Physics

Mid price

Price setting

Consumer price index (South Africa)

Producer price index

Agency (philosophy)

Epistemology

World Wide Web

Monetary policy

Philosophy

Wholesale price index

Econometrics

Economics

Microeconomics

Price index

Inflation (cosmology)

Index (typography)

Theoretical physics

Computer science

Monetary economics

Price level

American Economic Journal Economic Policy

This paper proposes a method for aggregating prices when retailers use periodic sales to price-discriminate amongst heterogeneous customers. In the motivating model, loyal customers buy one brand and do not strategically time purchases, while Bargain Hunters always pay the lowest price available, the “best price.” In the model, the best price is part of an exact price index. Accounting for the best price also substantially improves the empirical match between conventional price aggregation strategies and actual prices paid by consumers. The methodology improves inflation measurement while imposing little burden on the data-collection agency. (JEL C43, D12, E31, L13, L81, M31)

Best Prices: Price Discrimination and Consumer Substitution