So, maybe the Euribor and Libor rates correspond to something, but we know for a fact that they do not always, or even usually, correspond to an actual transaction.

BBC: Inconvenient truths about Libor

Standard psychiatric diagnoses are notoriously invalid - they do not correspond to meaningful clusters of symptoms in the real world, despite the obvious importance that they should.

BBC: 'Grief and anxiety are not mental illnesses'