This paper shows that there is a link between economics and politics in the study of collective and public choice. More precisely, it sustains that government policy (or strateçtc planning) are influenced by the political process and it depends on the organization of society in rent-seeking pressure groups. The first part analyses the exogenous constraints to individual action in the state; the second part deals with the agency matter by studying the role of the internal constraints to individual action inside the organization. The conclusion discusses how this view about government policy introduced here must complement the traditional point of view about the analysis of the political process and public agents'actions.
government policies; rational choice; public choice; constitutional economics; institutional economics