I think human greed is the hardest thing to control. They of...

I think human greed is the hardest thing to control. They often think that once the stock price rises, it will rise again, and they refuse to sell to make a profit. As a result, it didn't take long for the stock price to drop and I couldn't bear to stop losing. A stop-loss point had already been set but not implemented. As a result, the stock price fell to a complete mess.