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This paper shows how some of the most important concepts of the New Institutional Economics (NIE) can be expressed in terms of Implementation Theory (IT). First, it explains some of the expressions used by the NIE, such as institutions, transaction costs, property rights and methodological individualism. Afterwards, it gives a wide definition of the IT in order to establish correspondences between both theories. [ABSTRACT FROM AUTHOR]

In the last decade, the concept of social capital has been widely accepted by academics, advisors and government officials, who have attributed to it virtuous effects on economic and social development. However, theoretical and applied literature gives many different meanings to the concept of social capital, leading to methodological difficulties. Thus, the concept of social capital is merely the entrance to a theoretical structure under construction, whose components and 'materials' come from different approaches. From a mainstream economics approach, the New Institutionalism offers important elements for the construction of this theory. [ABSTRACT FROM AUTHOR]