I meant "free market" in the sense of open trades on an exchange. Except for exigent or criminal cases, it's very difficult to undo trades. The "That's not fair

I meant "free market" in the sense of open trades on an exchange. Except for exigent or criminal cases, it's very difficult to undo trades. The "That's not fair"-argument doesn't work except for exigent (circuit breaker halt) or criminal cases.