Last September, as dust and debris from the tellers’ floors began raining onto the empty vaults below, a note of satisfaction was sounded by bankers in the Arab world. Financial institutions sticking to the tenets of Islam, they announced, were largely immune from the debt crisis. Devout Muslims may lend and borrow under certain conditions; they can even buy and sell debt in the form of ‘Islamic’ bonds, but most other kinds of debt trading are frowned on. Al Rajhi Bank, based in Saudi Arabia, and the Kuwait Finance House posted impressive profits in 2008. Both have come under some nervous scrutiny in 2009 but their ability to weather the recession that has set in behind the credit crunch is not at issue.