Changing food patterns in West Africa: Implications for policy research

West African consumption of wheat and rice is growing rapidly despite technological barriers to production of these cereals in the region. Soaring imports are of particular concern in view of likely consumption trends. Maize imports are also growing rapidly, as is production in the more humid countries, to the detriment of sorghum. The latter is performing relatively better in the drier countries. Possible factors underlying consumption shifts are discussed, including price policies at variance with stated objectives. Possible policies to slow down these shifts are discussed, along with research requirements for effective diagnosis and implementation.     

Sulle polizze vita in regime d'inflazione

In questo lavoro viene postulata e analizzata, in regime d'inflazione, una determinata condizione d'indifferenza per il contraente verso una generica polizza vita.Essa, usata da sola e insieme ad una seconda condizione standard, permette di introdurre due indici di «commerciabilità» per dette polizze, uno relativo e l'altro assoluto.In presence of an inflation ratey>0, the «actual» annual rate of interest, , produced by a generical life assurance policy results lower than the «nominal»,i, fixed on the technical basis but at same time the policy-holder's disinclination for the risk decreases.We consider a determinate indifference condition for the policy-holder to a generical life assurance policy and examine the consequent relations among the variablesi, y and , the revaluation coefficient of the premiums, life annuity funds and insured capitals.In this paper we also introduce two indexes of «marketability» — one of them is relative and the other one is absolute — for a generical life assurance policy in inflation time.     

Word-of-mouth communications in marketing: a meta-analytic review of the antecedents and moderators

Although word-of-mouth (WOM) activity has been studied as an outcome variable of other constructs such as satisfaction, less attention has been given to the antecedents and moderators of WOM when considering WOM as a central construct. Hence, we propose a model of WOM antecedents and moderators using a meta-analytic review. The results show that all antecedents have significant effects on WOM activity, with customer commitment showing the strongest effect. The following hypotheses are also supported: (1) WOM valence is a significant moderator, (2) cross-sectional studies show a stronger influence of satisfaction and loyalty on WOM activity than longitudinal studies, and (3) studies of WOM behavior show a weaker link between loyalty and WOM activity than studies of WOM intentions. In addition, we show that satisfaction has a stronger relationship with positive WOM than loyalty, whereas (dis)loyalty has a stronger relationship with negative WOM than does (dis)satisfaction. We discuss this finding based on the different natures of positive and negative WOM. This article is based on the first author’s dissertation.     

Effectiveness of price discounts and premium promotions

Although price discounts are by far the most common form of sales promotions employed by firms, the increasing use of premiums as a promotional strategy may imply that they are occupying a more important place in the promotional strategy. Since price discounts are quite costly and can reduce consumers' reference prices, undermine perception of quality, and hurt brand equity, it is crucial to know what type of promotion is the most preferred and valued by consumers. As the most recent works in the field have argued that the promotional benefit level is an important determinant of promotional effectiveness, this research reports the results of two experimental studies that investigated the interaction effect between promotional benefit level and promotion type across three levels of benefit (low, moderate, high). The results obtained suggest that at high benefit levels price discounts are more effective than premiums, while the opposite occurs at low levels. However, a similar evaluation of promotional tools was found at moderate benefit levels. The findings offer guidance to managers who might benefit from knowing what is the best strategy to promote their products and services. Our work also extends prior related research because, to this date, the effectiveness of price discounts and premiums across promotional benefit levels is an under‐researched issue. © 2009 Wiley Periodicals, Inc.     

Geometric Asian options: valuation and calibration with stochastic volatility

The scaling properties of two alternative fractal models recently proposed to characterize the dynamics of stock market prices are compared. The former is the Multifractal Model of Asset Return (MMAR) introduced in 1997 by Mandelbrot, Calvet and Fisher in three companion papers. The latter is the multifractional Brownian motion (mBm), defined in 1995 by Péltier and Lévy Véhel as an extension of the very well-known fractional Brownian motion (fBm).

We argue that, when fitted on financial time series, the partition function as well as the scaling function of the mBm, i.e. of a generally non-multifractal process, behave as those of a genuine multifractal process. The analysis, which concerns the daily closing prices of eight major stock indexes, suggests to evaluate prudently the recent findings about the multifractal behaviour in finance and economics.     

Cross-cultural analysis of the global mindset and the internationalization behavior of small firms

This research analyzes the influence of a global mindset on the internationalization behavior of Norwegian and Portuguese small firms. It specifically sets out to assess the role of global orientation of the entrepreneur and firm perspectives on the global market. Based on a sample of 354 small firms, we used structural equation modeling to conduct our analysis. The results show the differing importance of a range of factors in explaining global mindset in different contexts. The global mindset of Norwegian entrepreneurs conditions their behavior and international experience, while for Portuguese entrepreneurs it affects the cognitive domain and their technical expertise. Global mindset and global orientation have more relevant effects on the internationalization behavior of Norwegian firms than that of Portuguese firms.     

Using mean-Gini and stochastic dominance to choose project portfolios with parameter uncertainty

Although a variety of models have been studied for project portfolio selection, many organizations still struggle to choose a potentially diverse range of projects while ensuring the most beneficial results. The use of the mean-Gini framework and stochastic dominance to select portfolios of research and development (R&D) projects has been gaining attention in the literature despite the fact that such approaches do not consider uncertainty regarding the projects’ parameters. This article discusses, with relation to project portfolio selection through a mean-Gini approach and stochastic dominance, the impact of uncertainty on project parameters. In the process, Monte Carlo simulation is considered in evaluating the impact of parametric uncertainty on project selection. The results show that the influence of uncertainty is significant enough to mislead managers. A more robust selection policy using the mean-Gini approach and Monte Carlo simulation is proposed.     

Debt Tax Shields Around the OECD World

Taxes affect a company’s optimal capital structure, value, and cost of capital, but their impact depends on the tax regime of the country where the company operates. The OECD classifies the tax regimes of its member countries in seven groups. In this paper we offer a general model that encompasses those seven groups. We show that tax benefits of debt vary significantly across tax systems, and that using either Modigliani and Miller’s (1963) or Miller’s (1977) formulas in other tax regimes can lead to quantitatively important mistakes. We also find a significantly positive relationship between average leverage in OECD countries and our indicator of tax shields.