I believe that to a large extent, herding is at play. If other investors sell, it must be because they know something you do not know. Thus, you should sell…. So how much should we worry? This is where economics… gives the dreaded two-handed answer. If it becomes clear… that fundamentals are in fact not so bad, stock prices will recover…. [But] the stock market slump… can become self-fulfilling…. Hope for the first… worry about the second.
- Olivier Blanchard on the current markets