本研究以適用於民國九十九年九月一日修正前之「公開發行公司辦理私募有價證券應注意事項」辦理私募增資之上市櫃公司為研究對象，研究期間為民國九十四年十月十一日至九十九年八月三十一日，以探討內部人行為對私募折價幅度之影響。 　　研究結果發現，公司內部人若有參與私募者，則折價幅度會較純粹為外部人應募之私募案為大，顯示內部人可能藉由其職權，壓低私募價格以自肥，符合利益掠奪假說。此外，若內部人於應募前後，尚還有出售老股套利或隱瞞應募人與公司關係之情事者，其折價幅度越大。顯示內部人若意圖假私募手法圖利自身時，其確會運用其對公司之影響力，蓄意壓低私募價格以賺取折價之價差，或刻意隱瞞資訊以規避小股東之監督。因此，私募折價幅度與內部人是否參與應募以及續後之作為，確有密切關聯。 / This study examines the effect of insiders’ activities on the price discount of private placement. The sample period starts from October 11th, 2005 and ends August 31th, 2010, one day before the last revision on the regulation, Directions for Public Companies Conducting Private Placements of Securities. The empirical result shows that the price discount under private placement with insiders involved is more than that with outsiders only. The insiders, in accordance with entrenchment hypothesis, may benefit by discounting the price in the private placement. In addition, more price discount may also be taken by the insiders who intend to benefit from selling stocks while purchasing stocks from the private placement or intentionally concealing information about their relationship with the company. It’s evident that the price discount under private placement has something to do with whether the insiders are involved and how they behave in response.

改革開放之後，中國國有企業中腐敗貪污行為滋生蔓延。本論文研究之目的在於分析中國「內部人控制問題」之腐敗問題為何出現，並且如何阻止由此造成的損害。本論文從「契約理論」、「委託代理理論」、「產權理論」的角度來考慮產生「內部人控制問題」的起因，並且憑藉前述的理論分析中國經濟體制改革中出現「內部人控制問題」的過程。 改革開放之前，中國採取「社會主義計劃經濟」。在中央集權的高度集中計劃分配下，企業不可有企業的經營觀念，企業的生產經營缺乏效率與企業職工缺乏積極性，因此試圖透過建立勞動機制，誘發出對經營的積極性。中國經濟體制改革之特徵為分權式改革，就是放權讓利方式激發企業職工。同時透過稅制改革、企業內外部結構的改革約束企業職工行為。在這些國有企業改革過程中，中國觸動了使用權（或控制權）、收益權（或索取權）等產權，但沒有沒有徹底實行全面的產權改革。企業經營層透過國有企業改革跨大了其控制企業的權力，但並沒有構建出充分的約束機制，因此造成嚴重「內部人控制問題」。 利改稅、企業裡設定公司制度等措施是一種約束企業經營者，即阻止企業經營層利用權力，踏進腐敗之路，但中國貪污情形不停的成長。本論文研究，以現在的中國情況看，國有企業採取什麼措施才能夠控制「內部人控制問題」。

La Porta 等人以提高內部人持股可使內、外部股東利益一致，進而降低代理問題的觀點出發，在2002 年發表的實證研究中指出，提高內部人持股有助於提升公司的價值，特別是在對外部投資人保護較差的國家；他們也發現，對投資人保護程度愈好的國家，該國企業的價值也較高。本研究則從提高內部人持股可能產生的代理問題著手，在利弊同時存在之下，以涵蓋範圍更廣、時間更長的樣本，探討在不同的投資人保護環境下，提高內部人持股對公司價值的影響，以及投資人保護程度對於內部人持股集中與分散的公司價值是否也有不同的影響。 本研究發現，在投資人保護較佳的國家，提高內部人持股會傷害公司價值，但在投資人保護較差的國家，提高內部人持股可增加公司價值。另外，公司價值與內部人持股率之間呈現曲線關係，當內部人持股率相對較低時，提高內部人持股對公司價值是弊多於利；當內部人持股水準相對較高時，提高內部人持股則是利多於弊。而投資人保護程度對於內部人持股較分散的公司而言，顯得較為重要。因此，法律層面對投資人的保護程度和內部人持股集中度對於公司價值的影響有顯著的替代效果。 / This paper uses a sample of companies from 34 countries around the world to shed light on the relationships among legal protection of shareholders, ownership structure, and firm value. La Porta et al. (2002) indicate a positive relationship between cash flow, ownership, and firm value, especially in countries with poor investor protection. Besides, they also find evidence of higher valuation of firms in countries with better protection of minority shareholders. However, they don’t consider the effect of higher ownership on the cost of stealing, which may cause the controlling shareholders to expropriate more from minority shareholders. Also, their study covers only large firms with a controlling shareholder by one year data. Their results can be restricted to large firms and a particular year. Therefore, we use more comprehensive time series and cross section data to probe into the subject. Using various specifications of the valuation regressions of Fama and French (1998), we find that higher ownership improves valuation in poor protection countries while higher ownership deteriorates valuation in good protection countries. In addition, stronger legal protection improves firm value, especially the firms with low ownership concentration. That is, there is a substitute effect of legal protection and ownership concentration on firm valuation. Finally, we also testify that dividends are valued more in poor protection countries and firms with low ownership concentration.

