縣市長選舉對股市之影響

The Impact of Mayoral Election on Taiwan's Stock Market

10.29416/JMS.202001_27(1).0001

陳怡諠(Yi-Shuan Chen)；許安儀(An-Yi Hsu)

縣市長選舉 ； 不確定訊息假說 ； 累積平均異常報酬 ； Mayoral Election ； Uncertain Information Hypothesis ； Cumulative Average Abnormal Returns

管理與系統

27卷1期（2020 / 01 / 01）

1 - 30

繁體中文

本文採用事件分析法，針對2005年起地方選舉制變革後，至2018年間之的六次縣市長、直轄市首長選舉結果，利用選前最後一次民調顯示執政黨席位的變化呈現有利與否，將樣本區分為高變化和低變化兩組，探討選舉結果對股市的影響。本文發現，不論選前最後民調對執政當局呈現有利或不利衝擊，選舉事件對投資人所產生之不確定性，終因選舉結果揭曉、不確定性降低，則選後事件期帶來顯著的正報酬，且整體事件期的報酬，高變化組明顯大於低變化組。此外，考慮選舉席位、選舉層級、選舉轄區範圍不同的選舉效應，結果發現僅有全國九合一大選的報酬明顯大於區域性的一般縣市長或直轄市選舉。最終檢驗九大產業的選舉報酬，除金融、水泥產業外，其餘七大產業股，在高變化組的選舉事件中，均產生顯著較高的累積異常報酬；而電子科技產業的報酬更超越大盤整體報酬率。此外，不論市值高低在高變化組下，均有較低變化組為高之報酬率。本文結果支持不確定訊息假說。

We use the event study approach to examine the impact of six direct mayoral elections from 2005 to 2018 on the Taiwan stock market. Based on whether the pre-election polls show an increase on seats or not for the ruling party, we separate all sample into high-variation and low-variation subsamples. We find a positive abnormal return during the post-election windows for the whole subsamples. However, the cumulative abnormal returns (CAR) are greater for the high-uncertainty subsamples than for the low-uncertainty subsamples as the prediction of the Uncertain Information Hypothesis. Moreover, based on jurisdictional area of mayoral elections, we divide them into the national election and the regional election and find that the national-election subsamples have the greater CAR during the during the whole 30-day window than the regional-election subsamples. Additionally, according to various industries, high-tech stocks have a greater CAR during the pre-to-post-election period than the market. We also find that the high-uncertainty subsamples have greater CAR not only for low-market-value-firms but for high-market-value firms. These findings are consistent with the Uncertain Information Hypothesis, suggesting that investors in Taiwan stock market have stronger reaction to high uncertainty than to low uncertainty.

