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Abnormal Stock Returns and Public Policy: The Case of the UK Privatised Electricity and Water Utilities

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  • Antoniou, A
  • Barr, D G
  • Priestley, R

Abstract

In common with privatisation issues around the world, those of UK utilities have earned very high returns on a continuing basis. This presents an asset pricing puzzle and has been used as a justification for the imposition of a "windfall" tax. This paper presents a framework for analysing the composition of these returns and for judging the extent to which they can be regarded as abnormal. It provides evidence that even the existence of abnormal returns depends crucially on the assumptions made with regard to their measurement. A general model that allows for time variation in investors' perceptions of risk reveals that the extent of the abnormal returns is much smaller than first thought, being present in only very few companies. In most cases, the observed high stock returns appear to be a reward for bearing risk and should not be regarded as abnormal. Copyright @ 2000 by John Wiley & Sons, Ltd. All rights reserved.

Suggested Citation

  • Antoniou, A & Barr, D G & Priestley, R, 2000. "Abnormal Stock Returns and Public Policy: The Case of the UK Privatised Electricity and Water Utilities," International Journal of Finance & Economics, John Wiley & Sons, Ltd., vol. 5(2), pages 93-106, April.
    • Handle: RePEc:ijf:ijfiec:v:5:y:2000:i:2:p:93-106
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    Cited by:

    1. Roger Buckland & Julian Williams & Janice Beecher, 2015. "Risk and regulation in water utilities: a cross-country comparison of evidence from the CAPM," Journal of Regulatory Economics, Springer, vol. 47(2), pages 117-145, April.
    2. Rajibur Reza & Gurudeo Anand Tularam & Xiyang Li & Bin Li, 2022. "Investments in the Asian water sector: an analysis based on the DCC-GARCH model," Palgrave Communications, Palgrave Macmillan, vol. 9(1), pages 1-9, December.
    3. Reza, Rajibur & Tularam, Gurudeo Anand & Li, Bin, 2021. "A review of global research on private investment in the water sector," Utilities Policy, Elsevier, vol. 72(C).

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