【正文】
程中的變量及殘差都是平穩(wěn)的??偠灾?,公司治理較為完善公司對(duì)于投資者的股票收益有顯著的積極影響,長(zhǎng)期持有公司治理狀況好的公司的股票組合會(huì)給投資者帶來(lái)更高的額外收益,同時(shí)還能使投資者避免其他非系統(tǒng)性風(fēng)險(xiǎn)而只受到系統(tǒng)風(fēng)險(xiǎn)的影響。上述結(jié)果表明從投資者角度來(lái)看,公司治理是有效的。五、 結(jié)論以及進(jìn)一步的研究本文在分析相關(guān)文獻(xiàn)的基礎(chǔ)上,利用南開(kāi)大學(xué)公司治理研究中心對(duì)我國(guó)上市公司20032005年公司治理狀況連續(xù)的評(píng)價(jià)指數(shù),結(jié)合CCER數(shù)據(jù)庫(kù)的相關(guān)指標(biāo)對(duì)公司治理狀況與其價(jià)值和股票收益之間的關(guān)系進(jìn)行了實(shí)證分析,結(jié)果表明,公司治理狀況的改善總體上顯著提高了公司價(jià)值,這一結(jié)論在不同區(qū)域以及兩類(lèi)特殊樣本公司即Q值和ROA逐年上升的樣本中同樣成立;對(duì)各個(gè)分指數(shù)的分析表明各個(gè)治理機(jī)制的完善對(duì)公司ROA都有顯著的推動(dòng)作用,而除了控股股東以及監(jiān)事會(huì)以外的治理機(jī)制都會(huì)對(duì)公司價(jià)值有顯著的正向影響;對(duì)Q和ROA逐年增加樣本的回歸結(jié)果也表明公司價(jià)值增加的提高一部分確實(shí)是由公司治理的完善所引致的;在考慮到公司治理指數(shù)的內(nèi)生性影響以后,模型的回歸結(jié)果也基本保持不變。對(duì)于公司治理與股票收益之間的關(guān)系,四因素模型的回歸結(jié)果表明公司治理的完善對(duì)投資者的股票收益有積極影響,長(zhǎng)期持有公司治理狀況好公司的股票組合會(huì)給投資者帶來(lái)更高的額外收益,且當(dāng)公司治理水平達(dá)到一定程度時(shí),投資者的股票收益只會(huì)受到市場(chǎng)風(fēng)險(xiǎn)的影響。本文的結(jié)論基本支持了公司治理的改善會(huì)帶來(lái)公司價(jià)值增加并且對(duì)股票收益有正向影響的觀點(diǎn),從公司以及投資者角度證實(shí)了公司治理的有效性,但是有待進(jìn)一步研究的是,公司治理是直接影響公司價(jià)值及其股票收益嗎?如果不是,那么公司治理是通過(guò)什么樣的機(jī)制來(lái)最終影響公司價(jià)值及股票收益的呢?上述問(wèn)題有待于進(jìn)一步研究。 參考文獻(xiàn):白重恩、劉俏、陸洲、宋敏、張俊喜,2005:《中國(guó)上市公司治理結(jié)構(gòu)的實(shí)證研究》,《經(jīng)濟(jì)研究》第2期。曹廷求、楊秀麗、孫宇光,2007:《股權(quán)結(jié)構(gòu)與公司績(jī)效:度量方法與內(nèi)生性》,《經(jīng)濟(jì)研究》第10期。李維安,2005:《中國(guó)公司治理評(píng)價(jià)研究》,中國(guó)財(cái)政經(jīng)濟(jì)出版社。李維安、牛建波,2007:《中國(guó)上市公司的治理溢價(jià)研究―基于中國(guó)公司治理指數(shù)(CCGINK)的經(jīng)驗(yàn)分析》,南開(kāi)大學(xué)公司治理研究中心工作論文。李維安、唐躍軍,2006:《公司治理評(píng)價(jià)、治理指數(shù)與公司業(yè)績(jī)——來(lái)自2003 年中國(guó)上市公司的證據(jù)》,《中國(guó)工業(yè)經(jīng)濟(jì)》第4期。李維安、張國(guó)萍,2005:.經(jīng)理層治理評(píng)價(jià)指數(shù)與相關(guān)績(jī)效的實(shí)證研究基于中國(guó)上市公司治理評(píng)價(jià)的研究,《經(jīng)濟(jì)研究》第11期。李維安等,2003:《中國(guó)上市公司治理評(píng)價(jià)系統(tǒng)研究》,《南開(kāi)管理評(píng)論》第3期。南開(kāi)大學(xué)公司治理研究中心公司治理評(píng)價(jià)課題組,2003:《中國(guó)上市公司治理評(píng)價(jià)系統(tǒng)研究》,《南開(kāi)管理評(píng)論》第3期。南開(kāi)大學(xué)公司治理研究中心公司治理評(píng)價(jià)課題組,2004:《中國(guó)上市公司治理指數(shù)與治理績(jī)效的實(shí)證分析》,《管理世界》第2期。南開(kāi)大學(xué)公司治理研究中心公司治理評(píng)價(jià)課題組,2006:《中國(guó)上市公司治理指數(shù)與公司績(jī)效的實(shí)證分析—基于中國(guó)1149 家上市公司的研究》,《管理世界》第3期。潘福祥,2004:《公司治理與企業(yè)價(jià)值的實(shí)證研究》,《中國(guó)工業(yè)經(jīng)濟(jì)》第10期。宋敏、張俊喜、李春濤,2004:《股權(quán)結(jié)構(gòu)的陷阱》,《南開(kāi)管理評(píng)論》第1期。王躍堂、趙子夜、魏曉雁,2006:《董事會(huì)的獨(dú)立性是否影響公司績(jī)效?》,《經(jīng)濟(jì)研究》第5期。Bebchuk, Cohen and Ferrell, 2005, What matters in corporate governance?, SSRN Working Papers.Beiner, Drobetz, Schmid and Zimmermann, 2006, An Integrated Framework of Corporate Governance and Firm Valuation, European Financial Management, Vol. 12, pp. 249–283.Beiner, et al., 2003, Is board size an independent corporate governance mechanism? ,Working Papers, University of Basel.Black, Jang and Kim, , 2006, Does Corporate Governance Predict Firms’ Market Values? 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