Computes and decomposes Gini, Bonferroni and Zenga 2007 point and synthetic concentration indexes. Decompositions are intended: by sources, by subpopulations and by sources and subpopulations jointly. References, Zenga M. M.(2007) Zenga M. (2015) Zenga M., Valli I. (2017) Zenga M., Valli I. (2018) .