China’s economic activity slowed more than expected across the board in August with a sharp slump in investment, adding to the likelihood that policymakers will roll out more stimulus to ensure growth stays on track to hit the official target.Industrial output and consumption had their worst month yet this year after a sharp slowdown in July. Production at Chinese factories and mines expanded 5.2% last month from a year earlier, according to data released by the National Bureau of Statistics on Monday, the ...