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on Network Economics |
| By: | Mölleryd, Bengt G.; Markendahl, Jan; Sundquist, Mårten |
| Date: | 2014 |
| URL: | http://d.repec.org/n?u=RePEc:zbw:itse14:101392&r=net |
| By: | Georg, Co-Pierre |
| Abstract: | When banks choose similar investment strategies, the financial system becomes vulnerable to common shocks. Banks decide about their investment strategy ex-ante based on a private belief about the state of the world and a social belief formed from observing the actions of peers. When the social belief is strong and the financial network is fragmented, banks follow their peers and their investment strategies synchronize. This effect is stronger for less informative private signals. For endogenously formed interbank networks, however, less informative signals lead to higher network density and less synchronization. It is shown that the former effect dominates the latter. |
| Keywords: | social learning,endogenous financial networks,multi-agent simulations,systemic risk |
| JEL: | G21 C73 D53 D85 |
| Date: | 2014 |
| URL: | http://d.repec.org/n?u=RePEc:zbw:bubdps:232014&r=net |
| By: | Kühne, Bianka; Lefebvre, Virginie; Gellynck, Xavier |
| Abstract: | Knowledge exchange is a prerequisite for learning and consequently for innovation. Through open innovation, the innovating firms establish ties with other organizations, in order to innovate. At the baseline, open innovation is thus the exchange of knowledge through in- and out-flows of the knowledge at a company. Formal networks can provide access to other organizations and otherwise unavailable knowledge and resources and are seen as the locus of innovation. Four main categories of knowledge exchange can be distinguished: socialization, combination, articulation, and internalization. Within these categories, distinct but interdependent processes of knowledge exchange take place as described in the innovation production process (IPP) which consists of three main steps, knowledge accumulation, knowledge transformation, and knowledge exploitation (Roper et al., 2008). The objective of this paper is to explore how formal networks contribute to the categories of knowledge exchange and to each of the three steps of the IPP in order to conclude on how networks can facilitate open innovation among their members. Data are collected by means of three case-studies conducted in three Flemish formal networks which focus on enhancing the innovativeness and learning capabilities of micro, small and medium sized enterprises (SMEs). Our findings confirm the importance of networks in the process of knowledge exchange and innovation for SMEs in the food sector. The most important role of the networks is to create the appropriate environment according to the type of knowledge and the step(s) in the innovation production process focused on. Furthermore, it appears to be a very important task of the network to stimulate actively knowledge transformation into innovation outputs such as new or improved technology or product prototypes. Thereby, not only short-term effects should be aimed at, but also long-term effects e.g. for organizational innovation, should be taken into account. In conclusion, all three networks follow very different approaches in order to facilitate, stimulate and support knowledge exchange and innovation among their members. Based on the results, managerial as well as policy implications are posed towards network members, i.e. the SMEs, network coordinators and researchers. |
| Keywords: | knowledge exchange, learning, triple helix networks, SMEs, food industry, Agribusiness, Food Consumption/Nutrition/Food Safety, Research Methods/ Statistical Methods, |
| Date: | 2013–09 |
| URL: | http://d.repec.org/n?u=RePEc:ags:iefi13:164742&r=net |
| By: | Takayuki Mizuno (National Institute of Informatics, Department of Informatics, The Graduate University for Advanced Studies, PRESTO, Japan Science and Technology Agency, Graduate School of Economics, University of Tokyo, The Canon Institute for Global Studies); Wataru Souma (College of Science and Technology, Nihon University); Tsutomu Watanabe (Graduate School of Economics, University of Tokyo, The Canon Institute for Global Studies) |
| Abstract: | In this paper, we investigate the structure and evolution of customer-supplier networks in Japan using a unique dataset that contains information on customer and supplier linkages for more than 500,000 incorporated non-financial firms for the five years from 2008 to 2012. We find, first, that the number of customer links is unequal across firms; the customer link distribution has a power-law tail with an exponent of unity (i.e., it follows Zipf's law). We interpret this as implying that competition among firms to acquire new customers yields winners with a large number of customers, as well as losers with fewer customers. We also show that the shortest path length for any pair of firms is, on average, 4.3 links. Second, we find that link switching is relatively rare. Our estimates indicate that the survival rate per year for customer links is 92 percent and for supplier links 93 percent. Third and finally, we find that firm growth rates tend to be more highly correlated the closer two firms are to each other in a customer-supplier network (i.e., the smaller is the shortest path length for the two firms). This suggests that a non-negligible portion of fluctuations in firm growth stems from the propagation of microeconomic shocks – shocks affecting only a particular firm – through customer-supplier chains. |
| Date: | 2014–11 |
| URL: | http://d.repec.org/n?u=RePEc:upd:utppwp:033&r=net |
| By: | Manuel Foerster (CES - Centre d'économie de la Sorbonne - CNRS : UMR8174 - Université Paris I - Panthéon-Sorbonne, CORE - Center of Operation Research and Econometrics [Louvain] - Université Catholique de Louvain (UCL) - Belgique); Michel Grabisch (CES - Centre d'économie de la Sorbonne - CNRS : UMR8174 - Université Paris I - Panthéon-Sorbonne, EEP-PSE - Ecole d'Économie de Paris - Paris School of Economics - Ecole d'Économie de Paris); Agnieszka Rusinowska (CES - Centre d'économie de la Sorbonne - CNRS : UMR8174 - Université Paris I - Panthéon-Sorbonne, EEP-PSE - Ecole d'Économie de Paris - Paris School of Economics - Ecole d'Économie de Paris) |
