While attitudes toward doing business in China have quickly soured, patterns of production have been slower to change. A survey of 117 leading companies released in August by the US-China Business Council found that business optimism had reached record lows, but US corporations remained overwhelmingly profitable in China, which is still home to the world’s most expansive ecosystem of factories and a lucrative consumer market. Eight percent of the surveyed companies reported moving segments of their supply chain out of China to the United States in the past year, while another 16 percent had moved some operations to other countries. But 78 percent of the companies said they had not shifted any business away from China.