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This paper examines how the largest stock market of the world, the U S , and particularly the S&P500 index, reacted during the COVID-19 outbreak (02 01 2020-30 04 2020) Using simple financial analysis procedures for our theoretical framework, we juxtapose the released news with the respective market performance in order to examine if the stock market always incorporated the available information in time We show that the market in some sub-periods was not moving as it was expected, and the runs-test statistically confirmed our assumptions that the US stock market was not always efficient during the COVID-19 outbreak The market’s behavior is unpredictable for a rational asset pricing model because as this paper shows even the simplest financial theories could explain rational behavior, but the market presented a different performance © 2020, Rimini Centre for Economic Analysis All rights reserved
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