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Chinese Journal of Management Science ›› 2026, Vol. 34 ›› Issue (1): 60-71.doi: 10.16381/j.cnki.issn1003-207x.2024.0361

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Pre-Monetary Policy Announcement Drift of Stock Price: Formation Mechanism and Determinants

Yong Ma1, Li Chen1, Wei Chen2()   

  1. 1.College of Finance and Statistics,Hunan University,Changsha 410079,China
    2.School of management and Engineering,Capital University of Economics and Business,Beijing 100070,China
  • Received:2024-03-13 Revised:2024-10-23 Online:2026-01-25 Published:2026-01-29
  • Contact: Wei Chen E-mail:chenwei@cueb.edu.cn

Abstract:

In the context of the ongoing enhancement of policy communication by the People's Bank of China, exploring how the dissemination of monetary policy-related information impacts the capital market is crucial for mitigating systemic risks arising from information shocks. The formation mechanism and determinations behind stock price drift prior to the announcement of monetary policy are examined. Theoretically, within the framework of a continuous-time rational expectations model, public information—representing the central bank's communication—and the sensitivity of stock prices to monetary policy shocks are introduced to analyze the effects of private information, public information, and stock price sensitivity on the extent of stock price drift before announcements. Empirically, A-share non-financial industry data from 2010 to 2022 are used for analysis to validate the implications of the theoretical model. The findings indicate that when the precision of private information is higher or the precision of public information is lower, information asymmetry intensifies, resulting in a larger stock price drift. Mechanism analysis reveals that information asymmetry influences investors' information acquisition behavior, thereby contributing to stock price drift. Furthermore, moderating effect analysis demonstrates that the greater the sensitivity of stock prices to monetary policy shocks, the larger the stock price drift size resulting from information asymmetry.

Key words: information asymmetry, monetary policy announcement, stock price drift, rational expectations model

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