[22] L. J. Lau. Functional forms in econometric model building. In
Z. Griliches and M. D. Intriligator, editors, “Handbook of
Econometrics”, vol. 3, ch. 26, pp. 1515-1566. Elsevier, Amsterdam
(1986).
[23] A. Lewbel. Characterizing some gorman engel curves. Econometrica
55, 1451 - 1459 (1987).
[24] A. Lewbel. The rank of demand systems: Theory and nonparametric
estimation. Econometrica 59, 711-730 (1991).
[25] E. MURPHY and E. Garvey. Cost of living indices and flexible con-
sumption behaviour: A partial critique. A partial critique, Working
Paper Nr. 103, Department of Economics National University of Ireland
(2005).
[26] Statistisches Bundesamt. Wirtschaftsrechnungen: Einkommens-
und Verbrauchsstichprobe, Aufgabe, Methode und DurchfRhrung der
EVS 2003. Wiesbaden (2005).
[27] J. E. TRIPLETT. Should the cost-of-living index provide the conceptual
framework for a consumer price index? Economic Journal 111, 311-334
(2001).
[28] R. Turvey. True cost of living indexes. Paper presented at the 5th
meeting of the Ottawa Group (1999).
[29] P. VON DER LIPPE. “Index Theory and Price Statistics”. Peter Lang
Verlag, Frankfurt am Main (2007).
[30] A. ZELLNER. An efficient method of estimating seemingly unrelated
regressions and tests for aggregation bias. Journal of the American
Statistical Association 57, 348-368 (1962).
36