Musharakah
\r\n'Musharakah' is a word of Arabic origin which  literally means sharing. In the context of business and trade it means a joint  enterprise in which all the partners share the profit or loss of the joint  venture. It is an ideal alternative for the interest-based financing with far  reaching effects on both production and distribution. 
\r\n    
\r\n  'Interest' predetermines a fixed rate of return on a loan advanced by the  financier irrespective of the profit earned or loss suffered by the debtor,  while Musharakah does not envisage a fixed rate of return. Rather, the return  in Musharakah is based on the actual profit earned by the joint venture. The  financier in an interest-bearing loan cannot suffer loss while the financier in  Musharakah can suffer loss, if the joint venture fails to produce fruits. Islam  has termed interest as an unjust instrument of financing because it results in  injustice either to the creditor or to the debtor. If the debtor suffers a  loss, it is unjust on the part of the creditor to claim a fixed rate of return;  and if the debtor earns a very high rate of profit, it is injustice to the  creditor to give him only a small proportion of the profit leaving the rest for  the debtor. 
\r\n  
\r\n  In the modern economic system, it is the banks, which advance depositors' money  as loans to industrialists and traders. If industrialists having only ten  million of their own, acquire 90 million from the banks and embark on a huge  profitable project, it means that 90% of the project has been created by the  money of the depositors while only 10% has been created by their own capital.  If this huge project brings enormous profits, only a small proportion i.e. 14  or 15% will go to the depositors through the bank, while the industrialists  whose real contribution to the project is not more than 10% will gain all the  rest. The industrialists take even this small proportion of 14 or 15% back,  because they include this proportion in the cost of their production. The net  result is that all the profit of the enterprise is earned by the persons whose  own capital does not exceed 10% of the total investment, while the people  owning 90% of the investment get no more than the fixed rate of interest which  is often repaid by them through the increased prices of the products. On the  contrary, if in an extreme situation, the industrialists go insolvent, their  own loss is no more than 10%, while the rest of 90% is totally borne by the  bank, and in some cases, by the depositors. In this way, the rate of  interest is the main cause for imbalances in the system of distribution, which  has a constant tendency in favour of the rich and against the interests of the  poor. 
\r\n  
\r\n  Conversely, Islam has a clear-cut principle for the financier. According to  Islamic principles, a financier must determine whether he is advancing a loan  to assist the debtor on humanitarian grounds or he desires to share his  profits. If he wants to assist the debtor, he should resist from claiming any  excess on the principal of his loan, because his aim is to assist him. However,  if he wants to have a share in the profits of his debtor, it is necessary that  he should also share him in his losses. Thus the returns of the financier in  Musharakah have been tied up with the actual profits accrued through the  enterprise. The greater the profit achieved by the enterprise, the higher the  rate of return to the financier. If the enterprise earns enormous profits, all  of it cannot be secured by the industrialist exclusively, but they will be  shared by the common people as depositors in the bank. In this way, Musharakah  has a tendency to favour the common people rather than the rich only.
Source:
\r\n  “Musharakah & Mudarabah” - Taqi Usmani