This negative oil price event is unprecedented. It surprised even veteran oil traders with decades of experience. It has shaken conservative people who thought their risk management rules will protect them from financial markets. One popular risk management rule is not to risk more than 1% of your equity. This rule won't protect you from negative oil price if you're caught in it. Imagine on that fateful day, you bought oil at $0.10. You thought you got bargain of a lifetime and who can argue with you over that? Soon, oil slipped to -$37. Many traders were not able to get out of their positions when oil price went negative because the brokerage software got confused and did not allow orders to go through for negative prices. Gosh. You're dead many times over since you lost many times your principle. Even a well-capitalised trader putting on a small position will blow up his account. So, what risk management lessons do you learn from this -ve oil episode? What new rule would you add to your risk management rulebook to protect yourself from similar events in future?