- Schools, colleges, and workplaces should worry of creating peer groups in which some people are isolated. However, they should also avoid creating a critical mass around certain type of person.
- Evidence does suggests that efforts to create interactions between lower and higher types ought to maintain continuity of types.
- Strong evidence that peer’s race, ethnicity, and income have only very slight effects once we have properly accounted for peers’ achievement. .
- Switching from race-based to income-based desegregation has at most very slight effects, reassignments mainly affected achievement through the redistribution of lower and higher achieving peers.
- Fears of racial, ethnic, and economic desegregation are overblown.