本文以三篇論文討論三個與財務報表向下重編盈餘公司有關的議題：（1）宣告財務報表重編後的長期股票績效；（2）重編公司內部人交易行為；（3）重編公司如何操弄盈餘以及操弄動機為何？ 本文樣本是從1984年1月至2000年12月，557家因為財務報表違法、舞弊或錯誤而宣告需要重編以前財務報表的公司。 第一篇論文討論公司宣告重編後三年長期股票績效。在不同配對組合下，實證結果顯示，三年長期持有異常報酬（buy-and-hold abnormal return）達-34％。文中也討論公司宣告重編時以及後續分析師預測行為。結果發現，分析師對於重編資訊有反應不足的現象，而且三年的盈餘預測修正與長期異常報酬有顯著正相關。 第二篇論文探討盈餘品質與內部人交易行為。本文假設內部人擁有重編公司盈餘品質不良的私有資訊，內部人會利用此私有資訊從事異常交易。實證結果顯示，內部人早在重編前兩年就已經開始異常出售持股，但是為了避免被發現，愈接近重編期間則交易量愈少，而且內部人異常交易與重編金額成正相關。 第三篇論文採取應計項目分項的方法（disaggregate approach）探討重編項目與特定應計項目的關連性以及重編公司違反一般公認會計原則的動機。實證結果顯示，特定重編項目公司的總應計項目比特定應計項目更顯著。很可能是管理當局為了避免操弄特定項目以致於被發現，所以操弄各種應計項目以達到總金額的目標。尤其在不同盈餘管理動機的成本效益的考量下，如果操弄主要應計項目的效益大於成本，管理當局還是會操弄特定應計項目以達到操弄的目的。因此，應計項目分項的方法可以作為進一步探討盈餘管理的方法。 / This dissertation examines three different aspects of downward earnings restatements in three essays: (1) the long-run stock performance of restatement firms following the announcements of restatements; (2) insider trading activities of earnings restatement firms; and (3) how earnings manipulations of restatement firms are effected and what are the incentives for earnings manipulations? Using extensive keyword (i.e., “restatements,” “restate,” “restated,” “restates,” and “restating”) searches over the period from January 1, 1984 through December 31, 2000, 557 firms are identified as having restated their previously published or filed financial statements due to accounting irregularities, fraud, or errors. The first essay examines the post earnings restatement announcement of long-term stock performance. Using various benchmark portfolio formulation strategies, I document an average buy-and-hold abnormal return of -34% over the 36-month horizon. I then investigate analysts’ forecast behavior around and after the restatement announcements. I find that market underreactions are associated with a sluggish forecast revisions by financial analysts. This study sheds light on how restatement information is transmitted to the capital markets and provides evidence that the market under reacts to externally initiated corporate events. The second essay examines the relationship between earnings quality and insider trading. Using downward earnings restatement firms to identify low-quality earnings, I find that insiders outsell non-earnings restatement firms of their holdings over the period from two years before to one year before the beginning of the restatement period. In addition, the amounts of restatement are positively associated with the excess insider selling. I also provide evidence that excess insider selling predicts excessive earnings manipulations that eventually lead to GAAP violation. In the third essay, I take advantage of the disclosed manipulation of items and approach the earnings manipulation issue by a disaggregate approach. Given that management considers cost/benefits of specific accruals to be manipulated, I examine whether management chooses different items to manipulate under different goals. Overall, the empirical results support the equity offering hypothesis and weakly support the meeting earnings threshold hypothesis. However, the results fail to support the avoidance of debt covenant violation hypothesis, indicating that manipulation under certain monitoring conditions can be conducted in a very subtle manner.