Singular mixture copulas

We present a new family of copulas??the Singular Mixture Copulas. We begin with constructing singular copulas whose supports lie on the graphs of two given quantile functions. These copulas are then mixed with respect to a continuous distribution resulting in a nonsingular parametric copula. The Singular Mixture Copulas we construct have a Lebesgue density and a closed form representation. Moreover, they have positive lower and upper tail dependence. As an application we fit the copulas to flood level data. As the results show Singular Mixture Copulas provide an alternative to elliptical copulas, e.g., Gaussian and t-copulas, in modeling strongly dependent random variables.     

Performance differentiation: cutting losses and maximizing profits of private equity and venture capital investments

Recent research has pointed out the need to differentiate between good versus poor performance of venture capital and private equity investments and to analyze the factors that determine the ‘winners’ and ‘losers’ of a fund. This study examines the different contractual and behavioral characteristics and their influence on the positive and negative performances of private equity investments. Specifically, we analyze how fund managers apply tools and investment behavior to mitigate risks and maximize returns. The empirical investigation of these questions is based on a merged dataset, which combines the Venture Economics and CEPRES databases. It includes a total of 1,011 investments made by 137 different funds that belong to 54 private equity and venture capital firms worldwide over the period from 1979 to 2003. Our results confirm that the reduction of losses and the maximization of investment profits have different antecedents. Although losses are minimized by the use of convertibles and by increasing the venture capital firms’ accumulated experience, profits are increased by the potential of the fund’s management to allocate resources to portfolio companies. Our findings contribute to the understanding of the determinants of venture capital and private equity returns by differentiating between the mitigation of risks and the maximization of profits.      

Takeover threats,antitakeover amendments and stock price reaction

We examine the influence of takeover threats on the stock price of firms proposing antitakeover amendments. Stock prices of the majority of firms, which are not takeover targets during the four years surrounding the amendments, are unaffected, while prices of firms that become takeover targets within two years increase significantly. We document weak evidence of wealth losses only for a sample of prior targets. Our findings suggest that shareholders of the average firm are not harmed by antitakeover amendments because they provide either a better bargaining position or an information signal to the market.     

Market Response to Liquidity Improvements: Evidence from Exchange Listings

The study examines a sample of 895 stocks that moved from Nasdaq to the New York Stock Exchange or to the American Stock Exchange (Amex) between 1971 and 1994. We show how various measures of liquidity such as the bid‐ask spread, trading volume, and stock price precision improve in somewhat different ways upon transfer to NYSE (Amex). We also find that reductions in trading costs (percentage spread) and in pricing error volatility (Hasbrouck's σ₅) can explain most of stock market's positive response to exchange listing. Thus, liquidity has many facets and cannot be represented by the bid‐ask spread alone.     

Switching to Continuous Trading and its Impact on Return Behavior and Volume of Trade

The study investigates changes that occurred following the transfer of 29 stocks in Israel from a single daily auction to a more continuous-like trading system. On average, the standard deviation of daily market model residuals decreased, and trading volumes increased. This suggests that continuous trading promotes end-of-day price efficiency and better suits investors' trading-mechanism preferences. An interesting phenomenon observed is that the noisiness of end-of-day prices decreases immediately after the transfer, while volume rises only later on. This constitutes evidence that adding rounds of trade contributes to price accuracy even when trading volumes do not increase.