There is only one proper answer to that question. If you ask a white person, what percentage of African Americans Should be Living in Your Neighborhood? The answer is 100%. If people are going to be non-discriminatory they aren’t paying any attention to it, and the answer is 100%. - George Akerlof on Thomas Schelling’s 1971 “Models of Segregation” research in which Schelling demonstrates that even a small preference for one’s neighbors (75%, 90%) leads to total segregation.

*personally I think the answer “it doesn’t matter” would be an acceptable answer as well

Schelling, Strategy, Industrial Organization – Explanation starts at 18:47