Estimating Economies of Scale and Scope in the English and Welsh Water Industry Using Flexible Technology
Publication: Journal of Water Resources Planning and Management
Volume 143, Issue 10
Abstract
Estimating the presence of economies of scale and scope is essential to support restructuring policies aimed at increasing the efficiency of the water industry. This paper demonstrates the usefulness and advantages of using a flexible technology to estimate economies of scale and scope in the water industry. The empirical application focuses on the English and Welsh water and sewerage industry, where companies offer a variety of services; water and sewerage companies (WaSCs) and water-only companies (WoCs) are two common business models within the industry. In this paper and for the first time, a flexible technology model is estimated that allows for type-specific technologies using a quadratic cost function to analyze the cost properties of water companies providing different services. The results do not support a common technology for WaSCs and WoCs. Thus, a flexible technology approach may be preferred for a reliable analysis of cost properties of WaSCs and WoCs. The results also show that the existence of economies of scale for WaSCs and WoCs, as well as integration economies between water and sewerage services, could potentially create substantial cost savings. The methodology and results of this study are of great importance to both companies and regulators to facilitate informed decision making in terms of optimal industry configuration and possible unbundling reforms.
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References
Abbott, M., and Cohen, B. (2009). “Productivity and efficiency in the water industry.” Util. Policy, 17(3–4), 233–244.
Ananda, J. (2014). “Evaluating the performance of urban water utilities: Robust nonparametric approach.” J. Water Resour. Plann. Manage., 04014021.
Arocena, P., Saal, D. S., and Coelli, T. (2012). “Vertical and horizontal scope economies in the regulated U.S. electric power industry.” J. Ind. Econ., 60(3), 434–467.
Baumol, W., Panzar, J., and Willing, R. (1982). Contestable markets and the theory of industry structure, Harcourt Brace Jovanovich, New York.
Bottasso, A., and Conti, M. (2009a). “Price cap regulation and the Ratchet effect: A generalised index approach.” J. Productivity Anal., 32(3), 191–201.
Bottasso, A., and Conti, M. (2009b). “Scale economies, technology and technical change: Evidence from the English water only sector.” Reg. Sci. Urban Econ., 39(2), 138–147.
Bottasso, A., Conti, M., Piacenz, M., and Vannoni, D. (2011). “The appropriateness of the poolability assumption for multiproduct technologies: Evidence from the English water and sewerage utilities.” Int. J. Production Econ., 130(1), 112–117.
Carvalho, P., and Marques, R. C. (2016). “Estimating size and scope economies in the Portuguese water sector using the Bayesian stochastic frontier analysis.” Sci. Total Environ., 544, 574–586.
Correia, T., and Marques, R. C. (2011). “Performance of Portuguese water utilities: How do ownership, size, diversification and vertical integration relate to efficiency?” Water Policy, 13(3), 343–361.
Färe, R. (1986). “Addition and efficiency.” Quartely J. Econ., 101(4), 861–865.
Ford, J. L., and Wardford, J. J. (1969). “Cost functions for the water industry.” J. Ind. Economy, 18(1), 53–63.
Fraquelli, G., Piacenza, M., and Vannoni, D. (2005). “Cost savings from generation and distribution with an application to Italian electric utilities.” J. Regul. Econ., 28(3), 289–308.
Garcia, S., Moreaux, M., and Reynaud, A. (2007). “Measuring economies of vertical integration in network industries: An application to the water sector.” Int. J. Ind Organiz, 25(4), 791–820.
Guerrini, A., Romano, G., and Campedelli, B. (2013). “Economies of scale, scope, and density in the Italian water sector: A two-stage data envelopment analysis approach.” Water Resour. Manage., 27(13), 4559–4578.
Hayes, K. (1987). “Cost structure of the water utility industry.” Appl. Econ., 19(3), 417–425.
Hunt, C. L., and Lynk, E. L. (1995). “Privatisation and efficiency in the UK water industry: An empirical analysis.” Oxford Bull. Econ. Stat., 57(3), 371–388.
Lynk, E. L. (1993). “Privatization, joint production and the comparative efficiencies of private and public ownership: The UK water industry case.” Fiscal Studies, 14(2), 98–116.
Marques, R. C., Berg, S., and Yane, S. (2014). “Nonparametric benchmarking of Japanese water utilities: Institutional and environmental factors affecting efficiency.” J. Water Resour. Plann. Manage., 562–571.
Marques, R. C., and De Witte, K. (2011). “Is big better? On scale and scope economies in the Portuguese water sector.” Econ. Modell., 28(3), 1009–1016.
