A geometric approach to portfolio optimization in models with transaction costs

We consider a continuous-time stochastic optimization problem with infinite horizon, linear dynamics, and cone constraints which includes as a particular case portfolio selection problems under transaction costs for models of stock and currency markets. Using an appropriate geometric formalism we show that the Bellman function is the unique viscosity solution of a HJB equation.Mathematics Subject Classification (1991): 60G44JEL Classification: G13, G11This research was done at Munich University of Technology supported by a Mercator Guest Professorship of the German Science Foundation (Deutsche Forschungsgemeinschaft). The authors also express their thanks to Mark Davis, Steve Shreve, and Michael Taksar for useful discussions concerning the principle of dynamic programming.     

The Expectations Hypothesis of the Term Structure and Time-Varying Risk Premia: a Panel Data Approach

One implication of the expectations hypothesis is that the yield spread should forecast subsequent changes in the long yield. However, regression tests based on this specification strongly reject the expectations hypothesis. One explanation for this rejection is that these tests fail to allow for a time varying risk premium that is correlated with this yield spread, leading to a bias in the estimated regression coefficients. This paper uses panel data in order to testm the expectations hypothesis under the assumption that risk premia are time-varying but driven by a single factor. It is found that while the expectations hypothesis is still rejected, the bias in the estimated coefficient is verysubstantially reduced.     

The influence of the institutional context on corporate illegality

This paper examines the relationship between the institutional environment and sustained corporate illegality. We find that cognitive assumptions generate expectations that can, under specific circumstances, induce organizations to amplify illegal actions and that serve to lessen regulatory scrutiny. We also find that, once initiated, illegal actions can become hidden because of institutionalized practices that enable their concealment and that weaken the prospect of detection. These processes and effects are particularly noticeable in networks of professional regulators who become mutually over-confident and over-influenced by each other to the extent that their independent critical assessments and judgements are compromised. Mechanisms of mimetic herding and social humiliation compromise independence of judgement. Networks of interacting professionals are thus vulnerable to a collectively induced lowering of regulatory vigilance.     

Manufacturing Industries in the UK: Was there Convergence during the 1968–1992 Period?

This paper uses detailed industry level time-series data for the UK regions which suggests that convergence (at least in terms of output-per-employee) was not occurring during the period 1968–92. Based on testing for unit roots, it is found that in a majority of industries and regions growth was divergent, and consequently there is little empirical support for the neoclassical 'long‐run catch up' model.     

Financing municipal BOOTs in South Africa: The lenders' perspective

South Africa's first build‐own‐operate‐transfer (BOOT) project for municipal services was signed in late December 1998 by the city of Durban and a private project company associated with French conglomerate Vivendi. The project will treat waste water for sale to industrial customers who would otherwise use more expensive potable water in their manufacturing processes. The project structure, with its multiple contracts and supporting agreements, guarantees and complex shareholding relationships, represents a sophisticated analytical challenge for lenders, whose financing will ultimately be at risk in the deal. Development finance institutions, such as the Development Bank of Southern Africa (DBSA), must review such projects in even greater detail because of their mandate to promote sustainable infrastructure development in the region. This article presents the DBSA ‘s analytical perspective on the Durban BOOT project in an effort to capture the complex, innovative and strongly developmental character of what, for South Africa, is a ground‐breaking public‐private partnership project.     

On the utility premium of Friedman and Savage

We re-examine the utility premium of Friedman–Savage [Friedman, Milton and Savage, Leonard J., “The Utility Analysis of Choices Involving Risk.” Journal of Political Economy 56, 1948, pp. 279–304.]. This measure is useful in understanding risky choices. For instance its reaction to an increased wealth equates to a precautionary demand for saving. We also analyze its two components.     

Consumer Socialization and the Role of Branding in Hazardous Adolescent Drinking

This study examines the relationship between alcohol marketing and consumer socialization to alcohol brands (assessed here using aided and unaided brand recognition and brand saliency), and the associated relationship between consumer socialization and hazardous alcohol consumption among a cohort of adolescents surveyed in Scotland. The research addresses gaps in the consumer socialization literature, by examining how marketing influences brand consumer socialization, and how brand consumer socialization influences subsequent hazardous consumption behavior over time, using a robust longitudinal design that assesses causal relationships while controlling for a wide range of important confounding variables. The results demonstrate the contribution of marketing to adolescents’ brand socialization to alcohol and the impact of this socialization on subsequent drinking behaviors. Implications for marketing managers, parents, policymakers, and consumer researchers are discussed, together with suggestions for future consumer research.     

What do we one the future? the construction of a better present

The debt-to-the-future issue is discussed taking into account that it is not simply a poetic or innocent statement but a present complex problem. An analytical approach through the issue of risk and uncertainty might allow us to delimit our reflection. At the same time, it might become the main axis in the reality we face today, since risk, reliability, and uncertainty appear as characteristic features of modern society. Participatory processes, as manifestations of post-normal science, are proposed as a way to cope with uncertainty.