Record high pork prices may be behind China’s latest trade concession.

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Chinese state-run news agencies said Friday morning that U.S. pork and soybeans will be exempt from additional tariffs. Soybeans make up a large portion of a pig’s diet.

“Based on what I know, Chinese govt encourages Chinese companies to buy certain amount of US farm products, including soybeans and pork, which will also be exempted from additional tariffs,” tweeted Hu Xijin, editor in chief of the state-run Global Times.

Friday’s announcement may seem like a trade concession from China, but there are other forces also at play.

African swine fever has swept across China, causing a 32.2 percent year-over-year drop in the number of live pigs, a Hong Kong-based research team at Citi said in a note sent to clients on Thursday.

They added that the depleted supply caused pork prices to soar by a record 23 percent month-over-month in August to an all-time high of 36 yuan per kilogram in early September, up 76 percent this year.

China is the world’s largest consumer of pork, accounting for 49.3 percent of global consumption, Citi says. Pork makes up 75.4 percent of China’s meat consumption.

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