Analysing the behavioural finance impact of 'fake news' phenomena on financial markets: a representative agent model and empirical validation
Open Access
- 5 July 2021
- journal article
- research article
- Published by Springer Science and Business Media LLC in Financial Innovation
- Vol. 7 (1), 1-30
- https://doi.org/10.1186/s40854-021-00271-z
Abstract
This paper proposes an original behavioural finance representative agent model, to explain how fake news’ empirical price impacts can persist in finance despite contradicting the efficient-market hypothesis. The model reconciles empirically-observed price overreactions to fake news with empirically-observed price underreactions to real news, and predicts a novel secondary impact of fake news: that fake news in a security amplifies underreactions to subsequent real news for the security. Evaluating the model against a large-sample event study of the 2019 Chinese ADR Delisting Threat fake news and debunking event, this paper finds strong qualitative validation for its model’s dynamics and predictions.Keywords
This publication has 18 references indexed in Scilit:
- Event Study Testing with Cross-sectional Correlation of Abnormal ReturnsThe Review of Financial Studies, 2010
- Event Studies for Merger Analysis: An Evaluation of the Effects of Non-Normality on Hypothesis TestingSSRN Electronic Journal, 2006
- A Unified Theory of Underreaction, Momentum Trading, and Overreaction in Asset MarketsThe Journal of Finance, 1999
- The weighing of evidence and the determinants of confidenceCognitive Psychology, 1992
- Ease of retrieval as information: Another look at the availability heuristic.Journal of Personality and Social Psychology, 1991
- Ease of retrieval as information: Another look at the availability heuristic.Journal of Personality and Social Psychology, 1991
- Using daily stock returns: The case of event studiesJournal of Financial Economics, 1985
- Conservatism in human information processingPublished by Cambridge University Press (CUP) ,1982
- Corporate Forecasts of Earnings Per Share and Stock Price Behavior: Empirical TestJournal of Accounting Research, 1976
- Efficient Capital Markets: A Review of Theory and Empirical WorkThe Journal of Finance, 1970