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Intraday pattern in bid-ask spreads and its power-law relaxation for Chinese A-share stocks

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  • Xiao-Hui Ni

    (ECUST)

  • Wei-Xing Zhou

    (ECUST)

Abstract

We use high-frequency data of 1364 Chinese A-share stocks traded on the Shanghai Stock Exchange and Shenzhen Stock Exchange to investigate the intraday patterns in the bid-ask spreads. The daily periodicity in the spread time series is confirmed by Lomb analysis and the intraday bid-ask spreads are found to exhibit $L$-shaped pattern with idiosyncratic fine structure. The intraday spread of individual stocks relaxes as a power law within the first hour of the continuous double auction from 9:30AM to 10:30AM with exponents $\beta_{\rm{SHSE}}=0.19\pm0.069$ for the Shanghai market and $\beta_{\rm{SZSE}}=0.18\pm0.067$ for the Shenzhen market. The power-law relaxation exponent $\beta$ of individual stocks is roughly normally distributed. There is evidence showing that the accumulation of information widening the spread is an endogenous process.

Suggested Citation

  • Xiao-Hui Ni & Wei-Xing Zhou, 2007. "Intraday pattern in bid-ask spreads and its power-law relaxation for Chinese A-share stocks," Papers 0710.2402, arXiv.org.
    • Handle: RePEc:arx:papers:0710.2402
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    References listed on IDEAS

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    1. Gao-Feng Gu & Wei Chen & Wei-Xing Zhou, 2006. "Quantifying bid-ask spreads in the Chinese stock market using limit-order book data: Intraday pattern, probability distribution, long memory, and multifractal nature," Papers physics/0701017, arXiv.org, revised Mar 2007.
    2. Mike, Szabolcs & Farmer, J. Doyne, 2008. "An empirical behavioral model of liquidity and volatility," Journal of Economic Dynamics and Control, Elsevier, vol. 32(1), pages 200-234, January.
    3. G.-F. Gu & W. Chen & W.-X. Zhou, 2007. "Quantifying bid-ask spreads in the Chinese stock market using limit-order book data," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 57(1), pages 81-87, May.
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