Reactions of Thailand’s Stock Market to the 2020 U.S. Presidential Election

Abstract

The U.S. presidential election is one of the most important events in the world, to which the stock markets of other countries react. The 2020 U.S. presidential election was unique due to delayed vote counts, the incumbent president’s false election-fraud claims, and the violent riots at the U.S. Capitol Building. In this study, the reactions of Thailand’s stock market are examined using the event-conditioning method for event-study analyses. The sample period ranges from August 6, 2019, to January 28, 2021. The period overlaps the period of the COVID-19 pandemic and Thailand’s youth protest, thus constituting parameter-instability and confounding-event problems. This study relies on the international capital asset pricing model to mitigate the parameter-instability problem, as it constructs event-dummy control variables to resolve the confounding-event problem. The data comprises daily log returns of Morgan Stanley Global Investable Market Indices portfolios for Thailand and the world, in excess of the 1-month U.S. treasury bill rate. The reactions are found to be significant for the election, the final election results, and the presidential inauguration; they are non-significant for the Capitol riots and the incumbent president’s false claims. For the same events, there is dissimilarity between the reactions of the Thai and U.S. markets.