Bert M. Balk of the Rotterdam School of Management at Erasmus University reviews “The Index Number Problem: Construction Theorems”, by Sydney Afriat. The Econlit abstract of this book begins: “Presents a solution to the index number problem. Discusses the new formula; the power algorithm; combinatorics; consistency; and illustration. Includes a section on construction theorems that discusses the system of inequalities ars > xs − xr; the principles of choice and preference; utility construction revisited; the construction of separable utility functions from expenditure data; the connection between demand and utility; and revealed preference revealed.”