abstract: Chief Executive Officers (CEOs) whose observed personal option-holding patterns are not consistent with theoretical predictions are variously described as overconfident or optimistic. Existing literature demonstrates that the investment and financing decisions of such CEOs differ from those of CEOs who do not exhibit such behavior and interprets the investment and financing decisions by overconfident or optimistic CEOs as inferior. This paper argues that it may be rational to exhibit behavior interpreted as optimistic and that the determinants of a CEO’s perceived optimism are important. Further, this paper shows that CEOs whose apparent optimism results from above average industry-adjusted CEO performance in prior years make investment and financing decisions which are actually similar, and sometimes superior to, those of unbiased CEOs. / Dissertation/Thesis / Doctoral Dissertation Business Administration 2016

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本文利用國內投資人參與民國八十五年一月至八十九年四月間77家IPO競價拍賣的投標資料為樣本，來探討投資人過度自信以及自我歸因偏誤的情形。實證結果發現:過度自信假說於對個人投資人在初級市場的投資行為仍有適用，並且男女皆有過度自信的現象，但沒有足夠證據顯示男性較女性過度自信。最後當投資者上次報酬為正時，投資者會更積極的投標。而上次報酬為負時，對其下次投標標價的影響並不顯著。此點符合自我歸因假說的推論。