welfare economics is the part of economics that uses microeconomic techniques, trying to resource allocation, while it will also consider the distributional effects . In this study, for changes in social welfare in Iran, we used the Lorenz curve and Gini coefficient. The period of time in this study was 1380s. Results showed an increase in welfare associated with the lack of equitable distribution of income, which is leads to a reduction in the welfare of the whole society. Then, recommended to improve income distribution by using management tools (targeted subsidies, price controls, social security) that it is can be a factor in increasing prosperity. Obviously, given the increasing income, regardless of income distribution, definitely; will diminish of economic growth.

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