The futures markets have circuit breakers in both directions. They are called "limit up" days or "limit down" days. There are stories of commodity traders tha

The futures markets have circuit breakers in both directions. They are called "limit up" days or "limit down" days. There are stories of commodity traders that got entirely wiped out when some futures were limit up or limit down for days or weeks, and that they couldn't exit their positions. When I was trading corn and soy, I've seen a few limit up/down days myself, but thankfully never caught in them.