Coal prices have fallen for two months because of what?

I think there are two main reasons why coal prices have fallen for two months, one is that the price of refined oil products has fallen sharply leading to a corresponding fall in the price of coal. But this effect should be short-term, the price of refined oil will bottom out and rise, the coal price will also get a rise.

The second reason is supply and demand. Demand for media has been dramatically reduced by the epidemic. This has led to a massive buildup of media and thus a drop in prices.