The Dynamic Estimating Poverty line of Urban Income groups by Using Extended Linear Expenditure System (ELES) (Panel data Approach)

In this research have been studied the effectiveness of socio-demographic variable (includes people employed households, dwelling ownership, literacy level of heads of household and household size) on least subsistence and poverty line of Iranian urban income groups via Extended Linear Expenditure System (ELES) approach by Generalized Method of Moments (GMM) method by using Panel Data in 1982-2016 periods. The survey results show that household size is the most important effects to increase the least subsistence in all commodity groups. Survey the time series poverty line of income groups shows that poverty line in all courses is always rising. Its main cause is increase in inflation and changes in socio-demographics effects. On this basis, monthly poverty line in first income group in 1982 is 35,000 Rials and in 2016 is 18,000,000 Rials. While, monthly poverty line in tenth income group in 1982 is 83,000 Rials and in 2016 is 25,000,000 Rials. The average monthly poverty line in 2016 is 22,000,000 Rials. In other income groups poverty line has increased, too. The amount of the poverty line from revenue in the second and third income groups is average four and three times more, respectively and in the fourth and fifth and sixth income groups is average two times more and in the seventh and eighth income group is average similar and only the ninth and tenth income groups the poverty line is higher revenue.