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- W2619045268 abstract "In a Semi-Strong Form (SSF) Efficient Market, asset prices should respond quickly and completely to the public release of new information. In the period from his election on 11/8/16 and his swearing in ceremony on 1/20/17, President-elect Trump posted numerous statements (‘tweets’) on his Twitter messaging service account that identified ten publicly traded firms. In the absence of new information, the Efficient Market Hypothesis (EMH) predicts that these announcements should have little or no price impact on the common stocks of these firms. Using standard event study methods, we find that positive (negative) content tweets elicited positive (negative) abnormal returns on the event date and virtually all of this effect is from the opening stock price to the close. Within five trading days, the CARs are no longer statistically significant. President-elect Trump’s tweets were associated with increases in trading volume and Google Search activity. Taken as a whole, the price and trading volume response, combined with Google Search activity is consistent with hypothesis that it was small/noise traders who were acting on President-elect Trump’s tweets and that their impacts were transitory." @default.
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- W2619045268 date "2017-01-01" @default.
- W2619045268 modified "2023-09-27" @default.
- W2619045268 title "Trump Tweets and the Efficient Market Hypothesis" @default.
- W2619045268 doi "https://doi.org/10.2139/ssrn.2973186" @default.
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