US Treasury Secretary Janet Yellen has warned of the threat posed by China’s overcapacity to the global economy. “Direct and indirect government support is currently leading to production capacity that significantly exceeds China’s domestic demand, as well as what the global market can bear,” the 77-year-old told representatives of the US Chamber of Commerce in Guangzhou, southern China, on Friday. “I understand these policies may be driven by domestic development objectives. But overcapacity can lead to large volumes of exports at depressed prices.” China is flooding the global market with pr…