At the national level, the US Bureau of Economic Analysis (BEA) produces updated national I-O tables and multipliers every five years. At a sub-national level, the IMPLAN model and the RIMS-II model are the two models which are most commonly used to estimate these impacts. RIMS was used for the Wisconsin study, while IMPLAN was used for the California study and was also a component of the broader TREDIS system used for the California and Chicago studies. Custom state-specific I-O models developed at universities were used for the Oklahoma and Georgia studies. .
