[cma]

This is a really good book about all kinds of similar situations:

Thomas Schelling: Micromotives and Macrobehavior

https://www.amazon.com/Micromotives-Macrobehavior-Thomas-C-S...

"In one famous example, Thomas C. Schelling shows that a slight-but-not-malicious preference to have neighbors of the same race eventually leads to completely segregated populations."

[airstrike]

Thanks for that rec. Added to my list!