This study aims to investigate the response of the MSCI ACWI (Morgan Stanley Capital International-all-country world index) stock market indices against the announcement of COVID-19 as a pandemic by the World Health Organization on March 11, 2020. By using the event study method, the pre-event, event and post-event reactions of leading stock market index returns of 22 developed countries were identified. The event study method assumes that the markets have semi-strong form effects. A semi-strong form efficient market characterizes a market in which all publicly available information on the prices of financial assets is given. According to the findings, there were high losses in all stock market indexes in all pre-event windows. Also, stock markets gave a strong negative reaction to the announcement of the pandemic in countries on the American continent on the day of the event, high average abnormal returns were not observed in the European and Asian markets, and in the post-event period, the markets were in a panic atmosphere for the first 5 days. However, it was found that the markets experienced a recovery in the longer event windows. At the regional level, it was concluded that Asian countries with the lower number of cases and deaths experienced less loss of return than European and American countries with higher number of cases and deaths. The results of the study support that the stock markets of developed countries are not efficient in a semi-strong form, considering the abnormal returns on and around the date when COVID-19 was declared a global epidemic (March 11, 2020).
Primary Language | Turkish |
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Journal Section | Articles |
Authors | |
Publication Date | November 30, 2021 |
Submission Date | March 31, 2021 |
Published in Issue | Year 2021 Volume: 39 Issue: Covid 19 Özel Sayısı |
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