1. Introduction One of fundamental and best known rules of Sharia law is that financial institutions are forbidden to collect interest-based income. What is economic interest of transactions by these institutions? The answer lays in fact that Sharia law allows these institutions to collect income for services they provide, as well as for risk they take. In addition, these financial institutions have right to share profit of projects they have financed including undertaking any losses that would arise in case of so called bad investments or simply unsuccessfully realized projects. Hence, subjects of Islamic banking, just like all other financial institutions, developed a series of financial arrangements i.e. models of financing that enable them to secure income not in conflict with what Sharia law forbids. Although a certain number of models of financing, provided by these institutions, is almost identical to models of financing offered by classical subjects dealing with financing, there is a number of financial arrangements not offered by classical financial institutions, and they, on other hand, represent basic financial services offered by Islamic banks. Besides, a great number of these arrangements is criticized as they contain hidden interest-based income so there are still theoretical discussions about nature of their income. In any case, according to their concepts, current financial and economic crisis in recent years has endangered sustainability of classical transactions of financial institutions, so Islamic financial institutions are seen as providers of models of financing that could potentially ease problems immanent to happenings in crisis of world economy and finances. On other hand, there is a large Muslim population in western countries, who want to use financial services in accordance to principles of Sharia law and thus, practice of founding Islamic financial institutions in western non-Islamic countries is becoming more and more common. Thereby, it is necessary to establish legal nature of such transactions in accordance with legal theory and business practice in common law and civil law countries so that these transactions could be performed in third world countries and their obvious advantages utilized. 2. Notion of Interest and Ways of Overcoming its Prohibition Despite fact that interest is expressly prohibited by Koran and other sources of Sharia law, Islamic trade practice developed, which was later adopted by banks, various mechanisms of financing that bring different kinds of income only declaratively distinct from interest. There are numerous discussions on whether such income contains hidden elements of interest. Most sources determine that basic element of interest is increase of value of money during a time period, that is, it is considered that all forms of profit where this element is noticed should be forbidden. In other words, all forms of profit realized as the compensation for renouncing current consumption are not allowed. Sharia law recognizes two basic kinds of interest (riba): first kind is classical interest based on capital value increase, without taking any risks or providing any services, while second form of interest is, in fact, consequence of exchange of goods within different transactions. While first form of riba is forbidden by Koran, second is forbidden by Sunet. More exactly, Koran doesn't only refer to forbidding interest based on money lending but forbidding interest has a wider meaning. Namely, it is forbidden to realize income based on even returning lent goods in larger quantity or in value larger than of lent one. Furthermore, riba also means all income realized by artificially created shortage, income based on abuse of a dominant position, increase of product price on basis of different methods of payment, etc. …
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