Trader's experience!
Trading is like sailing in the sea, and greed is the hidden reef that may cause your voyage to run aground at any time. In the world of trading, market conditions change rapidly and various temptations come one after another. When prices fluctuate in a direction that is favorable to them, greed will make investors fantasize about getting more profits, thus ignoring potential risks. They may over-hold positions and exceed their established risk tolerance boundaries. Once the market wind reverses, the original profits will instantly disappear, and they may even fall into a serious loss quagmire.