stock market is up one day and why it is down the next:

The coverage preceding Bernanke’s speech underscores how easy it is for journalists to zero in on a correlation and run with it as causation. But, because movements in the stock market result from trillions of calculations about future prospects for the economy and for individual companies, most of these unknowable, it’s impossible to come up with a solid proof of what the collective psychology is at any one moment. Do ‘bots even have psychology?