What is the Social effect of Islamic Financial System ?

Simply, it is the justice. 

Islamic banking (Arabic: المصرفية الإسلامية‎, Persian: بانکداری اسلامی‎) is banking or banking activity that is consistent with the principles of sharia and its practical application through the development of Islamic economics. As such, a more correct term for 'Islamic banking' is 'Sharia compliant finance'.

Sharia prohibits acceptance of specific interest or fees for loans of money (known as riba, or usury), whether the payment is fixed or floating. Investment in businesses that provide goods or services considered contrary to Islamic principles (e.g. pork or alcohol) is also haraam ("sinful and prohibited"). Although these prohibitions have been applied historically in varying degrees in Muslim countries/communities to prevent unIslamic practices, only in the late20th century were a number of Islamic banks formed to apply these principles to private or semi-private commercial institutions within the Muslim community.

As of2005, sharia compliant financial institutions represented approximately0.5% of total world assets. By2009, there were over300 banks and250 mutual funds around the world complying with Islamic principles and as of2014 total assets of around $2 trillion were sharia-compliant. According to Ernst & Young, Islamic banking assets have been growing faster than banking assets as a whole, growing at an annual rate of17.6% between2009 and2013, and will grow by an average of19.7% a year to2018.