| Abstract: | We study a stochastic model of influence where agents have "yes" or "no" inclinations on some issue, and opinions may change due to mutual influence among the agents. Each agent independently aggregates the opinions of the other agents and possibly herself. We study influence processes modeled by ordered weighted averaging operators, which are anonymous: they only depend on how many agents share an opinion. For instance, this allows to study situations where the influence process is based on majorities, which are not covered by the classical approach of weighted averaging aggregation. We find a necessary and sufficient condition for convergence to consensus and characterize outcomes where the society ends up polarized. Our results can also be used to understand more general situations, where ordered weighted averages are only used to some extent. Furthermore, we apply our results to fuzzy linguistic quantifiers, i.e., expressions like "most" or "at least a few". |
| Keywords: | Influence; Anonymity; Ordered weighted averaging operator; Convergence; Consensus; Fuzzy linguistic quantifier |
| Date: | 2013 |
| URL: | http://d.repec.org/n?u=RePEc:hal:journl:halshs-00913235&r=net |
| By: | Fariha Kamal; Asha Sundaram |
| Abstract: | Using confidential U.S. customs data on trade transactions between U.S. importers and Bangladeshi exporters between 2002 and 2009, and information on the geographic location of Bangladeshi exporters, we show that the presence of neighboring exporters that previously transacted with a U.S. importer is associated with a greater likelihood of matching with the same U.S. importer for the first time. This suggests a role for business networks among trading firms in generating exporter-importer matches. Our research design also allows us to isolate potential gains from neighborhood exporter presence that are partner-specific, from overall gains previously documented in the literature. |
| Keywords: | exporter-importer match, trade networks, partner-specific spillovers |
| JEL: | F1 F14 L14 R12 |
| Date: | 2014–10 |
| URL: | http://d.repec.org/n?u=RePEc:cen:wpaper:14-44&r=net |
| By: | Bryan S. Graham |
| Abstract: | Social and economic networks are ubiquitous, serving as contexts for job search, technology diffusion, the accumulation of human capital and even the formulation of norms and values. The systematic empirical study of network formation - the process by which agents form, maintain and dissolve links - within economics is recent, is associated with extraordinarily challenging modeling and identification issues, and is an area of exciting new developments, with many open questions. This article reviews prominent research on the empirical analysis of network formation, with an emphasis on contributions made by economists. |
| JEL: | C23 C25 D85 |
| Date: | 2014–08 |
| URL: | http://d.repec.org/n?u=RePEc:nbr:nberwo:20414&r=net |
| By: | Klein, Gordon J.; Wendel, Julia |
| Abstract: | For more than a decade the unbundling of telecommunications networks has been used as a regulatory means to stifle competition. However, despite its assumed positive effects on market entry and competition intensity, the negative effects on network investment incentives are widely shown in the theoretical literature. Therefore broadband penetration might also be affected negatively. In our paper we concentrate on the impact of local loop unbundling and Bitstream access on broadband penetration. Using a panel of European countries for a time period of 17 years, we find that the effect of unbundling on penetration is positive when an intermediate level of broadband penetration has been achieved in a country. However, this impact turns negative if the initial level of broadband penetration is rather low or high. We argue that this confirms possible negative effects on investment incentives, but may successfully lower prices to foster demand. These are two findings which should be carefully considered by policy makers when deciding on unbundling policies. |
| Keywords: | Broadband Internet Penetration,Local Loop Unbundling,Bitstream Access,Policy Evaluation,Panel Data Analysis |
| Date: | 2014 |
| URL: | http://d.repec.org/n?u=RePEc:zbw:dicedp:163&r=net |
| By: | Jean-François Caulier (CES - Centre d'économie de la Sorbonne - CNRS : UMR8174 - Université Paris I - Panthéon-Sorbonne); Michel Grabisch (CES - Centre d'économie de la Sorbonne - CNRS : UMR8174 - Université Paris I - Panthéon-Sorbonne, EEP-PSE - Ecole d'Économie de Paris - Paris School of Economics - Ecole d'Économie de Paris); Agnieszka Rusinowska (CES - Centre d'économie de la Sorbonne - CNRS : UMR8174 - Université Paris I - Panthéon-Sorbonne, EEP-PSE - Ecole d'Économie de Paris - Paris School of Economics - Ecole d'Économie de Paris) |
| Abstract: | Most allocation rules for network games presented in the literature assume that the network structure is fixed. We put explicit emphasis on the construction of networks and examine the dynamic formation of networks whose evolution across time periods is stochastic. Time-series of networks are studied that describe processes of network formation where links may appear or disappear at any period. Moreover, convergence to an efficient network is not necessarily prescribed. Transitions from one network to another are random and yield a Markov chain. We propose the link-based allocation rule for such dynamic random network formation processes and provide its axiomatic characterization. By considering a monotone game and a particular (natural) network formation process we recover the link-based flexible network allocation rule of Jackson. |
| Keywords: | Dynamic networks; network game; link-based allocation rule; Markov chain; characterization |
| Date: | 2013–08 |
| URL: | http://d.repec.org/n?u=RePEc:hal:journl:halshs-00881125&r=net |