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Unless you reach an economic moment where you can pay the same to a policeman in Sweden and a policeman in Greece there is never going to be a socioeconomic identity that would allow you to aggregate all these people in some sort of federation police force.

Why?

Localized pay has been a thing for literally centuries, across a wide swath of fields.

This is not about standardized pay, but about resource sharing.

Imagine a study about an uptick in a certain type of crime. Easier on one big force, than 20 little ones.