Data for this map categorizes states based on the statewide or local plans that do offer COLAs (e.g., Arizona's pension plan for state workers and teachers do not offer COLA benefits, but their retirement system for public safety does have a COLA linked to inflation). To understand which states have a mix of statewide and local plans with and without COLA rules, see this related map: https://datawrapper.dwcdn.net/mQrd5/1/.