Only few indices are decomposable. The most famous counter-example is the Gini index, the decomposition of which has, in most cases, a remainder term which is not directly interpretable. The most widely used decomposable index is the GE index. The Atkinson index is only indirectly decomposable. Atkinson and GE indices have different cardinalization functions but they are ordinally equivalent for cases α≤1 and ϵ=1−α since: