This function as in illustrated figure area between A and B is termed as a/an: (1) index of inequality. (2) Lorenz curve. (3) Pareto indicator. (4) Gini coefficient. (5) Marx-Engels curve.
![1878_Lorenz Curves and Gini Coefficients.png](https://secure.tutorsglobe.com/CMSImages/1878_Lorenz%20Curves%20and%20Gini%20Coefficients.png)
Can anybody suggest me the proper explanation for given problem regarding Economics generally?