In view of the acceptance of short selling of stocks as an investment tool in the portfolio context by a growing number of institutional investors in recent years, the present study considers both normative and market-equilibrium aspects of portfolio selection with short selling. Under the full-information covariance structure of security returns, the study accurately captures institutional procedures for short selling without sacrificing analytical tractability. While short selling enhances the portfolio's risk-return trade-off from a normative perspective, the equilibrium analysis reveals that there is a continuum of market-clearing prices within two boundaries for each security. Economic implications of the equilibrium pricing relationship are also explored in the study.

Recent occurrences of financial distress to some insurers have raised questions about whether the current guaranty system is adequate to protect policyholders. Four new systems have been proposed. Using the state preference model, it was found the Stewart's national system faring the best, if it adopts uniform regulation. Based on agency theory, the pre-assessment approach and the policyholder surcharge (or premium increase) recoupment method were found to be better than the current post-assessment approach and premium tax offset method. Furthermore, uniform policy limits and regulations are recommended.

The market for credit cards has been the subject of recent attention and controversy because of ‘high’ profits earned on credit cards and substantial premiums on the resale of credit-card receivables. This paper estimates risk—return profiles for credit-card banks and explores the role of intangible assets in determining resale premiums on credit-card receivables. In addition, the effects on the resale market of securitization and the opportunity cost of acquiring new accounts are analyzed. Using alternative measures of risk and alternative control groups, we find, for the years 1989 to 1995, that credit-card banks earned significantly higher returns on assets but that these returns were associated with greater risk-taking. Analysis of premia for the years 1993 to 1995 suggest that acquiring banks pay higher premia for mid-sized regional accounts than for larger, national portfolios, perhaps because of richer cross-selling opportunities.

Over the last decade, there has been considerable public debate in the U.S. on the need to maintain legal barriers (firewalls) between commercial and non-traditional banking. However, no theoretical model has yet been developed that examines the joint influence of various factors suggested, such as competition, production economies and regulatory subsidies that affect the bank's incentive to undertake non-traditional activities. This paper applies a stochastic control model to examine the joint effects of these factors on a bank's optimal investment decisions in non-traditional banking and develops some empirically testable hypotheses.

Some of the most recent empirical studies on interest rate derivatives have found humped shapes in the volatility structure of interest rates. In this paper, we propose a simple model that allows for humped volatility structures, and that can be described by one state variable. With the model, American style claims can be priced very efficiently which is very important if the model has to be calibrated daily to market prices of standard American options. Furthermore, the model allows for explicit formulas for European style options. Finally, the computational efficiency of our model in the Li et al. (1995) framework is compared with the efficiency in a typical Hull and White (1993a, 1994, 1996) framework. In fact, we can use both procedures for our model, since we prove that if a deterministic volatility model can be embedded in either of these algorithms, then so it does in the other one. Empirical evidence from option data supporting our model is provided as well.

We use data uniquely available from the Commodity Futures Trading Commission (CFTC) to document the intraweek trading patterns of large speculators in five futures markets. These markets include futures traded against the Standard and Poor's 500 stock index, Treasury Bonds, gold, corn, and soybeans. We also examine the influence of large speculator trades on the patterns of volume and volatility for the contracts in our sample. Though we detect the familiar U-shaped and inverted U-shaped patterns across weekdays for volatility and aggregate volume, the association between volume and volatility becomes stronger when we separate large speculator volume from volume associated with other traders. The coefficient on large speculator volume is much larger than the coefficient on other volume in these regressions. Compared with total volume, large speculator volume is greater on Mondays than on the other days of the week in all five markets.

We assess the effects of the introduction and passage of state nonshareholder constituency statutes on shareholder wealth. We find a small, but significantly negative effect on shareholder wealth for companies incorporated in states passing nonshareholder constituency statutes that did not already have corporate takeover defenses in place. Further, we find that firms that are poorly managed (as proxied by low market-to-book ratios) react more negatively to the statutes.

We value American options on bonds using a generalization of the Geske–Johnson (Geske, R., Johnson, H., 1984. Journal of Finance 39, 1151–1542) (GJ) technique. The method requires the valuation of European options, and options with multiple exercise dates. It is shown that a risk-neutral valuation relationship (RNVR) along the lines of Black–Scholes (Black, F., Scholes, M., 1973. Journal of Political Economy 81, 637–659) model holds for options exercisable on multiple dates, even under stochastic interest rates, when the price of the underlying asset is lognormally distributed. The proposed computational procedure uses the maximized value of these options, where the maximization is over all possible exercise dates. The value of the American option is then computed by Richardson extrapolation. The volatility of the underlying default-free bond is modeled using a two-factor model, with a short-term and a long-term interest rate factor. We report the results of simulations of American option values using our method and show how they vary with the key parameter inputs, such as the maturity of the bond, its volatility, and the option strike price.