So the first condition is that the benefits of those inequalities be accessible to all and the second and perhaps most controversial part of Rawls" theory is that to the extent that there are inequalities in a society they should be distributed in such a way that they are to the benefit of the least well off, so if it turns out that having a lower tax rate in the highest bracket produces wealth and income in a way that leads those in the poorest quintile to benefit Rawls says that's okay, but if it turns out that that's advantageous only to those in the highest segment of society that inequality, says Rawls wouldn't be countenanced from behind the veil of ignorance. 