China’s economy slowed in December, capping the weakest quarter of growth since the 2009 global recession, as the Communist leadership struggles to manage a transition to consumer-led expansion. Industrial production, retail sales and fixed-asset investment all slowed at the end of the year, while gross domestic product rose 6.8 percent in the fourth quarter from a year earlier. Full-year growth of 6.9 percent, the least since 1990, was in line with the government’s target of about 7 percent. Downward pressure on industry threatens to spread to consumption and services — an unwelcome prospect for policy makers who must weigh the need for further monetary […]