假新闻效应如何在寡头垄断市场中传播--来自胰岛素市场的证据

IF 7.4 2区经济学 Q1 BUSINESS, FINANCE

Finance Research Letters Pub Date : 2024-12-10 DOI:10.1016/j.frl.2024.106644

Aniss Louchez

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引用次数: 0

摘要

本研究分析了 2022 年 11 月 11 日一个虚假 "认证 "推特账户谎称礼来公司将免费提供胰岛素事件的影响。我们研究了这一事件对胰岛素市场寡头垄断中竞争对手的溢出效应。我们的研究结果表明，虽然竞争对手受到了短期影响，但与礼来相比，这些影响较弱，持续时间也较短。在更广泛的制药行业内，溢出效应仅限于紧随其后。没有发现预期行为。影响仅限于美国证券交易所，表明欧洲市场没有溢出效应。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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How fake news effects spread in an oligopolistic market — Evidence from the insulin market

This study analyzes the impact of an event on November 11, 2022, when a fake “certified” Twitter account falsely claimed that Eli Lilly's insulin would be provided for free. We examine spillover effects on competitors within the insulin market oligopoly. Our findings reveal that while competitors experienced short-term impacts, these were weaker and of shorter duration compared to Eli Lilly. Spillovers within the broader pharmaceutical sector were limited to the immediate aftermath. No anticipatory behavior was detected. The effects were confined to American stock exchanges, suggesting an absence of spillovers in European markets.

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来源期刊

Finance Research Letters BUSINESS, FINANCE-

CiteScore

11.10

自引率

14.40%

发文量

863

期刊介绍： Finance Research Letters welcomes submissions across all areas of finance, aiming for rapid publication of significant new findings. The journal particularly encourages papers that provide insight into the replicability of established results, examine the cross-national applicability of previous findings, challenge existing methodologies, or demonstrate methodological contingencies. Papers are invited in the following areas: Actuarial studies Alternative investments Asset Pricing Bankruptcy and liquidation Banks and other Depository Institutions Behavioral and experimental finance Bibliometric and Scientometric studies of finance Capital budgeting and corporate investment Capital markets and accounting Capital structure and payout policy Commodities Contagion, crises and interdependence Corporate governance Credit and fixed income markets and instruments Derivatives Emerging markets Energy Finance and Energy Markets Financial Econometrics Financial History Financial intermediation and money markets Financial markets and marketplaces Financial Mathematics and Econophysics Financial Regulation and Law Forecasting Frontier market studies International Finance Market efficiency, event studies Mergers, acquisitions and the market for corporate control Micro Finance Institutions Microstructure Non-bank Financial Institutions Personal Finance Portfolio choice and investing Real estate finance and investing Risk SME, Family and Entrepreneurial Finance