to Henry Chesborough (2003), modern open innovation is often seen as, "a sharp break from the paradigm of the early twentieth century when research labs were largely self sufficient only occasionally receiving outside visitors, and researchers would seldom venture out to visit universities or scientific expositions". In history, the "heroic inventor" is shown greater consideration than the cooperation of innovators. Stories of innovative heroes were believed to be more fascinating than other narratives, such as the stories of often nameless farmers, who created and shared new types of wheat on the Great Plains. This demonstrates the cultural shift that caused the "heroic inventor" to be nationally celebrated in Britain and all Western countries. Knowledge sharing often occurred in the past, though there is not enough evidence to prove whether or not it occurs more frequently today. However, it is known that tension has existed for some time between the depth and scope of open knowledge sharing and the patent system. Among the foremost examples of collective innovation in the past is Cleveland's Pig Iron industry in the UK during 1850–1870. This industry experienced a "free exchange of information about new techniques and plant designs among firms in an industry". According to economic historian Robert Allen, the proliferation of knowledge sharing in the iron district had two plausible reasons. First, afterword traveled of a prosperous blast furnace design, the reputations of engineers grew to be more positive. This only increased profits and allowed engineers to improve their careers. Second, such disclosures could cause the value of the revealing party's assets to decrease. Improving the blast furnace designs, in turn, led to an increase in the values of iron ore deposits, because these Cleveland ore mines were often owned by the blast furnace firms. This possibly made revealing technical information freely a profitable activity from the individual firm's point of view. Similarities can be drawn to today's communities of innovation, where the primary motivation for participants is recognition and potential career advancement, and for participating firms is related profit. It is yet to be understood how the rivalry between firms and innovators (that caused knowledge sharing to exist) came to be, while which conditions actually lead to aggressive rivalry and patenting. Bessen and Nuvolari (2011) mention that "... as the technology matures, the nature of firms rivalry, their willingness to share knowledge and their use of patents correspondingly change. In particular, knowledge