Water Resources Management

, Volume 27, Issue 13, pp 4559–4578 | Cite as

Economies of Scale, Scope, and Density in the Italian Water Sector: A Two-Stage Data Envelopment Analysis Approach

  • Andrea Guerrini
  • Giulia Romano
  • Bettina Campedelli
Article

Abstract

Public utilities could improve their efficiency by pursuing specific strategies, such as growth, diversification of investments, or serving mainly high densely areas. For example, in the water sector, economies of scope and scale both appear possible, but extant literature does not offer clear or consensual findings. To address this lack of clarity, this article investigates the potential for efficiency improvement in the diverse Italian water sector, which comprises utilities of various sizes, operating in areas with various population densities and organized as mono- or multi-utilities. Technical and financial data from 64 different utilities were collected and then analyzed with a two-stage data envelopment analysis approach to reveal the impacts of different operational and exogenous variables on efficiency, including firm size, the degree of investment diversification, and customer density. The results obtained confirm the existence of all three types of economies (scale, scope and density), albeit with different impacts for each DEA score.

Keywords

Water utility Efficiency Scale Scope Density Data envelopment analysis 

References

  1. Abbott M, Cohen B (2009) Productivity and efficiency in the water industry. Util Policy 17:233–244Google Scholar
  2. Aida K, Cooper WW, Pastor JT, Sueyoshi T (1998) Evaluating water supply services in Japan with RAM: a range-adjusted measure of inefficiency. OMEGA Int J Manag Sci 26(2):207–232CrossRefGoogle Scholar
  3. Alsharif K, Feroz EH, Klemer A, Raab R (2008) Governance of water supply systems in the Palestinian territories: a data envelopment analysis approach to the management of water resources. J Environ Manage 87:80–94CrossRefGoogle Scholar
  4. Aly HY, Grabowski R, Pasurka C, Rangan N (1990) Technical, scale and allocative efficiencies in US banking: an empirical investigation. Rev Econ Stat 72:211–218CrossRefGoogle Scholar
  5. Antonioli B, Fillipini M (2001) The use of a variable cost function in the regulation of the Italian water industry. Util Policy 10:181–187CrossRefGoogle Scholar
  6. Anwandter L, Ozuna T (2002) Can public sector reform improve the efficiency of public water utilities? Environ Dev Econ 7:687–700CrossRefGoogle Scholar
  7. Ashton J (1999) Economies of scale, economies of capital utilisation and capital utilisation in the English and Welsh water industry. Working Paper Series. Bournemouth University, UKGoogle Scholar
  8. Ashton J (2003) Capital utilization and scale in the English and Welsh Water Industry. Serv Ind J 23(5):137–149CrossRefGoogle Scholar
  9. Banker RD, Gifford JL (1988) A relative efficiency model for the evaluation of public health nurse productivity. Mellon University Mimeo, CarnegieGoogle Scholar
  10. Banker RD, Charnes A, Cooper WW (1984) Some models for estimating technical and scale inefficiencies in data envelopment analysis. Manag Sci 30(9):1078–1092CrossRefGoogle Scholar
  11. Baranzini A, Faust AK (2009) The cost structure of water utilities in Switzerland. Working Paper Cahier de recherche No HES-SO/HEG-GE/C--10/5/1--CH, Haute école de gestion de Genève CRAG, SwitzerlandGoogle Scholar
  12. Berg SV, Marques RC (2011) Quantitative studies of water and sanitation utilities: a literature survey. Water Policy 13(5):591–606CrossRefGoogle Scholar
  13. Bhattacharyya A, Harris T, Narayanan R, Raffiee K (1995) Specification and estimation of the effect of ownership on the economic efficiency of the water utilities. Reg Sci Urban Econ 25:759–784CrossRefGoogle Scholar
  14. Brockett PL, Golany B (1996) Using rank statistics for determining programmatic efficiency differences in data envelopment analysis. Manag Sci 42(3):466–472CrossRefGoogle Scholar
  15. Byrnes P, Grosskopf S, Hayes K (1986) Efficiency and ownership: further evidence. Rev Econ Stat 668:337–341CrossRefGoogle Scholar
  16. Byrnes J, Crase L, Dollery B, Villano R (2010) The relative economic efficiency of urban water utilities in regional New South Wales and Victoria. Resour Energy Econ 32(3):439–455CrossRefGoogle Scholar
