BEIJING (Reuters) – China’s economy grew at its quickest pace this year between July and September, underpinned by investment, although analysts question if the vigor would continue in coming months. The world’s second-largest economy grew 7.8 percent in the third quarter from a year earlier, in line with expectations, data from the National Bureau of Statistics showed on Friday. So far this year, investment has accounted for more than half of the expansion, showing the challenges faced by Beijing in trying to restructure the economy towards consumption, which policymakers expect to provide more sustainable growth in the years ahead. After slipping in eight of the last 10 quarters, analysts said growth may fall once again in the current October-to-December period. Exports are expected to soften and authorities may also rein-in credit expansion after inflation pushed to a seven-month high. "The growth peak was behind us in the third quarter," […]