Credit card

Neil MacGregor's history of the world as told through things. Throughout this week he is examining objects that speak of the great shifts in human organisation and thinking in the modern world - objects that raise questions about human lives, the environment and global resources. So far this week he has chosen things that deal with political and sexual revolution and that confront the disaster of global arms proliferation. In today's episode he considers the morality of modern global finance and its implication for the future. He tells the story with a credit card that is compliant with Islamic Sharia law - what does that mean and how does it work? He talks to the Governor of the Bank of England, Mervyn King, and to Razi Fakih of the HSBC bank. Producer: Anthony Denselow