We must have greater income equally!
Why wealth inequality matters scientifically was shown in a study in 2003 how genes and environment interact to influence IQ.
The study involved twins of both identical and fraternal assessing the relationship between socioeconomic status and IQ.
Among lower socioeconomic status 60% of the variability in children’s IQ was attributed to the poor economic environment.
Whereas in the affluent environment the variability in children’s IQ did not have that great of an effect.
https://www.psychologytoday.com/files/u81/Turkheimer_et_al___2003_.pdf