Parameter uncertainty in portfolio selection: Shrinking the inverse covariance matrix

The estimation of the inverse covariance matrix plays a crucial role in optimal portfolio choice. We propose a new estimation framework that focuses on enhancing portfolio performance. The framework applies the statistical methodology of shrinkage directly to the inverse covariance matrix using two non-parametric methods. The first minimises the out-of-sample portfolio variance while the second aims to increase out-of-sample risk-adjusted returns. We apply the resulting estimators to compute the minimum variance portfolio weights and obtain a set of new portfolio strategies. These strategies have an intuitive form which allows us to extend our framework to account for short-sale constraints, transaction costs and singular covariance matrices. A comparative empirical analysis against several strategies from the literature shows that the new strategies often offer higher risk-adjusted returns and lower levels of risk.     

Thinking one step ahead: The use of conjectures in competitor analysis

An assessment of opponents' reactions to strategic and functional area policy decisions is shown to require knowledge concerning opponents' beliefs about the firm's behavior. This study introduces a methodology for incorporating such conjectures into the business planning process. It presents an analytical measure for these conjectural variations and discusses several illustrations. Examples of the application of the framework are provided by the Japanese flat glass industry and the U.S. domestic coffee roasting industry. The use of a broad range of conjectural variations in competitor analysis is discussed, and implications for business strategy formulation are highlighted.     

Who needs a reason to indulge? Happiness following reason-based indulgent consumption

While consumers and marketers perpetuate the lay theory that indulging with a reason is more pleasurable and makes everyone happier, this research identifies a condition under which indulging without a reason “feels right” and produces a more positive emotional reaction. The authors show that indulging with or without a reason and consumers' trait self-control interact to influence happiness felt following an indulgent purchase. While high self-control consumers are happier when they have a reason to buy indulgent products (e.g., when they can justify the indulgence), low self-control consumers are happier when they do not have a reason to indulge. That is, indulging with a reason is less pleasurable for consumers with low self-control. This effect on happiness has an impact on downstream judgments about the product and yields important implications for consumer welfare as well as marketing managers. Across four studies we show the effect on consumption happiness, examine consequences of the effect, and report evidence for the underlying process.     

Regional heterogeneity,the rise of public debt and monetary policy in post-bubble Japan: lessons for the EMU

Both Japan and parts of the European Monetary Union have experienced boom and bust in stock and real estate markets, which have been followed by a lasting crisis. The paper analyses the role of a high degree of regional heterogeneity for public debt and monetary policy in the context of crisis. It is shown for Japan that the attempts to maintain regional cohesion via a regional transfer mechanism has contributed to the unprecedented rise in public debt and persistent monetary expansion. Econometric estimations show that in Japan regional redistribution of funds has ensured homogeneous living conditions across Japanese regions pre- and post-crisis. The side condition is monetary expansion. A similar effect could emerge in Europe, if the crisis persists.     

Lacking pluralism? A critical review of the use of cultural dimensions in negotiation research

Management Review Quarterly - Cross-Cultural-Negotiations are pivotal in global business. Research frequently approaches this topic using cultural dimensions as underpinning conceptual constructs....     

Accumulation and the transfer of technology: Issues of conflict and mechanisms for the exercise of control

The transfer of technology from developed to underdeveloped economies is almost always associated with a conflict of interests between the supplier and the recipient of technology. Where this conflict arises control is exerted by the more powerful party to ensure that the conflict is settled in its favour. It is argued in this paper that control is allied to the power to determine the rate and type of accumulation of capital. A number of potential areas of conflict are discussed, and this is followed by a discussion of the mechanisms which the various parties can use to settle conflict in their favour.     

Structural Applications of the Discrete Choice Model

A growing body of empirical literature uses structurally-derived economic models to study the nature of competition and to measure explicitly the economic impact of strategic policies. While several approaches have been proposed, the discrete choice demand system has experienced wide usage. The heterogeneous, or mixed, logit in particular has been widely applied due to its parsimonious structure and its ability to capture flexibly substitution patterns for a large number of differentiated products.We outline the derivation of the heterogeneous logit demand system. We then present a number of applications of such models to various data sources. Finally, we conclude with a discussion of directions for future research in this area.     

The Assessment of Information Technology Maturity in Emergency Response Organizations

In emergency response organizations, information technologies are not adequately explored. Sometimes, the mere adoption of new information technologies is not productive, as their efficient use depends on other interrelated technologies and the environment where they are installed. This work describes a model to help organizations understand their capability in respect to the adoption of these technologies. The model also helps the performing of the evaluation from different perspectives, making it suitable to collaborative evaluation. Using the proposed model, an organization can measure its maturity level in different aspects of the evaluation and guide the investment on its capabilities. Part of the model has been developed for emergency response organizations and the information technology dimension of the model has been applied to two fire department installations.     

Competition and price discrimination in the market for mailing lists

This paper examines whether mailing list sellers, when faced with additional competitors, are more likely to try to segment consumers by offering additional choices at different prices (second-degree price discrimination) and/or offering different prices to readily identifiable groups of consumers (third-degree price discrimination). We utilize a dataset that includes information about all consumer response lists derived from mail order buyers (i.e. lists derived from catalogs) available for rental in 1997 and 2002. Our results indicate that increased competition leads to an increased propensity to price discriminate along each of the dimensions we investigate. These results hold for both second-degree and third-degree price discrimination. Further, list owners offer menus with more choices in more competitive markets. These results, taken together with results from other empirical studies, suggest that the connection between competition and increased price discrimination is a result that applies broadly.

Outlet patronage in on-the-go consumption: An analysis of patronage preference drivers for convenience outlets versus traditional retail outlets

This study investigates patronage preferences of consumers who purchase and consume food and beverages while they are on-the-go (on-the-go consumption). The focus is on the drivers of patronage preferences for convenience outlets versus traditional retail outlets. A literature based model of patronage preferences is developed in this paper. It is tested based on data collected from a Dutch online sample (n=669) through binary logistic regression. The results reveal that significant relationships exist between patronage preferences in on-the-go consumption and the assortment offered as well as the opportunity to consume products without effort. Moreover, significant relationships between patronage preferences and consumers' time pressure as well as their health orientation exist. Consumers' income and their place of residence allow for limited inferences only. Based on the findings managerial recommendations are developed and avenues for further research are pointed out.