The 80/20 rule: 80% of the results of the work you complete come from 20% of your efforts; and 80% of your efforts only result in 20% of the results. "80% of income comes from 20% of customers. The majority

80% can only have a small impact, while the minority 20% has a major and significant impact. "This is Pareto's law, also known as the "20-80 rule."

The "80/20 rule" derived from business can also be applied to the stock market: most stocks in the market cannot bring profits, but may also cause huge losses. Only a small number of stocks are likely to bring positive returns.

This is the "80/20 rule" in the stock market.