Philosophy
The Ontology of Social Institutions: Joint Intentions and Status Functions
Quick fact
Even a prisoner of war camp can have its own social institutions: a piece of chocolate might become currency, and a certain hut might be designated as the 'prison library'—all because the prisoners collectively accept these functions.
Why this is interesting
Have you ever wondered why a piece of paper is money, or why a certain person has the power to marry you? Their power and value exist, yet you can't see them—what makes them real?