Income disparity always goes up because inflation always goes up. Zero is zero at the low end. And the high end is tied to inflation. But if you want to know the truth, wealth should be calculated by the safety net and pensions. If free food and health care and income and pensions are given to people then they have wealth at the low end. Its just not counted. And the reason its provided in that way, is because the low end can’t manage wealth so they are given wealth in a manner that can’t be miss appropriated.
As long as there is inequality in ambition, there will be inequality in income.