China lets the yuan drop to below 7 to the dollar as it responds to president Trump threat of additional tariffs of 10% on $300 billion of Chinese goods. Previously the People's Bank of China, China's central bank, defended seven to to the dollar. The weaker Chinese currency would be an offset to the tariffs on Chinese goods.
This has risks for China as in the capital flight from China in 2015-2016. Debt denominated in foreign currencies has built up under an illusion of currency stability, especially for property developers in China with about $55 billion of such debt, according to Moody's.
China's other response was to suspend agricultural purchases from the U.S.
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