Chinese exports tumbled 8.3 percent in July, their biggest drop in four months and far worse than expected, reinforcing expectations that Beijing will be forced to roll out more stimulus to support the world’s second-largest economy. Imports also fell heavily from a year earlier, in line with market forecasts but suggesting domestic demand might be too feeble to offset the weaker global demand for China’s exports. Economists had forecast exports to fall just 1 percent, after a 2.8 percent uptick in June, but the data on Saturday showed depressed demand from Europe and the first drop in exports to the United States, China’s biggest market, since March. Exports to the European Union fell 12.3 percent in July while those to the United States dropped 1.3 percent. […]