The effect of estimation risk on optimal portfolio choice

This paper determines the effect of estimation risk on optimal portfolio choice under uncertainty. In most realistic problems, the parameters of return distributions are unknown and are estimated using available economic data. Traditional analysis neglects estimation risk by treating the estimated parameters as if they were the true parameters to determine the optimal choice under uncertainty. We show that for normally distributed returns and ‘non-informative’ or ‘invariant’ priors, the admissible set of portfolios taking the estimation uncertainty into account is identical to that given by traditional analysis. However, as a result of estimation risk, the optimal portfolio choice differs from that obtained by traditional analysis. For other plausible priors, the admissible set, and consequently the optimal choice, is shown to differ from that in traditional analysis.     

'Nonprofits' need surplus too

By definition profit refers to the difference between revenue and expenses. In for-profit organizations profit or surplus gives a return to the owners of the company and serves as a source of financing for capital acquisitions and working capital. Nonprofit organizations, which are not allowed a surplus, don't suffer on the first count because they have no owners. But they do suffer on the second count because, if expected to grow, they need to finance asset replacement and growth. In these days when funds for long-term debt are becoming scarcer, this author asserts, the need for regulators to allow 'nonprofits' to keep a surplus is increasing. In this article, he argues for a surplus and then discusses how managers and regulators can determine how much a nonprofit organization should be allowed. He presents a combination of a modified version of the return-on-asset pricing model used in for-profit organizations and a model for assessing working capital needs associated with growth.     

Measures used to evaluate industrial marketing activities

Given the importance of controlling marketing efforts, a study was conducted of industrial manufacturers to determine the extent of their use of various measures to evaluate different marketing activities. The predominate measures used for evaluation were sales volume with much less utilization of profitability, productivity, and expense measures.     

The Variance Gamma Process and Option Pricing

A three parameter stochastic process, termed the variance gamma process, that generalizes Brownian motion is developed as a model for the dynamics of log stock prices. The process is obtained by evaluating Brownian motion with drift at a random time given by a gamma process. The two additional parameters are the drift of the Brownian motion and the volatility of the time change. These additional parameters provide control over the skewness and kurtosis of the return distribution. Closed forms are obtained for the return density and the prices of European options. The statistical and risk neutral densities are estimated for data on the S & P500 Index and the prices of options on this Index. It is observed that the statistical density is symmetric with some kurtosis, while the risk neutral density is negatively skewed with a larger kurtosis. The additional parameters also correct for pricing biases of the Black Scholes model that is a parametric special case of the option pricing model developed here.     

Emotion As Well As Reason: Getting Students Beyond "Interpersonal Accountability"

The paper notes the recent spread of business ethics courses in American higher education, observing that teachers trained in economics have not readily incorporated ethical notions or theory into regular courses, such as finance, management, accounting, and marketing. The presumed ethically neutral, value-free approach of economists, who dominate business courses, is increasingly inadequate to meet the needs of business managers – or of business students. Technological and political changes, creating an interdependent environment within which managers operate, have eroded older ethics based on tradition and common backgrounds. They have also raised ethical issues of new orders of complexity. With corporate business managers finding ethical concerns more pressing matters than do many teachers, the paper offers some tentative answers to three questions about how to interest business students in ethical issues: What Approach to Business Ethics Gets student's Attention? What Is the Value of Simulations and Games? What Can Be Said About the Business System And Its Values? The answer to the first question is simulations and games. Case method analysis is serviceable, engaging students' intellect, but all too often without emotional involvement or self-revelation. Experiential learning through class-room games accomplish both engagement and involvement in ways that are exceedingly helpful to business students, who have had "less occasion for critical reflection on self and world than have others of their age." The answer to the second question is: They engage the whole student, stimulating the player to examine the source of her ethical strengths and the reasons for ethical lapses. Generating emotional involvement the games leverage and enhance reasoning, allowing students to learn more about their own values and question their own behavior. The answer to the third question is: A socially justifiable (community-legitimated) competitive market system requires of its managerial participants an emotionally informed response – as well as a rational analysis and use of business techniques. Business operates with enhanced effectiveness efficiency at appropriate levels of such virtues as loyalty, trustworthiness and cooperativeness; they ensure externality benefits as well as promote justice for its own ultimate social justification.     

The dawn of the e-lance economy

Will the large industrial corporation dominate the twenty-first century as it did the twentieth? Maybe not. Drawing on their research at MIT's Initiative on Inventing the Organizations of the 21st Century, Thomas Malone and Robert Laubacher postulate a world in which business is not controlled through a stable chain of management in a large, permanent company. Rather, it is carried out autonomously by independent contractors connected through personal computers and electronic networks. These electronically connected free-lancers-e-lancers-would join together into fluid and temporary networks to produce and sell goods and services. When the job is done--after a day, a month, a year--the network would dissolve and its members would again become independent agents. Far from being a wild hypothesis, the e-lance economy is, in many ways, already upon us. We see it in the rise of outsourcing and telecommuting, in the increasing importance within corporations of ad-hoc project teams, and in the evolution of the Internet. Most of the necessary building blocks of this type of business organization--efficient networks, data interchange standards, groupware, electronic currency, venture capital micromarkets--are either in place or under development. What is lagging behind is our imagination. But, the authors contend, it is important to consider sooner rather than later the profound implications of how such an e-lance economy might work. They examine the opportunities, and the problems, that may arise and anticipate how the role of managers may change fundamentally--or possibly even disappear altogether.