Delegates gather after year of pain

2011 was a year of confidence-sapping news. So what comfort will attendees of the annual meeting of the World Economic Forum be looking for when they arrive in Davos this week? Seb Morton-Clark reports with contributions from Lionel Barber, editor, Martin Wolf, chief economics commentator, Paul Voser, chief executive of Royal Dutch Shell, and Paul Polman, chief executive, Unilever.