Macropragmatics
It’s the dumb, big-picture reason why people in a country act like they all know the same secret, even if they never actually talked about it.
A whole nation’s people decide to wear matching outfits because a king’s dream said so.
Everyone in a country suddenly starts speaking in riddles because a prophet said the world was going to end.
An entire generation decides to stop using words because a teacher said it was too much effort.