ABSTRACT : The objective of this work is, on the one hand, to study the new competitive forms that correspond to the development of the different markets linked to electronic platforms and social networks on the Internet. On the other hand, to develop a proposal for social welfare for the positive and negative impacts produced by the development of these markets. In the first part, the main social and economic changes inherent to political and social evolution are addressed. The main logical trends of the market are presented about production and modalities of information appropriation, in particular the new forms of information asymmetries in the electronic market.
KEYWORDS: Imperfections information; Network Economy; Social Welfare; Democracy, Digital Capitalism.