McKinsey report on the black - white wealth gap

https://www.mckinsey.com/industries/public-sector/our-insights/the-economic-impact-of-closing-the-racial-wealth-gap

This McKinsey report on the black - white wealth gap claims that the US economy would be 4-6% larger overall if that gap were closed. Causes of the gap are also discussed.

There is also a study mentioned/cited about how many in developed countries will be poorer than their parents.

https://www.mckinsey.com/~/media/McKinsey/Featured%20Insights/Employment%20and%20Growth/Poorer%20than%20their%20parents%20A%20new%20perspective%20on%20income%20inequality/MGI-Poorer-than-their-parents-Flat-or-falling-incomes-in-advanced-economies-Executive-summary.ashx