I am using Interactive Brokers for stocks and futures. With a margin account, it is possible to make silly fat finger mistakes like; - buy instead of sell and vice versa. Happened before quite a number of times. - key in extra zero. Happened before but thankfully, I keyed in many more zeros and IB caught the mistake. - mistake USD with JPY. So far, not yet happen. - accidentally short-sell. Happened before. Took the losses to buy back immediately. - mistake number of future contracts with number of shares. Thank god not yet happen. The prospect of fat finger mistakes gives me nightmares because it can throw me and my family into poverty. We are all humans. Over a multi-decade trading career with relatively high trading frequency, occasional careless mistakes are quite hard to avoid. How do elite traders on this forum manage this risk, given that even professional traders can make such mistakes? I am a retail trader/investor.