The purpose of the present study is to demonstrate the role of management changes in post-Islamic Revolution Iran to provide better and more efficient services for people and more equitable distribution of income resources and opportunities among different social classes. Then the new public management system is pivotal in social justice. This fact is crystal-clear for all that management is an effective factor inincreasing social justice. However, this does not reveal all aspects of the issue because most financial tools and resources are in the hands of the government and these financial tools are only one of the elements of management system. Therefore,the importance of the management system in the reduction of class differences becomes clear. Thus, over the past 50 years, for most subsidies have been paid for goods and energy, and this has caused trouble for both the government and the nation for the reasons other than the financial pressures because great amounts of subsidies have been wasted by the rich classes. Asa result, the difference between the social classes have been increasing. Although the removal of subsidies can create problems for low caste in the short run, in the long run it can lead to optimum distribution of resources among all castes, bridging the class gaps,and development of economy.