RELAXED UTILITY MAXIMIZATION IN COMPLETE MARKETS

For a relaxed investor—one whose relative risk aversion vanishes as wealth becomes large—the utility maximization problem may not have a solution in the classical sense of an optimal payoff represented by a random variable. This nonexistence puzzle was discovered by Kramkov and Schachermayer (1999) , who introduced the reasonable asymptotic elasticity condition to exclude such situations. Utility maximization becomes well posed again representing payoffs as measures on the sample space, including those allocations singular with respect to the physical probability. The expected utility of such allocations is understood as the maximal utility of its approximations with classical payoffs—the relaxed expected utility. This paper decomposes relaxed expected utility into its classical and singular parts, represents the singular part in integral form, and proves the existence of optimal solutions for the utility maximization problem, without conditions on the asymptotic elasticity. Key to this result is the Polish space structure assumed on the sample space.     

Economies with observable types

We study economies of asymmetric information with observable types. Trade takes place in lotteries. Individuals face a standard budget constraint, while the incentive compatibility constraints are imposed on the production set of the intermediaries. This formalization encompasses moral hazard, as in [Jerez, 2003] and [Jerez, 2005], and private information economies. Equilibrium allocations are constrained efficient, but, contrary to what stated for example in Jerez (2005), the set of equilibrium allocations may be empty and the Second Welfare Theorem may fail. This happens for two reasons. First, constrained efficient allocations may violate the necessary and sufficient conditions of price supportability for the individuals. Second, even when constrained efficient allocation are price supportable, they may fail to be a profit maximizing choice of the firm at the individual supporting prices. To restore existence of an equilibrium the firm has to be restricted to supply allocations with support in the set of incentive compatible contracts.     

Poverty and monetary transfers in Belarus: Some options for gradual reforms

In this paper we shall be analyzing gradual poverty reducing reforms for monetary transfers in Belarus. Some evidence is offered in support of the claim that the effectiveness of the existing 'categorical' system of transfers might be improved by redirecting resources to specific groups of households. Using a decomposition of households into socio-economic groups, feasible marginal reforms are suggested, and their robustness is checked by both experimenting with different poverty lines and introducing a simplified form of labour supply responsiveness. Based on these findings, a microsimulation of a hypothetical transfer change among different groups of households is run. According to this microsimulation, all aggregate poverty indicators could be reduced.     

Model averaging in risk management with an application to futures markets

This paper considers the problem of model uncertainty in the case of multi-asset volatility models and discusses the use of model averaging techniques as a way of dealing with the risk of inadvertently using false models in portfolio management. Evaluation of volatility models is then considered and a simple Value-at-Risk (VaR) diagnostic test is proposed for individual as well as ‘average’ models. The asymptotic as well as the exact finite-sample distribution of the test statistic, dealing with the possibility of parameter uncertainty, are established. The model averaging idea and the VaR diagnostic tests are illustrated by an application to portfolios of daily returns on six currencies, four equity indices, four ten year government bonds and four commodities over the period 1991–2007. The empirical evidence supports the use of ‘thick’ model averaging strategies over single models or Bayesian type model averaging procedures.     

Outsourcing,delocalization and firm organization: Transaction costs versus industrial relations in a local production system of Emilia Romagna

This article investigates the firms’ decisions to outsource, taking into account the impact of their embeddedness in a specific regional context on the relative entrepreneurial decision. It focuses on the role of industrial relations, as a factor that could interfere with the entrepreneurs’ decision of resorting to market relationships in discovering and exploiting new business opportunities. We study a local production system in Emilia Romagna (Northern Italy), i.e. the province of Reggio Emilia (RE), whose firms are characterized by a district kind of environment and where entrepreneurship develops in the presence of ‘thick’ industrial relations. The empirical part of the study shows that the role of transaction costs in explaining the outsourcing is blurred, while industrial relations have a stronger explanatory power. Furthermore, it seems that RE firms generally use outsourcing and international delocalization in complementary ways; however, the correlation depends on the activity and the nature of the delocalization channel. Outsourcing strategies appear to be affected by the pattern of socio-economic development in the region where the firms are located. In particular, the entrepreneurial decision to externalize a part of the production process seems to be related to the specific participatory, formal and informal mechanisms involved in regional development.     

