Investors like to think of themselves as rational and unattached. Still, the movement of stock prices shows that this isn’t always true — and the existence of technical signals like oversold or undersold confirms that fact. Sometimes, investors let emotions get the best of them and stampede toward the exit following a bad earnings report, CEO departure, or product recall. However, not every negative story is a reason to sell, and investors who trust the data (while keeping a calm composure) often find the b ...