This paper investigates the research and development activity of heterogeneous and rationally bounded firms. The latter conduct this activity through in-house research and by collecting information originating in other firms' spillovers. Thus, research and development activity owes both to...

The purpose of this paper is to investigate the evolutionary process of imitation and innovation as a process of searching in a given neighbourhood of firms. Networks are the main source of information for firms willing to actively search and upgrade and which define the reachable neighbourhood...

This paper attempts to generalise some results obtained in previous work showing the conditions under which paradigm setters emerge. We distinguish two different but definitely complementary and overlapping ways through which searching and learning occur. The first exploits the spillover...