A memo you can forward: why fertility matters, how this country compares with its neighbors, and how many working-age people versus retirees the pyramid already implies. Tick sections, park each chart next to the paragraph it belongs with, then generate — or start from blank headings and write it yourself. After that, every heading and paragraph is editable, and Expand / Tighten / Ask AI can rewrite one section at a time.
Japan is the textbook ultra-low, ultra-aged case: the 2040 workforce is mostly already born.
AI prose uses the same OpenAI key as Cohort — add billing credits at platform.openai.com if generate or Expand fails. Limited to a few memos per hour. You can always type over the text.
This briefing will cover
TFR has been far below replacement for decades; the pyramid is the exhibit.
Immigration is small relative to the gap. That is arithmetic, not a verdict on whether inflows should rise.
Prefecture maps show Tokyo versus the rest.
Working-age counts are modeled from today’s pyramid. 2040 taxpayers are mostly already born; TFR shows up around 2060.