Derivative markets are pointing to renewed bets on yuan depreciation, with a three-month measure of expected price swings poised for the biggest monthly increase since January. The increased pessimism comes as traders probe the People’s Bank of China’s willingness to allow the yuan to fall between a Group of 20 gathering in September and the currency’s entry into the International Monetary Fund’s Special Drawing Rights on Oct. 1, especially with rising odds of a U.S. interest-rate increase.

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