I remember when I was in college in Shanghai, I often saw some old men in their 50s and 60s talking to themselves in some squares or parks. They looked mentally ill and had been stimulated by something. Later, I asked some local classmates, and they said that most of these people had mental illnesses after losing money in stock trading. Many people only saw the dividends in this round of stock cycle, especially some new investors who never thought that they would lose all their money one day.