At present, commodities are denominated in US dollars, so the trend of commodity prices is closely related to the US dollar. Generally speaking, when the dollar is strong, commodity prices will weaken, and when the dollar is weak, commodities will strengthen. Of course, this means that commodity prices have been weakening since 20 15. In addition to the strength of the US dollar, the relationship between supply and demand is also an important factor affecting prices.

To sum up, it is the strength of the dollar and the relationship between supply and demand that determines the trend of commodity prices.