Exports, trade tensions and domestic demand

From the BBC World Service: Factories in China have long been an engine of economic growth, so it's worrying for leaders in Beijing that a new survey shows activity unexpectedly contracted in November. It's the eighth straight month that production has shrunk. What's it telling us about the world's second biggest economy? And later, Iran is experiencing an unprecedented drought, with rainfall at record lows and reservoirs nearly empty. Officials are pleading with citizens to conserve water.