Exact and inexact decompositions of trade price indices

Andreas Benedictow and Pål Boug ()
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Andreas Benedictow: Housing Lab, Oslo Metropolitan University
Pål Boug: Statistics Norway, Research Department

Empirical Economics, 2022, vol. 62, issue 4, No 16, 1994 pages

Abstract: Abstract A reasonable concept for the true trade price index in situations where low-price countries capture market shares from high-price countries is the average price paid by importers for the same quality of good or service from all exporting countries. However, decompositions of trade price indices are usually inexact in the sense that the average price used as the underlying aggregator formula is not exactly reproduced. In this paper, we compare analytically exact and inexact decompositions of trade price indices, paying particular attention to the bias in aggregate inflation occurring from applying the first-order Taylor series approximation and not the quadratic approximation lemma to a geometric average price. Our calculations, using the Norwegian clothing industry as an illustration, reveal that the bias in aggregate inflation over the sample period of 1997–2016 is quite substantial and as much as 0.6 percentage point in some years. We therefore conclude that the quadratic approximation lemma should be used in practice to exactly reproduce the underlying aggregator formula.

Keywords: Trade price indices; Exact and inexact decompositions; First- and second-order Taylor series approximations; Quadratic approximation lemma; Bias in aggregate inflation; C43; E31; F14 (search for similar items in EconPapers)
Date: 2022
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DOI: 10.1007/s00181-021-02078-4

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