1. 張倉耀,蘇志偉,張旭玲,朱曉萍(2006)。從展望理論看臺灣總統選舉對股票市場之效應分析。選舉研究，13(1)，87-118。
   連結：
2. 張貴婷,陳青浩,林明俊,隋安莉(2006)。總統及北高市長選舉事件對股市報酬率之影響。嘉南學報，32，350-363。
   連結：
3. 陳怡誼,卓翠月,白詩婷(2017)。總統選舉事件對股市之影響。選舉研究，24(1)，33-60。
   連結：
4. 黃旭輝,黃一祥,張志向(2011)。重大資本支出後的經營績效:成長機會與公司治理的角色。臺大管理論叢，22(1)，297-326。
   連結：
5. 蔡昕俞(2013)。臺灣總統大選與經濟成長的政治景氣循環─1996-2012。臺灣民主季刊，10(1)，1021-34。
   連結：
6. 謝文良,林苑宜(2012)。台灣股市之流動性共變現象。證券市場發展季刊，24(4)，135-186。
   連結：
7. Allvine, F. C.,O’Neill, D. E(1980).Stock Market Returns and the Presidential Election Cycle-Implications for Market Efficiency.Financial Analysts Journal,36(5),49-61.
8. Belo, F.,Gala, V. D.,Li, J.(2013).Government Spending, Political Cycles, and the Cross Section of Stock Returns.Journal of Financial Economics,107(2),305-324.
9. Białkowski, J.,Gottschalk, K.,Wisniewski, T. P.(2008).Stock Market Volatility around National Elections.Journal of Banking and Finance,32(9),1941-1953.
10. Brown, K. D.,Harlow, W. V.,Tinic, S. M.(1993).The Risk and Required Rate of Common Stock Following Major Price Innovations.Journal of Financial and Quantitative Analysis,28(1),101-116.
11. Brown, K. D.,Harlow, W. V.,Tinic, S. M.(1988).Risk Aversion, Uncertain Information, and Market Efficiency.Journal of Financial Economics,22(2),355-385.
12. Brown, S. J.,Warner, J. B.(1985).Using Daily Stock Returns: The Case of Event Studies.Journal of Financial Economics,14(1),3-31.
13. Carvalho, A.,Guimaraes, B.(2018).State-controlled Companies and Political Risk: Evidence from the 2014 Brazilian Election.Journal of Public Economics,159,66-78.
14. Döpke, J.,Pierdzioch, C.(2006).Politics and the Stock Market: Evidence from Germany.European Journal of Political Economy,22(4),925-943.
15. Gärtner, M.,Wellershoff, K. W.(1995).Is There An Election Cycle in American Stock Returns.International Review of Economics and Finance,4(4),387-410.
16. Gärtner, M.,Wellershoff, K. W.(1999).Theories of Political Cycles: Lessons from the American Stock Market.International Review of Economics,46(4),613-630.
17. Goodell, J. W.,Vähämaa, S.(2013).US Presidential Elections and Implied Volatility: The role of Political Uncertainty.Journal of Banking & Finance,37(3),1108-1117.
18. He, Y.,Lin, H.,Wu, C.,Dufrene, U. B.(2009).The 2000 Presidential Election and the Information Cost of Sensitive versus Non-sensitive S&P 500 Stocks.Journal of Financial Markets,12(1),54-86.
19. Hensel, C. R.,Ziemba, W. T.(1995).United States Investment Returns during Democratic and Republican Administrations, 1928–1993.Financial Analysts Journal,51(2),61-69.
20. Johnson, R. R.,Chittenden, W.,Jensen, G.(1999).Presidential Politics, Stocks, Bonds, Bills, and Inflation.Journal of Portfolio Management,26(1),27-31.
21. Knight, B.(2006).Are Policy Platforms Capitalized into Equity Prices? Evidence from the Bush/Gore 2000 Presidential Election.Journal of Public Economics,90(4-5),751-773.
22. Leblang, D.,Mukherjee, B.(2005).Government Partisanship, Elections, and the Stock Market: Examining American and British Stock Returns, 1930-2000.Journal of Political Science,49(4),780-802.
23. Li, J.,Born, J. A.(2006).Presidential Election Uncertainty and Common Stock Returns in the United States.Journal of Financial Research,29(4),609-622.
24. Mehdian, S.,Nas, T.,Perry, M. J.(2008).An Examination of Investor Reaction to Unexpected Political and Economic Events in Turkey.Global Finance Journal,18(3),337-350.
25. Myers, S.,Majluf, N.(1984).Corporate Financing and Investment Decisions When Firms Have Information That Investors Do Not Have.Journal of Financial Economics,13(2),187-221.
26. Niederhoffer, V.,Gibbs, S.,Bullock, J.(1970).Presidential Elections and the Stock Market.Financial Analysts Journal,26(2),111-113.
27. Nippani, S.,Arize, A. C.(2005).US Presidential Election Impact on Canadian and Mexican Stock Markets.Journal of Economics and Finance,29(2),271-279.
28. Nippani, S.,Medlin, W..B.(2002).The 2000 Presidential Election and the Stock Market.Journal of Economics and Finance,26(2),162-169.
29. Pantzalis, C.,Stangeland, D. A.,Turtle, H. J.(2000).Political Elections and the Resolution of Uncertainty: The International Evidence.Journal of Banking & Finance,24(10),1575-1604.
30. Riley, W. B.,Luksetich, W. A.(1980).The Market Prefers Republicans: Myth or Reality.Journal of Financial and Quantitative Analysis,15(3),541-560.
31. Santa-Clara, P.,Valkanov, R.(2003).The Presidential Puzzle: Political Cycles and the Stock Market.The Journal of Finance,58(5),1841-1872.
32. Scholes, M.,Williams, J. T.(1977).Eastimating Betas from Nonsynchronous Data.Journal of Financial Economics,5(3),173-196.
33. Wong, W,McAleer, M.(2009).Mapping the Presidential Election Cycle in US Stock Markets.Mathematics and Computers in Simulation,78(11),3267-3277.
34. 沈中華,李建然(2000).事件研究法：財務與會計實證研究必備.台北:華泰.
35. 徐清俊,于文燕(2005)。選舉事件對臺灣股市之影響。遠東學報，22(2)，231-250。
36. 溫育芳,趙珮伊(2008)。國內股市定錨效應之研究─以2008年總統大選期間為例。創新與管理，8(4)，101-137。