Korea's chaebols, for example, have been slow to restructure and their workers have staged wildcat strikes.

CNN: FROM BAD TO WORSE

South Africa's mining sector has been hit by a series of wildcat strikes, which have cost millions of dollars.

BBC: South Africa strikes: Sacked platinum miners reinstated

Last year, wildcat strikes and violent unrest over wages spread to a number of mines across South Africa, the world's largest platinum producer.

BBC: South African miners wounded in rival union clashes

Labour unions help industrial peace by discouraging wildcat strikes.

ECONOMIST: China

Britain's union leaders, for example, condemned the recent wildcat strikes against immigrant workers, and Mr Monks is fond of pointing out that workers throughout Europe benefit hugely from the European Union's policy of free movement of labour.

ECONOMIST: Unions