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The Effect of Short Sale Constraint Removal on Volatility in the Presence of Heterogeneous Beliefs

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  • Alan Kraus
  • Amir Rubin

Abstract

We evaluate the effect of short sale constraint removal on a stock market. The intuition is derived from simple geometry. We show that the price curve as a function of the uncertain future payoff changes when investors are able to act on the belief that the price of the share is relatively high. In a very simple model we show that volatility can either increase or decrease, depending on the variability of news about final payoffs. As an empirical illustration, we consider data from the Israeli stock market. The data show that volatility increased following the initiation of index options, consistent with the fact that short sales were prohibited in Israel when index options were introduced.

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  • Alan Kraus & Amir Rubin, 2003. "The Effect of Short Sale Constraint Removal on Volatility in the Presence of Heterogeneous Beliefs," International Review of Finance, International Review of Finance Ltd., vol. 4(3‐4), pages 171-188, September.
    • Handle: RePEc:bla:irvfin:v:4:y:2003:i:3-4:p:171-188
    DOI: 10.1111/j.1468-2443.2005.00047.x
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    1. Leonid Kogan & Raman Uppal, "undated". "Risk Aversion and Optimal Portfolio Policies in Partial and General Equilibrium Economies," Rodney L. White Center for Financial Research Working Papers 13-00, Wharton School Rodney L. White Center for Financial Research.
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    1. Maoguo Wu & Hanyang Zhang & Kwok-Leung Tam, 2017. "Did the Introduction of Securities Margin Trading Decrease China¡¯s A-Share Market Volatility?," International Journal of Financial Research, International Journal of Financial Research, Sciedu Press, vol. 8(3), pages 135-141, July.
    2. Dufrénot, Gilles & Keddad, Benjamin, 2014. "Spillover effects of the 2008 global financial crisis on the volatility of the Indian equity markets: Coupling or uncoupling? A study on sector-based data," International Review of Financial Analysis, Elsevier, vol. 33(C), pages 17-32.
    3. Uwe Helmes & Julia Henker & Thomas Henker & Tom Smith, 2017. "Effect of the ban on short selling on market prices and volatility," Accounting and Finance, Accounting and Finance Association of Australia and New Zealand, vol. 57(3), pages 727-757, September.
    4. Larry Su & Elmina Homapour & Francisco Chiclana, 2022. "Short-Sale Constraints and Stock Prices: Evidence from Implementation of Securities Refinancing Mechanism in Chinese Stock Markets," Mathematics, MDPI, vol. 10(17), pages 1-21, September.
    5. Hansson, Fredrik & Rüdow Fors, Erik, 2009. "Get Shorty? - Market Impact of the 2008-09 U.K. Short Selling Ban," Working Papers in Economics 365, University of Gothenburg, Department of Economics.

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