Considerazioni sulla reciprocita' nei problemi di ottimo

In questo lavoro si stabiliscono alcune condizioni geometriche sull' immagine della funzione di cui si ricerca l'estremo e del vincolo per l'equivalenza tra problemi reciproci di estremo.

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In economics it is sometimes of interest to study constrained extremum problems. We give geometric conditions on the image set of the function of which we search the extremum and of the constrain for the equivalence between some reciprocal extremum problems.

     

Travel philanthropy and sustainable development: the case of the Plymouth–Banjul Challenge

Travel philanthropy is an evolving phenomenon. It owes its origins to rising frustrations with conventional aid and traditional philanthropic giving and is seen as development assistance enabling resources to flow directly from the tourism industry into community development and conservation initiatives. Philanthropists have long sought to achieve social transformation, and travel philanthropy in all its forms has evolved through the democratization of charity, as a kind of “doing good” through “giving back” whilst travelling. This paper evaluates values, practices and impacts of traditional, modern and post-modern philanthropy. Drawing upon evidence emerging from a longitudinal study, which involved the retrospective evaluation of personal diary entries, participant observations and semi-structured interviews about the transcontinental Plymouth–Banjul (car) Challenge (PBC), it exemplifies how an initiative can evolve across all three philanthropic approaches. It further debates critical understandings of the problematic travel philanthropy concept and its role in stimulating sustainable development in sub-Saharan Africa.     

The conservation against development paradigm in protected areas: Valuation of ecosystem services in the Doñana social-ecological system (southwestern Spain)

The ecosystems of the Doñana social-ecological system (southwestern Spain) provide numerous ecosystem services to society. We valued the most important ecosystem services through a market-based approach, revealed-preference and stated-preference methods to assess the conservation effectiveness of the Doñana Protected Area, with consideration of existing human activities in surrounding lands. We also analysed the spatial distribution of the ecosystem services beneficiaries and the scale of their related markets. We found a clear trade-off between the local and global market values of ecosystem services because landscape management outside of the Doñana Protected Area promotes the provision of ecosystem services associated with international markets. Our results suggest that a conservation against development model occurs in the Doñana social-ecological system, in which land use intensification takes place outside of the Protected Area borders as a result of promoting marketed ecosystem services, while biodiversity conservation is the main activity inside the Protected Area. We conclude that protected areas should be part of a larger-scale, adaptive landscape management strategy in which conservation planning should be the focal element in coordinating sectoral policies in the context of social-ecological systems.     

Mobile Dwelling Unit Developed by a Group of Mechanical Engineering Design Students

The increasing number of homeless people is one of the most burning problems of nowadays world. Society has to find the way to fight against it and provide help to those people that have no place to stay. For short-term interventions, the application of the mobile dwelling units seems to be the only possible solution. However, existing mobile dwelling units are rather limited to specific areas of application. A group of students faced this problem and decided to develop an alternative, more universal mobile dwelling unit that will fulfil a wide range of different technical and social requirements at a reasonable price. The paper describes a systematic approach to development of the mobile dwelling unit, which was performed as a part of the education process at the Faculty of Mechanical Engineering, University of Maribor. The project presented is interdisciplinary. In addition to the educational aspect that is emphasized in this paper, technical, economic and social aspects of the project have also a very important role. From educational point of view, the project was concluded successfully. Moreover, we believe our proposal for a mobile dwelling unit is both novel and suitable for general application. This revised version was published online in July 2006 with corrections to the Cover Date.     

Networks, clusters and innovation in tourism: A UK experience

In an era where tourism is dominated by requests for tailored experiences, SMEs play a key role in providing adequate products and services to tourists by responding to their most specific requirements.This paper uses network and clusters as a framework providing SMEs with innovative opportunities to operate in a competitive tourism environment. A review of relevant literature on clusters, networks and tourism business innovation is undertaken, then focusing on the specific issues of Healthy Lifestyle Tourism.The UK ‘Healthy Lifestyle Tourism Cluster’ experience is employed to discuss the process and the implication of network and cluster development in tourism. However, the development of clusters should not be seen as a simple and spontaneous process due to the nature of businesses involved, but as a very complex process linked to strong stakeholder collaboration.     

Female labour force participation in an era of organizational and technological change

Abstract The supply of skilled female labour increased significantly at the beginning of the twentieth century as women assumed positions in the newly created clerical workforce. Evidence suggests that despite this increase in labour supply, the wage paid to female clerical workers increased over the period and that the ratio of female clerical wages to male manufacturing wages was roughly constant. These labour market facts can be accounted for in a dynamic general equilibrium model in which an exogenous increase in human capital induces an increase in demand for skilled clerical workers. While induced technological change that favours skilled workers may account for the observed increase in female real wages, explaining the stagnate relative weekly wages paid to female clerical workers requires a framework that includes organizational change.