  17. Carvalho P, Marques RC (2011) The influence of the operational environment on the efficiency of water utilities. J Environ Manage 92:2698–2707CrossRefGoogle Scholar
  18. Carvalho P, Marques RC, Berg S (2012) A meta-regression analysis of benchmarking studies on water utilities market structure. Util Policy 21:40–49CrossRefGoogle Scholar
  19. Caves WC, Christensen LR, Swanson JA (1981) Productivity growth, scale economies, and capacity utilization in U.S. railroads, 1955–74. Am Econ Rev 71:994–1002Google Scholar
  20. Charnes A, Cooper WW, Rhodes E (1978) Measuring the efficiency of decision making units. Eur J Oper Res 2:429–444CrossRefGoogle Scholar
  21. Chirkos TN, Sears AM (1994) Technical efficiency and the competitive behavior of hospitals. Socio Econ Plan Sci 28:219–227CrossRefGoogle Scholar
  22. Clark D (2000) Public service reform: a comparative west European perspective. West Eur Polit 23(3):25–44CrossRefGoogle Scholar
  23. Co.n.vi.r.i. (2009) Rapporto sullo stato dei servizi idrici. Commissione Nazionale di Vigilanza sulle Risorse Idriche, RomaGoogle Scholar
  24. Coelli TJ (1996) A guide to DEAP version 2.1: a data envelopment analysis (Computer) Program. CEPA Working Paper 96/8, Department of Econometrics, University of New England, Armidale NSW AustraliaGoogle Scholar
  25. Coelli T (1998) A multi-stage methodology for the solution of orientated DEA models. Oper Res Lett 23(3–5):143–149CrossRefGoogle Scholar
  26. Cruz NF, Marques RC (2011) Viability of municipal companies in the provision of urban infrastructure services. Local Gov Stud 37(1):93–110CrossRefGoogle Scholar
  27. Cruz NF, Marques RC, Romano G, Guerrini A (2012) Measuring the efficiency of water utilities: a cross-national comparison between Portugal and Italy. Water Policy 14(5):841–853CrossRefGoogle Scholar
  28. Cubbin J, Tzanidakis G (1998) Regression versus data envelopment analysis for efficiency measurement: an application to the England and Wales regulated water industry. Util Policy 7:75–85CrossRefGoogle Scholar
  29. De Witte K, Marques RC (2010) Designing performance incentives, an International benchmark study in the water sector. CEJOR 18:189–220CrossRefGoogle Scholar
  30. De Witte K, Marques RC (2011) Big and beautiful? On non-parametrically measuring scale economies in non-convex technologies. J Prod Anal 35:213–226CrossRefGoogle Scholar
  31. Dietsch M, Weill L (1999) Les performances des banques de dépots francaises: une evaluation par la méthod DEA. In: Badillo PY, Paradi JC (eds) La méthod DEA. Hermes Science Publications, ParisGoogle Scholar
  32. Estache A, Kouassi E (2002) Sector organization, governance and the inefficiency of African water utilities. World Bank Policy Research Working Paper, 2890. http://elibrary.worldbank.orgcontent/workingpaper/10.1596/1813-9450-2890. Accessed 2 Jan 2013
  33. Fabbri P, Fraquelli G (2000) Costs and structure of technology in the Italian water industry. Empirica 27:65–82CrossRefGoogle Scholar
  34. Filippini M, Hrovatin N, Zoric J (2008) Cost efficiency of Slovenian water distribution utilities: an application of stochastic frontier methods. J Prod Anal 29:169–182CrossRefGoogle Scholar
  35. Ford J, Warford J (1969) Cost functions for the water industry. J Ind Econ 18(1):53–63CrossRefGoogle Scholar
  36. Fox W, Hofler R (1985) Using homothetic composed error frontiers to measure water utility efficiency. South Econ J 53(2):461–477CrossRefGoogle Scholar
  37. Fraquelli G, Giandrone R (2003) Reforming the wastewater treatment sector in Italy: implications of plant size, structure and scale economics. Water Resour Res 39(10):1293CrossRefGoogle Scholar
  38. Fraquelli G, Moiso V (2005) Cost efficiency and economies of scale in the Italian water industry, SIEP. http://www-3.unipv.it/websiep/wp/420.pdf. Accessed 4 Jan 2013
  39. Fraquelli G, Piacenza M, Vannoni D (2004) Scope and scale economies in multi- utilities: evidence from gas, water and electricity combinations. Appl Econ 36(18):2045–2057CrossRefGoogle Scholar
  40. Garcia S, Thomas A (2001) The structure of municipal water supply costs: application to a panel of French local communities. J Prod Anal 16:5–29CrossRefGoogle Scholar
  41. Garcia S, Moreaux M, Reynaud A (2007) Measuring economies of vertical integration in network industries: an application to the water sector. Int J Ind Organ 25:791–820CrossRefGoogle Scholar
