The whole notion of applying sharia to any aspect of life is flawed and based on a misunderstanding of human nature: that all law has to have a divine origin in the Quran and the Ahadith. Man is a rational animal and reason has to govern the everyday aspects of life and not a top down system based on a dubious revelation by Allah in the 7th century. The notion that human reason is not capable of making laws and adapting them to the changing circumstances o the ages is not only false but also excessively cumbersome as the effort at deriving laws from the Quran and the Ahadith and analogy, is just an excessive waste of time and effort, as it is not possible to imagine that the creators of sharia in the 8th and 9the centuries were able to foresee all the complexities of modern finance.