My sarcasm detection is not great. Looks like a troll post. Maybe it is real? If it is real, 50% down would mean it lost half its value. 100% down it lost all its value. Even if it was up one billion gillion percent, if it lost 100% of it's value it would be worth zero. But, yes, Enron and Madoff and many brokers are not out to protect your investments

Sarcasm? Real? Here's a hint: EF Hutton did not exist in the 1990s.