Increased inequity results in lower growth anda poorer economy.
You assume inequality when it is an idiotic Marxist class warfare talking point? How liberal of you.
But those data are less useful because income group members change every year.
1) In summary, half of all of U.S. households move from one income quintile to a different income quintile every decade.
2) The average number of people with jobs in a top income quintile household is two, while a majority of bottom income quintile households have no one employed.
3) If there are two adult income earners in a household who are married, their incomes are combined on tax forms. This is very common among top quintile income households.
4) The lowest quintile households, however, include a lot more single-person households, or two unmarried working adults living together, and sharing expenses, but reporting their incomes to the IRS as if they were two separate households.
5) 75% to 80% of the actual income for bottom quintile households is transfer payments (aka “welfare”) that are not included in IRS income data.
(6) The IRS warns against comparisons of pre-1987 and post-1987 income data due to significant changes in the definition of adjusted gross income (AGI) that made top quintile households appear to have large reported income gains, when in fact there was no change to their income at all.
7) In addition to the AGI changes, large marginal tax rate reductions during the Reagan Administration caused another large change in tax reporting. This reporting change appeared to boost top quintile income, when in fact their incomes had not changed.
8) Lastly, income for the bottom quintile does not include welfare entitlement tranfer payments making them seem far poorer than they actually are.