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This study explores the circumstances under which certain collaborative tools are adopted, and whether some tools are typically used in combination with others. In the practical field, it is necessary to determine an objective measurement system of these externalities, and the development of a joint analysis of the triple bottom line.

#Duly noted traduccion free

In the theoretical field remains to be resolved the fit of positive and negative externalities, social or environmental, with free competition. The last directive of the European Union, and initiatives of various countries, such as the Social Value Act of Great Britain make effort in the inclusion of social and environmental performance-sustainability- into the equation however, it is an issue that still It has not been addressed in depth from the field of research, neither at a theoretical level nor at a practical level. Thus, public purchase studies should include sustainability perspective because the mere reduction to cost based decisions do not encourage social and environmental sustainability and for that reason neither the public authorities. The volume of public purchase and public procurement is very high in Europe then public authorities in the EU spend at least 14% of GDP on the purchase of services, works and supplies €2 trillion yearly. Then, it is required to public entities to contribute to common good, and popularized mechanism is the public purchase. It is for the relevant for the society, as well. There are a lot of papers that contribute to measuring social performance but most of them are focus on organizational management and companies’ point of view but there is a gap to analyze the sustainability from a public authority’s point of view. The consolidation of these results reflects the real value that an organization contributes or detracts for the stakeholders of organization.

This sustainability reflects the demand for positive results, not only in the economic sphere, but also in the social and environmental area. In the XXI century the analysis about the equivalence between the social optimum and the maximization of the benefit has increased and therefore the sustainability emerges as a value in the organi zations and in the economy.