Just like any other group of people, the better you get along with each other, well -- the better you get along!
A group that treats each other respectfully is going to get along better than a group that's fighting all the time. A group that is interdependent and works for the group rather than being a gaggle of self-centered autonomous individuals who happen to share a body is going to work better together, rather than vying for time, competing with one another, becoming jealous of one another, etc.
The best way to look at this, both from an intrapersonal point of view and as a way to work with this in therapy is to view the internals as a family (you're about as stuck with one another as you are with birth or intentional external family members), and then to decide together what type of family you want to be -- do you want to be a family that functions well as a unit or do you want to be fighting with each other all the time?
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