... point in time there are: i) two distinct groups of users; ii) the value obtained by one type of user increases with the number or with the ‗quality‘ of the other kind of users; and iii) an intermediary ... tastes of users and signaling when something of interest comes up, by providing means for the buyer to assess the quality or the aspect of the good, the reputation of the sellers, and by providing ... I of the larger project on Internet intermediaries. It develops a common definition and understanding of what Internet intermediaries are, of their economic function and economic models, of...