- Title Pages
- Preface
- Introduction
- I.1 About Choice
- I.2 Processes of Choice
- I.3 Democratic Choice
- I.4 Budget Allocation and Priority
- I.5 Ramsey's Savings Rule
- II.1 Utility Hypothesis
- II.2 Algebra of Revealed Preference
- II.3 Combinatorics of Demand
- II.4 Separable Utility
- II.5 Direct and Indirect Utility
- II.6 Efficiency and Inefficiency
- III.1 Price and Quantity Levels
- III.2 The True Index
- III.3 Fisher and Byushgens
- III.4 The Four‐Point Formula
- III.5 Wald's ‘New Formula’
- IV.1 Opportunity Models
- IV.2 Leontief's Input‐Output
- IV.3 The Market
- IV.4 Sraffa's Prices
- IV.5 General Economic Equilibrium
- IV.6 Von Neumann's Economic Model
- V.1 Optimal Programming
- V.2 Convex Programming
- V.3 Linear Programming
- V.4 Minimum Paths
- V.5 Distribution Matrices
- VI.1 Calculus of Propositions
- VI.2 Algebra of Relations
- VI.3 Intersections and Fixed Points
- Bibliography
- Index

# Wald's ‘New Formula’

# Wald's ‘New Formula’

- Chapter:
- (p.246) III.5 Wald's ‘New Formula’
- Source:
- Logic of Choice and Economic Theory
- Author(s):
### S. N. Afriat

- Publisher:
- Oxford University Press

This is the last of five chapters about the cost of living problem and price indices, a typical area for what is understood as choice theory. Together with the previous two chapters, it discusses theoretical matters arising from the finding of S. S. Byushgens (1925) that Irving Fisher's ‘Ideal Index’ is exact if demand is governed by a homogeneous quadratic utility. Specifically, it addresses the A. Wald's ‘New Formula’. The four sections of the chapter are: linear expansions; revealed purchasing power; yhe critical points; and marginal price indices and limits.

*Keywords:*
S. S. Byushgens, choice, choice theory, cost of living, demand, economic theory, Irving Fisher, Fisher's Ideal Index, four‐point formula, marginal price indices, price index, price theory, purchasing power

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- Title Pages
- Preface
- Introduction
- I.1 About Choice
- I.2 Processes of Choice
- I.3 Democratic Choice
- I.4 Budget Allocation and Priority
- I.5 Ramsey's Savings Rule
- II.1 Utility Hypothesis
- II.2 Algebra of Revealed Preference
- II.3 Combinatorics of Demand
- II.4 Separable Utility
- II.5 Direct and Indirect Utility
- II.6 Efficiency and Inefficiency
- III.1 Price and Quantity Levels
- III.2 The True Index
- III.3 Fisher and Byushgens
- III.4 The Four‐Point Formula
- III.5 Wald's ‘New Formula’
- IV.1 Opportunity Models
- IV.2 Leontief's Input‐Output
- IV.3 The Market
- IV.4 Sraffa's Prices
- IV.5 General Economic Equilibrium
- IV.6 Von Neumann's Economic Model
- V.1 Optimal Programming
- V.2 Convex Programming
- V.3 Linear Programming
- V.4 Minimum Paths
- V.5 Distribution Matrices
- VI.1 Calculus of Propositions
- VI.2 Algebra of Relations
- VI.3 Intersections and Fixed Points
- Bibliography
- Index