Social network thresholds in the diffusion of innovations

Valente, Thomas W.

doi:10.1016/0378-8733(95)00256-1

Cited by 817 publications

(546 citation statements)

References 34 publications

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“…But producers benefit from urban economies as well. For example, Valente (1996) found that innovativeness of Brazilian farmers was directly related to the number of trips they took to the closest major city. In addition to key factors such as transportation costs associated with both forward and e on the stability of distance thresholds…”

Section: 4: Spatial Distributionmentioning

confidence: 99%

“…But producers benefit from urbanization economies as well. For example, Valente (1996) found that innovativeness of Brazilian farmers was directly related to the number of trips they took to the closest major city. In both forward and backward linkages in the supply chain or access to markets, diffusion effects of knowledge may also play a key role not only in location decisions but also business success.…”

Section: 4: Spatial Distributionmentioning

confidence: 99%

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Implications of Local and Regional Food Systems: Toward a New Food Economy in Portland, Oregon

Mertens¹

2000

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The local food movement in the Portland Metro Region of Oregon is as prevalent as anywhere in the Country. To a large degree this is driven by the Portland Metro area food culture and the diverse agricultural landscape present in the Willamette Valley and throughout the State. Portlanders demand local food and thus far the rural periphery has been able to provide it; driving a new food economy that has economic implications throughout the region. As this regional food economy emerges much attention has been focused on harnessing its power for economic development perpetuated by the belief that there exists an opportunity to foster a cluster of economic activity pertaining to the production, processing, distribution and sale of regional foods that might generate economic opportunities throughout the value chain.The research presented here constitutes an attempt to characterize the local and regional food system that currently exists in the Portland Metro Region and to bring to light the opportunities present at the regional scale that link the agricultural periphery to the urban core. I present two different definitions of local and regional food systems and show how these different conceptions have very different implications for economic development.Once defined, I test for differences between local and regional food systems and the export-oriented, agro-food sector by analyzing aspects of geographic space and processes of knowledge accumulation and innovation in the context of aspects of regional economic ii development such as agglomeration economies, knowledge spillovers, business life cycle and industrial location.My analysis showed that there are significant differences between local and regional food systems and the export-oriented agro-food industry specific to supply chains, actors and products of the different systems. Furthermore, through spatial analysis, I found that there are differences in terms of the spatial structure and distribution between producers who participate in the different systems. Local and regional producers tend to cluster closer together at smaller scales, are smaller in size and are found to be closer to the urban core. Through a qualitative inquiry I found that this clustering facilitates forces of agglomeration economies specific to food producers who participate in local and regional supply chains, particularly non-pecuniary effects of knowledge accumulation. This underlying structure has significant effects on economic outcomes and as such has implications in terms of regional economic development when local and regional food systems are considered in terms of the city-region.iii Acknowledgements

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Section: 4: Spatial Distributionmentioning

confidence: 99%

Section: 4: Spatial Distributionmentioning

confidence: 99%

Implications of Local and Regional Food Systems: Toward a New Food Economy in Portland, Oregon

Mertens¹

2000

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“…influential members in local communities, which is an old topic in the field of social science [20]. Until now, finding leaders and analyzing their social influences in various types of social networks is still an appealing topic [21]- [23]. In regard to this important property, recently there has been a new trend of community detection methods by means of community leaders as the pivotal members.…”

Section: Introductionmentioning

confidence: 99%

Detecting Community Structure in Dynamic Social Networks Using the Concept of Leadership

Javadi

Gharani

Khadivi

2018

Studies in Systems, Decision and Control

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Abstract-Detecting community structure in social networks is a fundamental problem empowering us to identify groups of actors with similar interests. There have been extensive works focusing on finding communities in static networks, however, in reality, due to dynamic nature of social networks, they are evolving continuously. Ignoring the dynamic aspect of social networks, neither allows us to capture evolutionary behavior of the network nor to predict the future status of individuals. Aside from being dynamic, another significant characteristic of realworld social networks is the presence of leaders, i.e. nodes with high degree centrality having a high attraction to absorb other members and hence to form a local community. In this paper, we devised an efficient method to incrementally detect communities in highly dynamic social networks using the intuitive idea of importance and persistence of community leaders over time. Our proposed method is able to find new communities based on the previous structure of the network without recomputing them from scratch. This unique feature, enables us to efficiently detect and track communities over time rapidly. Experimental results on the synthetic and real-world social networks demonstrate that our method is both effective and efficient in discovering communities in dynamic social networks.

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“…Information providers assume an authoritative role. They believe the opinions they express regarding various goods and services should be followed or at least acknowledged for its value to information recipients (Valente, 1996). Information providers go beyond their closest social circles to gather information, often turning to social contacts in other cities.…”

Section: Relational Linkagesmentioning

confidence: 99%

Examining the dissemination of innovations in the sporting goods industry.

Hambrick¹

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Social network thresholds in the diffusion of innovations

Cited by 817 publications

References 34 publications

Implications of Local and Regional Food Systems: Toward a New Food Economy in Portland, Oregon

Implications of Local and Regional Food Systems: Toward a New Food Economy in Portland, Oregon

Detecting Community Structure in Dynamic Social Networks Using the Concept of Leadership

Examining the dissemination of innovations in the sporting goods industry.

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