Brother, you are talking about futures and not the stock market. What is traded on the stock market are listed companies, which are companies that produce certain products or provide certain services.

Commodities, such as the cotton yarn or oil you mentioned, are forward contracts traded in the futures market, which are slightly different from spot prices. The price of futures trading means that the participants think it is reasonable to deliver or receive the commodity at what price in the future. Therefore, the futures price has a certain guiding effect on the spot price. If the price of the commodity in the futures falls, the spot market Prices of goods on the market will also fall.

The spot prices of some products are directly determined by reference to the transaction prices in the futures market, which makes the relationship between futures and spot prices even closer.