A quasi-malmquist productivity index
Grifell i Tatjé, Emili (Universitat Autònoma de Barcelona. Departamtt d'Economia de l'Empresa)
Lovell, C. A. Knox (University of Georgia. Department of Economics)
Pastor, J. T. (Universidad de Alicante. Departamento de Estadística e Investigación Operativa)

Fecha: 1998
Resumen: The Malmquist productivity index is based on distance functions, which are reciprocals of radial Debreu-Farrell efficiency measures, and which have a number of desirable properties. Linear programming techniques are frequently employed to calculate the efficiency measures. However these techniques can leave slacks, which constitute a non-radial form of inefficiency which is not incorporated into the analysis. Thus a radial efficiency measure overstates true efficiency, the reciprocal distance function understates the distance to the relevant efficient subset, and the Malmquist productivity index is adversely affected, although in an analytically indeterminate direction. This has led us to consider a new definition of "one-sided" efficiency, and to develop a new nonradial efficiency measure which incorporates all slacks on the selected side. Replacing conventional radial efficiency measures with our new non-radial efficiency measures generates what we call a quasi Malmquist productivity index. We illustrate our quasi-Malmquist productivity index with an application to productivity change in Spanish banking.
Derechos: Tots els drets reservats
Lengua: Anglès.
Documento: article ; recerca ; acceptedVersion
Materia: Distance functions ; Malmquist productivity index ; Linear programming slacks
Publicado en: Journal of productivity analysis, Vol. 10 Núm. 1 (July 1998) , p. 7-20, ISSN 0895-562X



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