Because the major international commodities are denominated in dollars, the corresponding commodity prices have fallen.
Extended data:
The US dollar index, namely USDX, is an indicator that comprehensively reflects the US dollar exchange rate in the international foreign exchange market and is used to measure the degree of exchange rate changes of the US dollar against a basket of currencies. It measures the strength of the US dollar by calculating the comprehensive change rate of the US dollar and the selected basket of currencies, thus indirectly reflecting the changes in the US export competitiveness and import costs.
Baidu Encyclopedia-Dollar Index