IDEAS home Printed from
   My bibliography  Save this paper

The Impact of Insider Trading on Forecasting in a Bookmakers' Horse Betting Market


  • Adi Schnytzer

    () (Department of Economics, Bar Ilan University)

  • Martien Lamers

    () (Department of Financial Economics, Ghent University)

  • Vasiliki Makropoulou

    () (Utrecht School of Economics, Utrecht University)


This paper considers the impact of insider trading on forecasting in a betting market when prices are set by bookmakers. We base our analysis on Schnytzer, Lamers and Makropoulou (2008) who showed that inside trading in the 1997-1998 Australian racetrack betting market represents somewhere between 20 and 30 percent of all trading in this market. They show that the presence of insiders leads opening prices to deviate from true winning probabilities. Under these circumstances, forecasting of race outcomes should take into account an estimate of the extent of insider trading per horse. We show that the added value of a measure of insider trading for profitable betting is sufficient to reduce the losses when only prices are taken into account. Since the only variables taken into account in either Schnytzer, Lamers and Makropoulou (2008) or this paper are price data, this is tantamount to a demonstration that the market is weak-form efficient.

Suggested Citation

  • Adi Schnytzer & Martien Lamers & Vasiliki Makropoulou, 2009. "The Impact of Insider Trading on Forecasting in a Bookmakers' Horse Betting Market," Working Papers 2009-11, Bar-Ilan University, Department of Economics.
  • Handle: RePEc:biu:wpaper:2009-11

    Download full text from publisher

    File URL:
    File Function: Working paper
    Download Restriction: no

    Other versions of this item:

    References listed on IDEAS

    1. Adi Schnytzer & Martien Lamers & Vasiliki Makropoulou, 2010. "Measuring the Extent of Inside Trading in Horse Betting Markets," Journal of Gambling Business and Economics, University of Buckingham Press, vol. 4(2), pages 21-41, September.
    2. Schnytzer, Adi & Shilony, Yuval, 1995. "Inside Information in a Betting Market," Economic Journal, Royal Economic Society, vol. 105(431), pages 963-971, July.
    3. Adi Schnytzer & Avichai Snir, 2008. "Herding in Imperfect Betting Markets with Inside Traders," Journal of Gambling Business and Economics, University of Buckingham Press, vol. 2(2), pages 1-15, September.
    4. Shin, Hyun Song, 1991. "Optimal Betting Odds against Insider Traders," Economic Journal, Royal Economic Society, vol. 101(408), pages 1179-1185, September.
    5. Shin, Hyun Song, 1993. "Measuring the Incidence of Insider Trading in a Market for State-Contingent Claims," Economic Journal, Royal Economic Society, vol. 103(420), pages 1141-1153, September.
    6. Hyun Song Shin, 2008. "Prices Of State Contingent Claims With Insider Traders, And The Favourite-Longshot Bias," World Scientific Book Chapters,in: Efficiency Of Racetrack Betting Markets, chapter 34, pages 343-352 World Scientific Publishing Co. Pte. Ltd..
    Full references (including those not matched with items on IDEAS)


    Citations are extracted by the CitEc Project, subscribe to its RSS feed for this item.

    Cited by:

    1. Sung, Ming-Chien & McDonald, David C.J. & Johnson, Johnnie E.V., 2016. "Probabilistic forecasting with discrete choice models: Evaluating predictions with pseudo-coefficients of determination," European Journal of Operational Research, Elsevier, vol. 248(3), pages 1021-1030.

    More about this item


    Access and download statistics


    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:biu:wpaper:2009-11. See general information about how to correct material in RePEc.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: (Department of Economics). General contact details of provider: .

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    If CitEc recognized a reference but did not link an item in RePEc to it, you can help with this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service hosted by the Research Division of the Federal Reserve Bank of St. Louis . RePEc uses bibliographic data supplied by the respective publishers.