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中国管理科学 ›› 2026, Vol. 34 ›› Issue (1): 41-59.doi: 10.16381/j.cnki.issn1003-207x.2024.0795cstr: 32146.14.j.cnki.issn1003-207x.2024.0795

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股价同步性——信息与噪声的统一框架

陈镇喜1(), 李京翰1, 张维2   

  1. 1.华南理工大学经济与金融学院,广东 广州 510006
    2.天津大学管理与经济学部,天津 300072
  • 收稿日期:2024-05-20 修回日期:2024-10-14 出版日期:2026-01-25 发布日期:2026-01-29
  • 通讯作者: 陈镇喜 E-mail:chenzx@scut.edu.cn
  • 基金资助:
    国家自然科学基金专项项目(72342022);国家社会科学基金项目(21BJY237);中央高校基本科研业务费专项资金项目(CXTD202407)

Stock Return Synchronicity: A Unified Framework of Information and Noise

Zhenxi Chen1(), Jinghan Li1, Wei Zhang2   

  1. 1.School of Economics and Finance,South China University of Technology,Guangzhou 510006,China
    2.College of Management and Economics,Tianjin University,Tianjin 300072,China
  • Received:2024-05-20 Revised:2024-10-14 Online:2026-01-25 Published:2026-01-29
  • Contact: Zhenxi Chen E-mail:chenzx@scut.edu.cn

摘要:

股价同步性的溯源问题是涉及资本市场效率测度有效性的重要议题。本文基于异质性投资者框架,从理论和实证角度探究微观、宏观层面的理性、非理性因素对股价同步性的影响。研究表明,公司特质信息的融入和个股非理性行为的增强都将弱化股价同步性。市场基本面信息的增加和市场非理性行为的增强将推升股价同步性,且高beta资产的股价同步性相对更高。股价同步性的丰富内涵意味着应用股价同步性测度市场效率是有条件的。以证券分析师的作用为例,本文进一步探讨应用股价同步性推断市场效率的有效性。本文表明证券分析师对股价同步性的缓解作用主要源于公司特质信息融入股价,但证券分析师也将推升部分个股非理性行为。本文基于股价同步性的组成部分重新构建市场效率指标,发现证券分析师能够增强公司特质信息对股价波动的驱动力,提升资本市场效率。本文对如何应用股价同步性度量资本市场配置资源的能力,增强股价同步性研究的现实意义提供了建议与指引。

关键词: 股价同步性, 基本面信息, 非理性行为

Abstract:

Clarifying the source of stock return synchronicity is pivotal in determining stock market efficiency. Existing literature on stock return synchronicity contains two strands. One believes that information determines the variation of stock return synchronicity, while the other posits that noise unrelated to information shapes stock return synchronicity. Despite such contradictive explanations, stock return synchronicity is driven by both micro-level and macro-level factors. The complexity and contradiction of stock return synchronicity incur difficulty in using stock return synchronicity as a market efficiency indicator. The source and the application of stock return synchronicity in a unified framework are addressed. Based on a heterogeneous agents model, the role of rational and irrational factors from micro and macro perspectives is theoretically formulized and empirically investigated in shaping stock return synchronicity. It is discovered that the reveal of firm-specific information and stock-level irrational behaviors alleviate stock return synchronicity. In addition, market-level fundamental information and irrational noise trading intensify stock return synchronicity while high-beta stocks possess higher stock return synchronicity. The complexity of stock return synchronicity suggests that stock return synchronicity and market efficiency are interchangeable only with additional conditions. The effectiveness of interpreting stock return synchronicity as a market efficiency indicator is discussed by investigating the role of stock analysts. It is shown that the alleviation of stock return synchronicity by stock analysts is primarily driven by the reveal of firm-specific information. However, stock analysts fuel irrational behaviors as well. A market efficiency indicator is reconstructed by reorganizing the rational and irrational components of stock return synchronicity. In general, stock analysts improve market efficiency. The guidance and suggestions are provided for applying stock return synchronicity to measure market efficiency and for enhancing the practical significance of stock return synchronicity.

Key words: stock return synchronicity, fundamental information, irrational behavior

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