It is the very rich who will do most to drive the market up, piling in their cash when they sniff recovery. Most of the extra 30,000 or so extra millionaires that the return of the good times will create are to come from the self-made and the elderly, says Datamonitor's £1995 report UK High Net Worth Customers. The next big thing in wealth management is 'the Muslim effect', where there is a 'huge' gap because few UK financial institutions bother with Sharia-compliant equity and mortgage products. Sharia, Muslim religious law, forbids financial transactions that can be classed as usurious.