This paper develops the theory of economic price and quantity indicators, being the difference analogue of indexes. The properties of indicators and indexes are compared. Observable bounds for the indicators will be derived, as well as two exactness results for Bennet (1920)-type price and quantity indicators.

Bennet indicators, Difference measures, Price and quantity change,
Economic Theory
Erasmus Research Institute of Management

Balk, B.M, Färe, R, & Grosskopf, S. (2004). The theory of economic price and quantity indicators. In Economic Theory (Vol. 23, pp. 149–164). doi:10.1007/s00199-003-0364-5