Mohamed El-Erian, Chief Executive Officer, PIMCO

The world's developed economies are already in deep trouble, but the situation could still get much, much worse. If the Eurozone unravels, no country will be insulated from the consequences. Even if it doesn't, we may be in the midst of a decade-long depression. Stephen Sackur speaks to one of America's most influential economic analysts and investors, Mohamed El-Erian, CEO of PIMCO, which manages more than a trillion dollars of other people's money. What's the best way of the mess we're in?