Designing foresight studies for Nanoscience and Nanotechnology (NST) future developments

Nanoscience and Nanotechnology (NST) is widely considered as one of the most promising areas of scientific and technological development for future decades. As a consequence, almost every country in the world has chosen to invest significantly in this area. This choice, however, is only a first step in the investment decision process, given that almost any scientific discipline can be taken at the scale of a nanometre. In this paper, it is argued that foresight studies to decide where to invest in the nanotechnology area should be designed in a different way from what is normally done. Nanotechnology, in fact, has specific characteristics that should be taken into account when evaluating its expected impacts and potentialities.     

Effects of the complementarity of child nutrition and education on persistent deprivation

This letter shows how unfavourable nutritional status may affect the evolution of income independently from its impact on life spans. Multiple steady states might emerge when it is assumed that nutrition is a component of human capital.     

Determinants of the adoption of sustainability assurance statements: an international investigation

This paper explores the factors associated with voluntary decisions to assure social, environmental and sustainability reports. Since the market for assurance services in this area is in its formative stages, there is a limited understanding of the demand for this emergent non‐financial auditing practice, which is evolving rapidly across different countries. Drawing from extant literature in international auditing and environmental accounting, we focus on a set of country‐level institutional factors to explain the adoption of sustainability assurance statements among an international panel of 212 Fortune Global 250 companies for the years 1999, 2002 and 2005. Consistent with our expectations, our results provide evidence that companies operating in countries that are more stakeholder oriented and have a weaker governance enforcement regime are more likely to adopt a sustainability assurance statement. Further, the demand for assurance is higher in countries where sustainable corporate practices are better enabled by market and institutional mechanisms. Our exploratory findings also indicate that the likelihood of choosing a large accounting firm as assurance provider increases for companies domiciled in countries that are shareholder oriented and have a lower level of litigation. We conclude the paper by suggesting three directions of research in the area of sustainability assurance that have relevant academic and practical implications. Copyright © 2008 John Wiley & Sons, Ltd and ERP Environment.     

Has Ryanair's pricing strategy changed over time? An empirical analysis of its 2006–2007 flights

This paper analyzes the question of whether Ryanair's pricing strategies have changed over time. We create a panel dataset of fares for all of Ryanair's European flights over a two-year period, from 1 January 2006 to 31 December 2007. We calculate the average fare over a 90-day period prior to departure and the intensity of dynamic pricing for each flight in the panel, in particular analysing the changes in these variables observed between pairs of “equivalent” flights. Our results show that overall, both average fares and the intensity of dynamic pricing decreased in 2007. More than one-third of flights saw a price reduction of more than 10%. Now that it has become the dominant low-cost carrier in Europe, Ryanair appears to be softening its dynamic pricing activities on existing routes, typically employed to stimulate additional touristic demand. Thus, booking in advance becomes relatively more expensive.     

Central bank intervention and the intraday process of price formation in the currency markets

We propose a novel theory of the impact of sterilized spot interventions on the microstructure of currency markets that focuses on their liquidity. We analyze the effectiveness of intervention operations in a model of sequential trading in which i) a rational Central Bank faces a trade-off between policy motives and wealth maximization; ii) currency dealers' sole objective is to provide immediacy at a cost while maintaining a driftless expected foreign currency position; and iii) adverse selection, inventory, signaling, and portfolio balance considerations are absent by assumption. In this setting, and consistent with available empirical evidence, we find that i) the mere likelihood of a future intervention—even if expected, non-secret, and uninformative—is sufficient to generate endogenous effects on exchange rate levels, to increase exchange rate volatility, and to impact bid-ask spreads; and ii) these effects are exacerbated by the intensity of dealership competition, the extent of the Central Bank's policy trade-off, and the credibility of its threat of future actions.