This dataset is a market activity dataset, where each market represents a consumption mix of products within a specific region, connecting suppliers with consumers of the same product within that region. The market covers producers and importers of the product within the same geographical area. In addition, the market also takes into account the transport, freight of the product to the consumer, and losses during transportation.

Coal is a type of combustible sedimentary rock, formed from the remains of plants and animals over millions of years under geological changes, in conditions of high temperature and pressure. It mainly consists of carbon, hydrogen, oxygen, and small amounts of sulfur and nitrogen. Coal is the backbone of Chinas energy structure and is widely used in power generation, industry, metallurgy, and other fields.