According to Paolo Sylos Labini (1920-2005), it is vital for an economist to be acutely conscious of the responsibility to study society for the sake of promoting progress—the economic, social and civil progress of society—and not for personal interest. In his last book, Ahi serva Italia...

In this paper I consider the 1991 Grossman-Helpman model which analyses the role of innovation on growth. The model assumes constant returns to scale. I intend to show what happen in this model if I assume strong increasing returns. In particular, under the assumption of increasing returns of...