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Constructing the True Cost of Living Index From the Engel Curves of the Piglog Model

Vanessa Fry and Panos Pashardes
Journal of Applied Econometrics
Vol. 4, No. 1 (Jan. - Mar., 1989), pp. 41-56
Published by: Wiley
Stable URL: http://www.jstor.org/stable/2096489
Page Count: 16
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Constructing the True Cost of Living Index From the Engel Curves of the Piglog Model
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Abstract

This paper investigates the properties of the Tornqvist index and shows how this can be used to construct a true cost of living index from a simple system of Engel curves. This allows the substitution bias inherent in a fixed weight index to be estimated using the maximum degree of commodity disaggregation available in the data. Furthermore the proposed index can be decomposed to show the impact of inflation on households with different expenditure levels and household chararacteristics. An empirical application of the method is given, using data on UK food expenditures.

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