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Market Reform and Efficiency: The Case of KOSPI200 Options

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  • Heejin Yang
  • Doojin Ryu
  • Doowon Ryu

Abstract

The Korean government and exchange have identified a need to regulate excessive speculative trading and to protect domestic individual investors from foreign and professional traders. As such, they have proposed an options market reform that requires higher levels of margin accounts for options trading and that increases the basic options multipliers in the KOSPI200 options market. This study examines how this market reform affects the price disagreement and adjustment behaviors of the index options market. Our analyses indicate that the efficiency and information quality of out-of-the-money options trades have increased since the reform took effect.

Suggested Citation

  • Heejin Yang & Doojin Ryu & Doowon Ryu, 2018. "Market Reform and Efficiency: The Case of KOSPI200 Options," Emerging Markets Finance and Trade, Taylor & Francis Journals, vol. 54(12), pages 2687-2697, September.
    • Handle: RePEc:mes:emfitr:v:54:y:2018:i:12:p:2687-2697
    DOI: 10.1080/1540496X.2018.1496424
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    Cited by:

    1. Yang, Heejin & Kutan, Ali M. & Ryu, Doojin, 2019. "Volatility information trading in the index options market: An intraday analysis," International Review of Economics & Finance, Elsevier, vol. 64(C), pages 412-426.
    2. Joonhyuk Song & Doojin Ryu & Jinyoung Yu, 2023. "Changes in the options contract size and arbitrage opportunities," Journal of Futures Markets, John Wiley & Sons, Ltd., vol. 43(1), pages 122-137, January.
    3. Doojin Ryu & Doowon Ryu & Heejin Yang, 2021. "The impact of net buying pressure on index options prices," Journal of Futures Markets, John Wiley & Sons, Ltd., vol. 41(1), pages 27-45, January.
    4. Chun, Dohyun & Cho, Hoon & Ryu, Doojin, 2019. "Forecasting the KOSPI200 spot volatility using various volatility measures," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 514(C), pages 156-166.
    5. Sang Ik Seok & Hoon Cho & Chanhi Park & Doojin Ryu, 2019. "Do Overnight Returns Truly Measure Firm-Specific Investor Sentiment in the KOSPI Market?," Sustainability, MDPI, vol. 11(13), pages 1-14, July.
    6. Doojin Ryu & Jinyoung Yu, 2021. "Informed options trading around holidays," Journal of Futures Markets, John Wiley & Sons, Ltd., vol. 41(5), pages 658-685, May.
    7. Daehyeon PARK & Doojin RYU, 2021. "Forecasting Stock Market Dynamics using Bidirectional Long Short-Term Memory," Journal for Economic Forecasting, Institute for Economic Forecasting, vol. 0(2), pages 22-34, June.

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