the population into heterogeneous socio‐economic groups is proposed. The equitable tax
system is defined by the three axioms given by K akwani and L ambert in 1998 and, as they
suggest, inequity is evaluated by the negative influences on the redistributive effect of the tax
associated with axiom violations. Measuring the extent of axiom violations among
households belonging to different groups, we improve the K akwani and L ambert analysis …