Mich. Comp. Laws § 33
Definitions. The definitions of this section shall apply to Section 25 through 32 of Article IX, inclusive.
"Total State Revenues" includes all general and special revenues, excluding federal aid, as defined in the budget message of the governor for fiscal year 1978-1979. Total State Revenues shall exclude the amount of any credits based on actual tax liabilities or the imputed tax components of rental payments, but shall include the amount of any credits not related to actual tax liabilities. "Personal Income of Michigan" is the total income received by persons in Michigan from all sources, as defined and officially reported by the United States Department of Commerce or its successor agency. "Local Government" means any political subdivision of the state, including, but not restricted to, school districts, cities, villages, townships, charter townships, counties, charter counties, authorities created by the state, and authorities created by other units of local government. "General Price Level" means the Consumer Price Index for the United States as defined and officially reported by the United States Department of Labor or its successor agency.
MCL 33