臺灣博碩士論文加值系統

在過去的研究中，不論是針對多角化折價或溢價，均著重於股權的價值。而後有學者提出了過去的研究均忽略了債權價值的改變。多角化折價只是由於多角化使風險下降（共保效果），使財富由股東移轉到債權人身上。在本篇研究中，我們將從事無相關購併的主併公司視為從事多角化的公司。嘗試找出當從事多角化動作時，具有不同特性的公司是否將有不同的行為，並試著驗證財富移轉與共保效果是否適用於各種性質的樣本。理論上，當公司本身信用品質較差時，多角化所達到的共保效果與風險效果將使債權價值上升，而使股權價值下降。而對信用品質佳的公司而言，共保效果與風險效果的作用方向則相反。我們的實證結果顯示，財富移轉效果確實存在於各信用品質不同的公司。但根據主併公司風險程度的不同，財富移轉的方向也就不同。當主併公司為非投資等級公司時，多角化將使其違約機率下降，財富由股東移轉給債權人；當主併公司為投資等級公司時，多角化將使其違約機率上升，財富由債權人移轉到股東身上。

Existing literature on diversification discount or premium focuses on the wealth of stockholders. Mansi and Reeb (2002) state that diversification discount just results from wealth transfer and that risk reduction causes wealth transfers from stockholders to debt holders. In this study, we view acquirer firms which involve in conglomerate mergers as diversifying firms and try to investigate whether firms with different characteristics have different behaviors. In theory, diversification reduces risky firms’ default probability through coinsurance effect and risk effect. But when firms are relatively safe, coinsurance and risk effect will generate impacts on a firm in different direction. Our empirical results show that wealth transfer effect exists but in different directions in firms with different credit quality. Default probability of risky firms declines when they conduct diversification, which is consistent with coinsurance effect with wealth transferred from stockholders to debt holders. On the contrary, default probability of investment grade firms increases when they diversify, which is inconsistent with coinsurance effect. In this case, the risk effect is greater than coinsurance effect and wealth transferred from debt holders to stockholders. We conclude that wealth transfer effect exists in firms with different credit quality, but the directions are opposite.

I. Introduction………………………………………………………………………..1
II. Methodology………………………………………………………………………6
A. Sample Selection……………………………………………………………6
B. Variable Management……………………………………………………...7
B.1 The two dimensions for dividing sample into four sub samples……7
B.2 Changes of default probabilities when firms diversify……………..8
B.3 Changes of excess firm value when firms diversify………..............9
III. Empirical results………………………………………………………………11
A. Changes in default probabilities…………………………………………11
B. Changes of excess firm values (book measure)…………………………15
C. Changes of excess firm value (market measure)……………………….17
IV. Conclusions……………………………………………………………………19
References…………………………………………………………………………20

Berger, Philip, and Eli Ofek, 1995, “Diversification’s effect on firm value” Journal of Financial Economics 37, 39-65
Burch, Timothy R. and Vikram Nanda, 2003, “Divisional diversity and the conglomerate discount: evidence from spinoffs” Journal of Financial Economics 70, 69-98
Billett, Matthew T. Tao-Hsien Dolly King, and David C. Mauer, 2004, “Bondholder wealth effects in mergers and acquisitions: new evidence from the 1980s and 1990s” Journal of Finance 59, 107-135
Black, Fischer, and Myron Scholes, 1973, “The pricing of options and corporate liabilities” Journal of Political Economy 81, 637-659
Doukas, John A. and Ozgur B. Kan, 2004, “Excess cash flows and diversification discount” Financial Management Summer 2004, 5-22
Galai, Dan, and Ronald W. Masulis, 1976, “The option pricing model and the risk factor of stock” Journal of Financial Economics 3, 53-81
Lewellen, Wilbur G., 1971, “A pure financial rationale for the conglomerate merger” Journal of Finance 26, 521-537
Maksimovic, Vojislav and Gordon Philips, 2002, “Do conglomerate firms allocate resources inefficiently across industries? Theory and evidence” Journal of Finance 57, 721-767
Mansi, Sattat A. and David M. Reeb, 2002, “Corporate diversification: What gets discounts?” Journal of Finance 57, 2167-2183
Martin, John D. and Akin Sayrak 2003, “Corporate diversification and shareholder value: a survey of recent literature” Journal of Corporate Finance 9, 37-57
Merton, Robert C, 1974, “On the pricing of corporate debt: The risk structure of interest rates” Journal of Finance 29, 449-470
Rajan, Raghuram, Henry Servaes, and Luigi Zingales, 2000, “The cost of diversify: The diversification discount and inefficient investment.” Journal of Finance 55, 35-80
Stein, Jeremy, 1997, “Internal capital markets and the competition for corporate resources” Journal of Finance 52, 111-133
Titman, Sheridan, Stathis Tompaidis, and Sergey Tsyplakov 2004, “Market imperfections, investment flexibility, and default spreads” Journal of Finance 59, 165-205
Vassalou, Maria and Yuhang Xing 2004, “Default risk in equity returns” Journal of Finance 59, 831-868
Whited, Toni, 2001, “Is it inefficient investment that causes the diversification discount?” Journal of Finance 56, 1667-1691.