I think bookkeeping may be a related catalyst. But it's primary use seems more for inter-societal trade (settling accounts), than intra-societal education. Boo

I think bookkeeping may be a related catalyst. But it's primary use seems more for inter-societal trade (settling accounts), than intra-societal education. Bookkeeping is not the only prerequisite for written language, e.g. in the new world, sophisticated bookkeeping mechanisms existed for centuries without written language.