本文蒐集1995年到2014年共計39家航空公司的避險數據，旨在檢視燃油避險、外匯避險和利率避險對於公司價值的影響。實證結果與多數文獻的結果一致，燃油和外匯避險對於公司價值多有顯著的正面影響。北美洲地區是唯一外匯避險有顯著負面影響的子樣本。至於利率避險在總樣本和多數的子樣本中對公司價值有顯著負面的影響。因此，本文認為避險與公司價值無絕對的關係，主要仍是取決於公司所面臨的風險。另外，經理人持股對於隔年燃油避險比率有正向關係，但不顯著。而不論燃油和外匯避險對於聯貸利率皆無顯著的關係。 / Using a sample of 39 airline companies around the world over period 1995 to 2015 to examine whether jet fuel hedging, currency hedging and interest rate hedging increase the firm value of airline companies. We find that jet fuel and currency hedging is significantly positively related to their firm value holds in various sub-samples and total sample, but North American area is only one sub-sample which have negative relationship between currency hedging and firm value. However, interest rate hedging have significantly negatively impact on various sub-samples and total sample. Based on our result, there is no absolutely negative or positive relationship between hedging and firm value, it depend on which risk the firm faced and should be hedged. Furthermore, CEO shares holding have non-significant positively relationship with hedge ratio. Our result also show there are no effect of hedging on reducing interest rate of syndicate loan.

Anand M. Goel and Anjan V Thakor 於最近的財務學刊中提出理性且風險趨避的經理人會放棄部分正報酬但風險高的投資，造成投資不足問題，使得公司價值未能極大化。然而，極端過度自信的經理人投資正負報酬皆有的計畫，造成過度投資，使得公司價值遞減。只有中度自信的經理人能為公司價值帶來極大化效果。本篇研究採用台灣上市櫃公司近二十年資料，以公司經理人對公司持股的變化來衡量其過度自信的程度，探討公司經理人自信程度對公司獲利能力與公司價值的影響。實證研究發現，極端過度自信的經理人與極端保守的經理人使公司的績效與成長性減少，降低公司價值。此研究增加我們了解經理人自有特徵對公司價值的影響，並為公司理財課題帶來新的貢獻。 / Former literature theorized that excessively overconfident CEOs and excessively diffident CEOs reduce the firm value for underinvestment and overinvestment problems and moderate overconfident CEOs willing to take risky but positive NPV projects increase the firm value. This paper conducts an empirical research by using the change of purchase and sale on own company stocks took by CEOs to measure CEO overconfidence level in Taiwanese listing companies and find that the profitability and stock performance of firms led by excessively overconfident CEOs and excessively diffident CEOs decrease compared to by moderate overconfident CEOs. The result contributes to the understanding of the impact on firm valuation by CEO idiosyncratic characteristics and offers new evidence to behavior finance on corporate management.

隨著國內外相關弊案的爆發，「公司治理」近幾年來一直是企業相當重視的議題。除了由於受到國際環境變化劇烈所影響之外，公司治理也與整體企業監控制度有密切之關聯。在國內外有相當多的學者從不同角度進行公司治理的相關的研究，而主管機關如金管會、證交所等也陸續制定相關的措施，希望能夠盡最大的力量來保障投資人的權益。 本研究主要是藉由公司治理的主要變數來探討企業購併案所造成的超額報酬與公司治理之間的影響，並進一步討論當公司治理愈差時，宣告購併所產生的超額報酬是否會較低。研究期間為民國87年1月至97年3月間，曾發生併購活動的上市、櫃公司，共選取100個樣本。而實證結果如下： 一. 經理人持股比例和公司宣告購併所造成的超額報酬呈顯著正相關 二. 大股東股比例和公司宣告購併所造成的超額報酬呈顯著正相關 三. 獨立董事占董事會的比例和公司宣告購併所造成的超額報酬呈顯著負相關 四. 董事會的規模和公司宣告購併所造成的超額報酬呈顯著負相關 五. 市值規模和公司宣告購併所造成的超額報酬呈現正相關，但不顯著 另外，本研究也針對公司治理較差的公司去進行研究分析，發現若公司治理較差的公司去從事購併案時，可賺取的超額報酬愈少，而當公司治理愈差時，這種關係將愈顯著。最後，本研究也彙整一些相關建議，以供後續學者、企業以及政府機關做參考。 / As scandals related to managers and the wealth of investors spring up worldwide, corporate governance has become an important issue recently. In addition to drastic international macroeconomics changes, corporate governance is also strongly influenced by overall monitor systems. Scholars around the world have done lots of research regarding corporate governance for decades. In addition, relevant efforts and measures, aimed at protecting investors’ rights and interests, have also been done by authorities such as FSC and TSE. The purpose of the study is to study the relationship between abnormal return of M&A and corporate governance by examining the factors we choose. Furthermore, we discuss if a company performs poorly on its corporate governance system, whether the abnormal return caused by merger deals will also decrease? 100 samples were selected from the listed companies from TSE and OTC between 1998~2008. Main findings include the following： (1). The ratio of the stock held by managers has a positive relationship with abnormal return of M&A. (2). The ratio of the stock held by major stockholders has a positive relationship with abnormal return of M&A. (3). The ratio of the outside independent directors has a negative relationship with abnormal return of M&A. (4). The scale of the board has a negative relationship with abnormal return of M&A. (5). The market value has a positive relationship with abnormal return of M&A Moreover, the study has also done some empirical research on companies whose corporate governance pale in comparison with others and found that those who do poorly on corporate governance tend to make less abnormal return when making acquisition announcements. Last but not least, the study has also made some suggestions for scholars, businesses and government and hope that they may come in handy in the future.