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."

Awesome book by Nobel price winning Thomas Schelling: Micromotive and Macrobheavior http://www.amazon.com/Micromotives-Macrobehavior-Thomas-C-Sc...