This year - 2012 - is the Chinese Year of the Dragon and Chinese workers certainly seem to have fire in their belly.There's growing discontent amongst the workforce whose labour fuelled the country's economic miracle. They're angry that export-led growth has largely passed them by - whilst filling state coffers and enriching some beyond their wildest dreams. Zeinab Badawi speaks to Cheng Siwei - one of China's most influential economists. How much of a threat is economic uncertainty and social unrest to China's prosperity and stability?