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Market Efficiency and Apparent Unit Roots: An Application to Exchange Rates

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  • MICHAEL BLEANEY

Abstract

Prices in efficient markets are influenced by trading based on past patterns in the series. This induces parameter instability and near‐random‐walk behaviour in any time‐series model of such data. Simulation results suggest that this parameter instability makes stationary series more likely to be erroneously classified as nonstationary, according to standard unit root or stationarity tests. It is shown that individual real exchange rate series appear individually non‐stationary, especially for tests based on a null of stationarity, even though they appear stationary when treated as a panel.

Suggested Citation

  • Michael Bleaney, 1998. "Market Efficiency and Apparent Unit Roots: An Application to Exchange Rates," The Economic Record, The Economic Society of Australia, vol. 74(225), pages 139-144, June.
    • Handle: RePEc:bla:ecorec:v:74:y:1998:i:225:p:139-144
    DOI: 10.1111/j.1475-4932.1998.tb01911.x
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    References listed on IDEAS

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    1. Kenneth Rogoff, 1996. "The Purchasing Power Parity Puzzle," Journal of Economic Literature, American Economic Association, vol. 34(2), pages 647-668, June.
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    6. Im, Kyung So & Pesaran, M. Hashem & Shin, Yongcheol, 2003. "Testing for unit roots in heterogeneous panels," Journal of Econometrics, Elsevier, vol. 115(1), pages 53-74, July.
    7. G. M. Grossman & K. Rogoff (ed.), 1995. "Handbook of International Economics," Handbook of International Economics, Elsevier, edition 1, volume 3, number 3.
    8. Jensen, Michael C., 1978. "Some anomalous evidence regarding market efficiency," Journal of Financial Economics, Elsevier, vol. 6(2-3), pages 95-101.
    9. Leybourne, S J & McCabe, B P M, 1994. "A Consistent Test for a Unit Root," Journal of Business & Economic Statistics, American Statistical Association, vol. 12(2), pages 157-166, April.
    10. Oh, Keun-Yeob, 1996. "Purchasing power parity and unit root tests using panel data," Journal of International Money and Finance, Elsevier, vol. 15(3), pages 405-418, June.
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    Cited by:

    1. Guneratne B Wickremasinghe & Jae H Kim, 2008. "Weak-Form Efficiency of Foreign Exchange Markets of Developing Economies," Journal of Emerging Market Finance, Institute for Financial Management and Research, vol. 7(2), pages 169-196, August.
    2. Guneratne Banda Wickremasinghe, 2004. "Efficiency Of Foreign Exchange Markets: A Developing Country Perspective," International Finance 0406004, University Library of Munich, Germany.
    3. Mahamuda Firoj & Sharmina Khanom, 2018. "Efficient Market Hypothesis: Foreign Exchange Market of Bangladesh," International Journal of Economics and Financial Issues, Econjournals, vol. 8(6), pages 99-103.
    4. Guneratne Banda Wickremasinghe, 2004. "Efficiency of the Foreign Exchange Market of Papua New Guinea During the Recent Float," International Trade 0406007, University Library of Munich, Germany.

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