The prices of cotton and wheat are generally in September-65438+February, which is the peak period, because the state will release the purchase price in spring.

Rubber, copper, silver and steel are generally closely related to the economic environment. If we want to talk about the seasonality of peaks and valleys, I think steel and rubber are from September to 65438+ 10. The price of copper you are talking about is not influenced by six start-ups, but the ore manufacturers all over the world (BHP Billiton Vale) will sign next year's ore price in 165438+ 10, so as long as there is operation, the price fluctuation will be shown.

If you want this information, I will give it to you at work on Monday.