. Teacher-learner interaction 2.0: knowledge dissemination in the area of economics in the third millennium.

English has become the dominant language in the higher education sector in Europe, as can be seen from objective indicators such as the growing number of degree programmes which use English as a medium of instruction (Gotti, 2014). As a consequence more than before in the past, the textbooks which are being used and consulted by students are written in English. In addition, besides being available in paper format, these textbooks can also sometimes be accessed on the Internet as ebooks and become available to an ever-increasing number of readers. The present study focuses on five different editions of one of the most well-known textbooks in the area of economics, P.A. Samuelson’s Economics. By looking at the differences among these five editions the analysis will explore the changes implemented, with a view to establishing how the process of knowledge dissemination has changed over the years. In particular, the revisions of the textbook will be shown to pay increasing attention to the readers’ expectations and needs, as writers deploy different rhetorical strategies in order to engage their addressees and make them accept their claims.