Although coal is non-renewable energy, there are too many stocks in this sector, and they all rise and fall with the stock market. When the stock market is not good, it still falls, subject to the rise and fall of crude oil futures. Although it can be invested for a long time, it is suitable for investment of more than 5 years or about 10 years.
Among A shares, there are not many suitable for long-term holding, which is caused by the imperfect stock market system, that is to say, most of them have no investment value.
In other words, varieties with monopoly advantages or technological advantages in the market, such as Kweichow Moutai, Yunnan Baiyao and Dong 'e Ejiao, do not matter whether they are in a bull market or a bear market for several years.