A Methodology to Propose the X-Factor in the Regulated English and Welsh Water and Sewerage Companies
The purpose of this paper is to develop a methodology which can be used to set X-factor under price cap schemes, when the number of observations is limited. We firstly apply a panel index approach across Water and Sewerage companies (WaSCs) over time to decompose unit-specific index number based productivity growth as a function of the productivity growth achieved by benchmark firms, and the catch-up to the benchmark firm achieved by less productive firms. We then calculate the potential productivity catch-up of laggard firms and an estimate of how the top performing company improved its productivity over time (technical change). Both estimates are used to propose X-factor for the industry over a particular period. The results indicated that significant gains in productivity occurred after 2000, when Ofwat set tighter price cap reviews in order to pass previous productivity benefits to consumers. However, average WaSC still needs to improve its productivity towards the benchmark firm (reduce their costs in real terms) by 2.69%, while the most productive firm needs to continue to improve its productivity by 0.95% over a period of five years. This technique is of great interest to researchers who are interested in developing comparative performance measurement under regulation and setting appropriate regulated prices when sample sizes are extremely limited.
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- M C A S Portela & E Thanassoulis & A Horncastle & T Maugg, 2011. "Productivity change in the water industry in England and Wales: application of the meta-Malmquist index," Journal of the Operational Research Society, Palgrave Macmillan;The OR Society, vol. 62(12), pages 2173-2188, December.
- Robert J. Hill, 2004.
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- Hill, Robert J., 2003. "Constructing price indexes across space and time: the case of the European Union," GGDC Research Memorandum 200362, Groningen Growth and Development Centre, University of Groningen.
- Hill, Robert J., 2003. "Constructing price indexes across space and time: the case of the European Union," Research Report 03C20, University of Groningen, Research Institute SOM (Systems, Organisations and Management).
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