  42. Garcia-Sanchez I (2006) Efficiency measurement in Spanish local government: the case of municipal water services. Rev Policy Res 23(2):355–371CrossRefGoogle Scholar
  43. Gattoufi S, Oral M, Reisman A (2004) Data envelopment analysis literature: a bibliography update (1951–2001). Socio Econ Plan Sci 38:159–229CrossRefGoogle Scholar
  44. González-Gómez F, García-Rubio MA (2008) Efficiency in the management of urban water services. What have we learned after four decades of research? Hacienda Pública Esp 185(2):39–67Google Scholar
  45. González-Gómez F, García–Rubio MA, Alcalá-Olid F, Ortega-Díaz MI (2013) Outsourcing and efficiency in the management of rural water service. Water Resour Manag 27(3):731–747CrossRefGoogle Scholar
  46. Guerrini A, Romano G, Campedelli B (2011) Factors affecting the performance of water utility companies. Int J Public Sect Manag 24(6):543–566CrossRefGoogle Scholar
  47. Hayes K (1987) Cost structure of the water industry. Appl Econ 19:417–425CrossRefGoogle Scholar
  48. Hoff A (2007) Second stage DEA: comparison of approaches for modelling the DEA score. Eur J Oper Res 181:425–435CrossRefGoogle Scholar
  49. Hood C (1991) A public management for all seasons. Public Adm 69(1):3–19CrossRefGoogle Scholar
  50. Houtsma J (2003) Water supply in California: economies of scale, water charges, efficiency and privatization, ERSA Congress, August. http://www-sre.wu-wien.ac.at/ersa/ersaconfs/ersa03/cdrom/papers/379.pdf. Accessed 5 Jan 2013
  51. Hunt L, Lynk E (1995) Privatization and efficiency in the UK water industry: an empirical analysis. Oxf Rev Econ Stat 57(3):371–388CrossRefGoogle Scholar
  52. Kim HY (1987) Economies of scale in multi-product firms: an empirical analysis. Economica 54:185–206CrossRefGoogle Scholar
  53. Kim H, Clark R (1988) Economies of scale and scope in water supply. Reg Sci Urban Econ 27(2):163–183Google Scholar
  54. Kim E, Lee H (1998) Spatial integration of urban water services and economies of scale. Rev Urban Reg Dev Stud 10(1):1–18Google Scholar
  55. Kirkpatrick C, Parker D, Zhang YF (2006) State versus private sector provision of water services in Africa: an empirical analysis. World Bank Econ Rev 20(1):143–163CrossRefGoogle Scholar
  56. Knapp M (1978) Economies of scale in sewerage purification and disposal. J Ind Econ 27(2):163–183CrossRefGoogle Scholar
  57. Lynk E (1993) Privatisation, joint production and the comparative efficiencies of private and public ownership: the UK water industry case. Fisc Stud 14:98–116CrossRefGoogle Scholar
  58. Marques RC, De Witte K (2011) Is big better? On scale and scope economies in the Portuguese water sector. Econ Model 28(3):1009–1016CrossRefGoogle Scholar
  59. Martins R, Fortunato A, Coelho F (2006) Cost structure of the Portuguese water industry: a cubic cost function application, GEMF, 9. https://estudogeral.sib.uc.pt/bitstream/10316/11747/1/Cost%20Structure%20of%20the%20Portuguese%20Water%20Industry.pdf. Accessed 3 Jan 2013
  60. Massarutto A, Paccagnan V, Linares E (2008) Private management and public finance in the Italian water industry: a marriage of convenience? Water Resour Res 44:1–17CrossRefGoogle Scholar
  61. Mizutani F, Urakami T (2001) Identifying network density and scale economies for Japanese water supply organizations. Pap Reg Sci 80(2):211–230CrossRefGoogle Scholar
  62. Nauges C, Van den Berg C (2008) Economies of density, scale and scope in the water supply and sewerage sector: a study of four developing and transition economies. J Regul Econ 34(2):144–163CrossRefGoogle Scholar
  63. Osborne S (2006) The new public governance? Public Manag Rev 8(3):377–387CrossRefGoogle Scholar
  64. Panzar JC, Willig RD (1981) Economies of scope. Am Econ Rev 71(2):268–272Google Scholar
  65. Peda P, Grossi G, Liik M (2013) Do ownership and size affect the performance of water utilities? Evidence from Estonian municipalities. J Manag Governance 17(2):237–259CrossRefGoogle Scholar
  66. Ray SC (1991) Resource-use efficiency in public schools: a study of Connecticut data. Manag Sci 37:1620–1628CrossRefGoogle Scholar
  67. Renzetti S (1999) Municipal water supply and sewerage treatment: costs, prices and distortions. Can J Econ 32:689–704Google Scholar
