The Civilopedia tells you that Housing is needed for growth. It does not explain the diminishing returns of the growth formula.
refers to the comprehensive release of Sid Meier’s turn-based strategy masterpiece by the scene group CODEX. This specific release is well-known for bundling the base game with its massive catalog of expansions and DLC, providing a "one-stop" installation for the full 4X experience. Core Content and Expansions civilization vi codex