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Which way does water flow? An econometric analysis of the global price integration of water stocks

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  • Eduardo Roca
  • Gurudeo Anand Tularam

Abstract

Around US$600 billion of investment is desperately needed to address forecasted huge shortages in water supply globally. A number of worldwide investors -- so-called water funds -- have started to take up this challenge. For these global water investors, knowledge about the extent of integration between the water sectors of financial markets is highly important. According to international portfolio diversification theory, the less (more) integrated markets are, the more (less) benefits there are from international diversification. In this study, we investigate the extent and manner of interdependence among the US, European and Asian water sector of the equity markets based on Vector Autoregression (VAR), Granger causality and impulse response analyses. We find that world water stock market prices are indeed significantly interdependent although this interdependence varies across time periods. Each market quickly responds to shocks from each other and completes its response within 3 days. Hence, for water investors, international diversification that is undertaken just within the water sector will not be beneficial. The result also implies that there is the risk of crossmarket contagion -- that is, price volatility spill over across water sectors of different financial markets, and therefore, water authorities in one market should take cognisance of events in other markets.

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  • Eduardo Roca & Gurudeo Anand Tularam, 2012. "Which way does water flow? An econometric analysis of the global price integration of water stocks," Applied Economics, Taylor & Francis Journals, vol. 44(23), pages 2935-2944, August.
    • Handle: RePEc:taf:applec:44:y:2012:i:23:p:2935-2944
    DOI: 10.1080/00036846.2011.568403
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    Cited by:

    1. Gurudeo Anand Tularam & Rajibur Reza, 2016. "Water exchange traded funds: A study on idiosyncratic risk using Markov switching analysis," Cogent Economics & Finance, Taylor & Francis Journals, vol. 4(1), pages 1139437-113, December.
    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. Nader Trabelsi & Aviral Kumar Tiwari & Buhari Dogan, 2024. "Water and Emerging Energy Markets Nexus: Fresh Evidence from Advanced Causality and Correlation Approaches," Energies, MDPI, vol. 17(13), pages 1-22, June.
    4. Piñeiro-Chousa, Juan & López-Cabarcos, M.Ángeles & Ribeiro-Soriano, Domingo, 2020. "Does investor attention influence water companies’ stock returns?," Technological Forecasting and Social Change, Elsevier, vol. 158(C).
    5. Tiwari, Aviral Kumar & Adewuyi, Adeolu O. & Adeleke, Musefiu Adebowale & Abakah, Emmanuel Joel Aikins, 2023. "A time-varying Granger causality analysis between water stock and green stocks using novel approaches," Energy Economics, Elsevier, vol. 126(C).
    6. de Bonviller, Simon & Wheeler, Sarah Ann & Zuo, Alec, 2020. "The dynamics of groundwater markets: Price leadership and groundwater demand elasticity in the Murrumbidgee, Australia," Agricultural Water Management, Elsevier, vol. 239(C).
    7. 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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