In this document, the author compares institutional costs at higher education institutions in Illinois between 1958 and 1971. In order to do this, it was necessary to deflate 1971 dollar expenditures and express them in terms of 1958 dollars. Measured in 1958 dollars, expenditures have increased by 397% to $446.7 million using the Consumer Price Index (CPI) factor, and by 298% to $358.2 million using the Gross National Product Implicit Deflator for State and Local Government Purchases of Goods and Services (GNP) factor. Comparisons of cost and outputs are made for state colleges and universities and private institutions within the state. (HS)