The topsy-turvy world of debt

Lending money to the government has traditionally been seen as a low risk investment - and normally an investor gets paid a return for parting with his cash.

However, as the eurozone crisis deepens there has been a curious development.

In some parts of the region, Germany and Belgium for example, investors are actually paying the government to hold their money - in other words interest rates have turned negative.

Jeremy Howell explains how the topsy-turvy world of debt has emerged.