  68. Renzetti S, Dupont D (2009) Measuring the technical efficiency of municipal water suppliers: the role of environmental factors. Land Econ 85(4):627–636Google Scholar
  69. Romano G, Guerrini A (2011) Measuring and comparing the efficiency of water utility companies: a data envelopment analysis approach. Util Policy 19(3):202–209CrossRefGoogle Scholar
  70. Romano G, Guerrini A, Vernizzi S (2013) Ownership, investment policies and funding choices of Italian water utilities: an empirical analysis. Water Resour Manag 27(9):3409–3419CrossRefGoogle Scholar
  71. Saal D, Parker D (2000) The impact of privatization and regulation on the water and sewerage industry in England and Wales: a translog cost function model. Manag Decis Econ 21(6):253–268CrossRefGoogle Scholar
  72. Saal D, Parker D, Weyman-Jones T (2007) Determining the contribution of technical efficiency and scale change to productivity growth in the privatized English and Welsh water and sewerage industry: 1985–2000. J Prod Anal 28:127–139CrossRefGoogle Scholar
  73. Sauer J (2005) Economies of scale and firm size optimum in rural water supply. Water Resour Res 41:1–13CrossRefGoogle Scholar
  74. Sexton TR, Sleeper S, Taggart RE Jr (1994) Improving pupil transportation in North Carolina. Interfaces 24:87–103CrossRefGoogle Scholar
  75. Shih JS, Harrington W, Pizer WA, Gillingham K (2006) Economies of scale in community water systems. J Am Water Works Assoc 98(9):100–108Google Scholar
  76. Shleifer A, Vishny RW (1994) Politicians and firms. Q J Econ 109:995–1025CrossRefGoogle Scholar
  77. Silvestre J (1987) Economies and diseconomies of scale. In: The new Palgrave: A Dictionary of economics, Palgrave Macmillan, London, pp 80–84Google Scholar
  78. Simar L, Wilson PW (2004) Performance of the bootstrap for DEA estimators and iterating the principle. In: Cooper WW, Seiford LM, Zhu J (eds) Handbook on data envelopment analysis. Kluwer Academic Publishers, Boston, pp 265–298 (Chapter 10)Google Scholar
  79. Simar L, Wilson PW (2007) Estimation and inference in two-sage semi-parametric models of production processes. J Econom 136:31–64CrossRefGoogle Scholar
  80. Stanton KR (2002) Trends in relationship lending and factors affecting relationship lending efficiency. J Bank Financ 26:127–152CrossRefGoogle Scholar
  81. Stolp C (1990) Strength and weaknesses of data envelopment analysis: an urban and regional perspective. Comput Environ Urban Syst 14:103–116CrossRefGoogle Scholar
  82. Stone and Webster Consultants for OFWAT (2004) Investigation into evidence for economies of scale in the water and sewerage industry in England and Wales: Final Report. http://www.ofwat.gov.uk/pricereview/pr04/rpt_com_econofscale.pdf. Accessed 2 Jan 2013
  83. Tania C, Marques R (2011) Performance of Portuguese water utilities: how do ownership, size, diversification and vertical integration relate to efficiency? Water Policy 13(3):343–361CrossRefGoogle Scholar
  84. Tasman ACIL (2007) Size and scope economies in water and wastewater services. Investigation Report. Economic Regulatory Authority, PerthGoogle Scholar
  85. Torres M, Morrison-Paul CJ (2006) Driving forces for consolidation or fragmentation of the US water utility industry: a cost function approach with endogenous output. J Urban Econ 59:104–120CrossRefGoogle Scholar
  86. Tupper H, Resende M (2004) Efficiency and regulatory issues in the Brazilian water and sewerage sector: an empirical study. Util Policy 12:29–40CrossRefGoogle Scholar
  87. Tynan N, Kingdom B (2005) Optimal size for utilities? Public policy for the private sector, Note number 283, World Bank. http://siteresources.worldbank.org/INTWSS/Resources/optimalsize.pdf. Accessed 4 Jan 2013
  88. Urakami T (2007) Economies of vertical integration in the Japanese water supply industry. Jahrb Reg 27(2):129–141CrossRefGoogle Scholar
  89. Zschille M, Walter M (2012) The performance of German water utilities: a (semi)-parametric analysis. Appl Econ 44(29):3749–3764CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • Andrea Guerrini
    • 1
  • Giulia Romano
    • 2
  • Bettina Campedelli
    • 1
  1. 1.Department of ManagementUniversity of VeronaVeronaItaly
  2. 2.Department of Economics and ManagementUniversity of PisaPisaItaly

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