Martins, R., Coelho, F., and Fortunato, A. (2008). “Water losses and hydrographical regions influence on the cost structure of the Portuguese water industry.”, Universidade de Coimbra, Facultade de Economia, Grupo de Estudos Monetários e Financeiros, Coimbra, Portugal.
Maziotis, A., Saal, D. S., Thanassoulis, E., and Molinos-Senante, M. (2015). “Profit, productivity and price performance changes in the water and sewerage industry: An empirical application for England and Wales.” Clean Technol. Environ. Policy, 17(4), 1005–1018.
Maziotis, A., Molinos-Senante, M., and Sala-Garrido, R. (2017). “Document assesing the impact of quality of service on the productivity of water industry: A Malmquist-Luenberger approach for England and Wales.” Water Resour. Manage., 31(8), 2407–2427.
Maziotis, A., Saal, D. S., Thanassoulis, E., and Molinos-Senante, M. (2014). “Profit change and its drivers in the English and Welsh water industry: Is output quality important?” Water Policy, 18(4), 1–18.
Molinos-Senante, M., Maziotis, A., and Sala-Garrido, R. (2014). “The Luenberger productivity indicator in the water industry: An empirical analysis for England and Wales.” Util. Policy, 30(Sep), 18–28.
Molinos-Senante, M., Maziotis, A., Mocholi–Arce, M., and Sala-Garrido, R. (2016). “Accounting for service quality to customers in the efficiency of water companies: Evidence from England and Wales.” Water Policy, 18(2), 513–532.
Molinos-Senante, M., Maziotis, A., and Sala-Garrido, R. (2015). “Assessing the relative efficiency of water companies in the English and welsh water industry: A metafrontier approach.” Environ. Sci. Pollut. Res., 22(21), 16987–16996.
Nafi, A., and Kleiner, Y. (2010). “Scheduling renewal of water pipes while considering adjacency of infrastructure works and economies of scale.” J. Water Resour. Plann. Manage., 519–530.
Ofwat (Office of Water Services). (2010). “June reports for water and sewerage and water only companies in England and Wales.” ⟨http://www.ofwat.gov.uk/regulated-companies/company-obligations/performance/⟩.
Pulley, L. B., and Humphrey, D. B. (1993). “The role of fixed costs and cost complementarities in determining scope economies and the cost of narrow banking proposals.” J. Bus., 66(3), 437–462.
Ren, C., Guo, P., Yang, G., Li, R., and Liu, L. (2016). “Spatial and temporal analyses of water resources use efficiency based on data envelope analysis and Malmquist index: Case study in Gansu Province, China.” J. Water Resour. Plann. Manage., 04016066.
Romano, G., Guerrini, A., and Vernizzi, S. (2013). “Ownership, investment policies and funding choices of Italian water utilities: An empirical analysis.” Water Resour. Manage., 27(9), 3409–3419.
Saal, D. S., Arocena, P., Maziotis, A., and Triebs, T. (2013). “Scale and scope economies and the efficient vertical and horizontal configuration of the water industry: A survey of the literature.” Rev. Network Econ., 12(1), 93–129.
Saal, D. S., and Parker, D. (2001). “Productivity and price performance in the privatized water and sewerage companies in England and Wales.” J. Regulatory Econ., 20(1), 61–90.
Saal, D. S., and Parker, D. (2006). “Assessing the performance of water operations in the English and Welsh water industry: A lesson in the implications of inappropriately assuming a common frontier.” Performance measurement and regulation of network utilities, T. Coelli and D. Lawrence, eds., Edward Elgar, Cheltenham, U.K.
Saal, D. S., and Parker, D. S. (2000). “The impact of privatization and regulation on the water and sewerage industry in England and Wales: A translog cost function model.” Managerial Decision Econ., 21(6), 253–268.
Stone & Webster Consultants. (2004). “Investigation into evidence for economies of scale in the water and sewerage industry in England and Wales.”, Tennyson House, London.
Tovar, B., Jara-Diaz, S. R., and Trujillo, L. (2007). “Econometric estimation of scale and scope economies within the port sector: A review.” Marit. Policy Manag., 34(3), 203–223.
Triebs, T. P., Saal, D. S., Arocena, P., and Kumbhakar, S. C. (2016). “Estimating economies of scale and scope with flexible technology.” J. Productivity Anal., 45(2), 173–186.
Zellner, A. (1962). “An efficient method of estimating seemingly unrelated regressions and tests for aggregation bias.” J. Am. Stat. Assoc., 57(298), 348–368.
Information & Authors
Information
Published In
Journal of Water Resources Planning and Management
Volume 143 • Issue 10 • October 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Oct 11, 2016
Accepted: May 2, 2017
Published online: Jul 25, 2017
Published in print: Oct 1, 2017
Discussion open until: Dec 25, 2017
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