Carworkers in southern Guangdong province warned the world last year it could not take cheap Chinese labour for granted any more by successfully agitating for higher wages in a series of industrial actions. Shanghai truckers reinforced that message with a strike of their own last week.

The Chinese government is always wary of workers who possess the wherewithal to organise independent industrial action outside the auspices of the country’s only sanctioned union, the All China Federation of Trade Unions. But Shanghai’s truckers undoubtedly frighten Beijing more.

The adage in western democracies that “all politics is local” has a parallel in authoritarian China, where almost all social unrest is local too. Dozens if not hundreds of small-scale protests, typically labour or land-related, flare every day.