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Price clustering in the CAC 40 index options market


  • Gunther Capelle-Blancard

    () (CES - Centre d'économie de la Sorbonne - CNRS - Centre National de la Recherche Scientifique - UP1 - Université Panthéon-Sorbonne)

  • Mo Chaudhury

    (Faculty of Management, McGill University - Université de Lille, Sciences Humaines et Sociales)


We examine in details the pattern and systematic tendencies of clustering in CAC 40 index option transaction prices during the 1997-1999 period. Similar to extant studies in many financial markets, there is evidence of strong clustering at full index points and option prices are 90% more likely to end with the digit 0 (multiples of 10) than with the digit 5. While the 1999 contract downsizing led to some reduction in clustering at full index point, the basic pattern of clustering remains intact. The pattern of clustering rejects the attraction theory, but is consistent with the notion of cost recovery by market makers. We find important drivers for CAC 40 index option price clustering, namely, the level of option premium, option volume and underlying asset volatility. Higher premium level, higher asset volatility and lower volume are seen to increase option price clustering. We also observe a U-shaped pattern of clustering on an intraday and intra-year basis. The option premium and volatility effects are consistent with a price level effect. The volatility effect also lends support to the notion of cost recovery by market makers. The volume effect likely represents a liquidity effect and is consistent with the Price Precision Hypothesis.

Suggested Citation

  • Gunther Capelle-Blancard & Mo Chaudhury, 2007. "Price clustering in the CAC 40 index options market," Université Paris1 Panthéon-Sorbonne (Post-Print and Working Papers) halshs-00265668, HAL.
  • Handle: RePEc:hal:cesptp:halshs-00265668
    DOI: 10.1080/09603100600949218
    Note: View the original document on HAL open archive server:

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    Cited by:

    1. Narayan, Paresh Kumar & Smyth, Russell, 2013. "Has political instability contributed to price clustering on Fiji's stock market?," Journal of Asian Economics, Elsevier, vol. 28(C), pages 125-130.
    2. Narayan, Paresh Kumar & Narayan, Seema & Popp, Stephan & D'Rosario, Michael, 2011. "Share price clustering in Mexico," International Review of Financial Analysis, Elsevier, vol. 20(2), pages 113-119, April.
    3. Alain François-Heude & Ouidad Yous, 2014. "On the liquidity of CAC 40 index options Market," Working Papers 2014-445, Department of Research, Ipag Business School.

    More about this item


    Clustering; Index Option; CAC 40; Tick; MONEP; Euronext;


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