China’s trains, planes, stores and beaches were a little fuller last month than a year ago, and the pace of activity picked up at factories, particularly those making mobile phones and semiconductors. A batch of numbers released on Friday by China’s National Bureau of Statistics showed a modest improvement in the country’s overall retail sales and industrial production during August. A series of small steps taken by the government over the summer, including two rounds of interest rate cuts, seems to be yielding a slightly better-than-expected improvement in the country’s economy. “The national economy has accelerated its recovery, production and...