In-Group Favoritism

“A minimal boundary divides “us” from “them.” Sometimes that alone shifts the allocation.”

01 / PLAINLY

What it means, plainly

People can give a small advantage to those they see as part of their group, even when the division is arbitrary.

02 / CONTEXT

A little more

Group membership can favor evaluations or resources for people who share the category. Minimal-group experiments show that even arbitrary divisions can matter, although they do not always create hostility.

03 / WHY IT MATTERS

Why it matters

Irrelevant affiliations can seep into allocations, evaluations, or access to opportunities that should follow shared criteria.

04 / EXAMPLE

A familiar example

People randomly assigned to teams with no shared history may allocate slightly more points to their own team.

05 / LIMIT

What it does not mean

Favoring one's group does not necessarily mean disliking another, and the effect's strength depends on norms and context.

06 / NOTICE

Notice it in your day

For a small allocation, write the criteria before seeing names or teams. If possible, hide affiliation while applying those criteria.

FINAL NOTE

The idea worth keeping

When allocating opportunities, hide irrelevant affiliations and publish shared criteria before seeing candidates.

QUESTIONS / 02

Questions people still have

Does favoring one's group require hostility toward another?

No. An advantage for the in-group can appear without dislike of an out-group.

Can an invented division influence choices?

Yes. Minimal groups show that arbitrary categories can affect allocation, though norms and context shape the result.