This chapter discusses accounting for inflation and changing prices. It covers inflation, price indexes, inflation accounting methods, income measurement systems, and Statements of Financial Accounting Standards (SFAS) No. 33. Under historical cost accounting, inflation can lead to financial statements that are not economically relevant or comparable. Price indexes measure inflation. Inflation accounting aims to translate historical costs into current purchasing power. SFAS No. 33 initially required supplementary inflation disclosures but requirements were later removed due to issues with understandability and usefulness.