This means buying coal in the market and then selling it at a high price, similar to the operation of buying coal at a low price and selling it at a high price in futures trading.

This behavior is to pursue the profit brought by the price difference. In the market where coal supply and demand change frequently and the price fluctuates greatly, coal speculation often occurs.

The coal market is affected by the supply chain of mine production, transportation and trade, the macroeconomic situation, energy policy and other factors, and the price fluctuates greatly. Investors or traders will make a profit by buying low-priced coal and then selling it when the price rises.