This paper analyzes the effects of the cross equity investment, the business structure, and the regulation on cross equity investment within a corporate conglomerate. In equilibrium, the cross equity investment increases as the controlling shareholder can extract f perquisite more easily. The business structure of a conglomerate becomes more closely related as the potential synergy is larger. The conglomerate expands cross equity investment if the potential synergy is small, and emphasizes risk management otherwise. Perquisite not only directly hampers distributive fairness, but also indirectly improves allocative efficiency by mitigating agency problem of outside equity. Thus, the influence of the regulation on cross equity investment depends on the parameters of the model. Such regulation improves fairness without hampering efficiency if the potential synergy is sufficiently large.

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This study explores the relationship between the arrival of public information and the intraday volatility in the Korean stock market using the GARCH model under the assumption of the existence of conditional heteroskedasticity in the intraday stock return. The number of E-daily news headlines in a certain time interval for the period of 2001~2003 has been used as the proxy for public information, whereas the KOSPI return and the trading volume for the same period have been used for the market activity variables. The addition of news variable in the conditional variance equation in the GARCH model results the increasing effect on the market volatility. But, as the time interval has been increased, the relative impact of public information has decreased the market volatility. It indicates that the market volatility has been affected mainly by the arrival of public news in short term, but the investors have reacted on those news as well as some private information very shortly. Finally, the domestic and international news has separately been tested in that how those news affect the magnitude of the persistence of volatility. It turns out that domestic news has decreased the level of persistence more than the international news, and the relative impact of international news is larger than that of domestic news.

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This paper reports the empirical evidence on the relation between family ownership and firm performance using the 1,616 non-financial firms at the Korean Stock Market. We find that the family ownership is a significant determinant of the firm performance. The family firms significantly outperform the non-family firms, and the performances in the young-family firms and the old-family firms are indifferent. We classify the family ownership into direct and indirect one which the indirect-family firm is governed by the affiliated companies. The indirect-family firms as well as the direct-family ones perform better than non-family firms. Our results provide the family firms are prevalent and effective business structure in Korea, and support the convergence of interest hypothesis.

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This paper discussed how abrupt changes of the stock price index could be linked to uncertainties in the political events in Korea. Using the presidential regimes as proxies for political uncertainty, I first tested for the question of whether return generating processes of the respective presidential regimes were different from those of other regimes. Then, using the logic of sequential testing procedures, I investigated the existence of the possible break points in the stock index returns. The following results were obtained. First, the financial crisis in 1997 is confirmed to have greatly influenced the return and volatility generating processes of the Korean stock market. Second, when the model incorporated unexpected changes of macroeconomic variables, I found that the structural break points had existed several months earlier than the official announcement of the beginning of the IMF-controlled period. Third, I also found that the break points occurred around a point of presidential regime changes, which was taken as partial evidence for the impact of the political factors on the behavior of the stock market.

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