While purchases have slowed from China, the world’s biggest importer, American soybeans got so cheap that other countries have started to increase purchases, US government data show.

Futures for November delivery climbed 4.5% to US$8.945 a bushel on Chicago Board of Trade, the biggest gain since the contract began trading in late 2014. The day before, it had touched its lowest ever after tumbling 17% since the end of May. Soybeans are among the American goods targeted by Chinese tariffs after the US implemented duties earlier in the day and President Donald Trump threatened more action.

“US prices are already at a huge discount to Brazilian soybeans, sending the rest of the world to our doorstep,” Arlan Suderman, chief commodities economist at INTL FCStone in Kansas City, Missouri, said in a report. “Export demand is unseasonably strong from the rest of the world, which is taking advantage of the current fire sale in the oilseed market.”

In the week ended June 28, net American exports more than doubled from a year earlier to 1.02 million tons, based on sales for the current marketing year and the next, according to the US Department of Agriculture. Some amounts that were originally sold to China have been redirected to countries including Pakistan and Bangladesh, the USDA said.

China has been shifting to supplies from Brazil. Soybean premiums at Brazilian ports have surged in recent weeks on expectations that China will boost purchases.