S1 : Income inequality in less-developed countries is worse than most estimates.

S6 : The tax regime in these countries needs to be progressive and futuristic.

P :  There is a staggering level of difference between the income metrics and the actual income of the prosperous in such countries.

Q : The effective tax rates are not really progressive with regard to income.

R : They need to be reengineered to bring into the tax net the enormous sums of 'missing' income.

S : They are even less so with regard to wealth.