According to the online website of Bazhong, upstream enterprises refer to those industries that are at the beginning of the whole industrial chain and provide raw materials and parts manufacturing and production for other enterprises and manufacturers. Upstream enterprises produce products due to further production, of course, it does not refer to enterprises that produce primary products, but it is the main one. For example, the factory that produces monitors is the upstream enterprise that produces TV.
The downstream industry is mainly raw material processing. Upstream enterprises and downstream enterprises in various industries should share weal and woe, help each other and develop together.