Renewed signs of weakness in China’s economy and the slide in oil prices sent world stock markets lower Friday despite robust U.S. retail sales. A source of caution for investors on Friday was data from China. China’s factory output growth declined to 7.2 percent in November from 7.7 percent growth in October and 8 percent in September. Growth in investment in factories and other fixed assets slowed slightly to 15.8 percent for the first 11 months of the year from 15.9 percent in the first 10 months. The data came after […]