A strategic analysis of network reliability

Abstract. We consider a non-cooperative model of information networks where communication is costly and not fully reliable. We examine the nature of Nash networks and efficient networks. We find that if the society is large, and link formation costs are moderate, Nash networks as well as efficient networks will be ‘super-connected’ i.e. every link is redundant in the sense that the network remains connected even after the link is deleted. This contrasts with the properties of a deterministic model of information decay, where Nash networks typically involve unique paths between agents. We also find that if costs are very low or very high, or if links are highly reliable then there is virtually no conflict between efficiency and stability. However, for intermediate values of costs and link reliability, Nash networks may be underconnected relative to the social optimum.     

The stability and efficiency of directed communication networks

Abstract. This paper analyzes the formation of directed networks where self-interested individuals choose with whom they communicate. The focus of the paper is on whether the incentives of individuals to add or sever links will lead them to form networks that are efficient from a societal viewpoint. It is shown that for some contexts, to reconcile efficiency with individual incentives, benefits must either be redistributed in ways depending on “outsiders” who do not contribute to the productive value of the network, or in ways that violate equity (i.e., anonymity). It is also shown that there are interesting contexts for which it is possible to ensure that efficient networks are individually stable via (re)distributions that are balanced across components of the network, anonymous, and independent of the connections of non-contributing outsiders.     

FROM EXOGENOUS TO ENDOGENOUS ECONOMIC NETWORKS: INTERNET APPLICATIONS

Abstract.  Economic agents' behaviour is affected by their position in a network, either exogenous or endogenous, in which they interact with a sub-set of neighbours only. The network's links, which may be generated by vertical and/or horizontal relations, or by more complex morphologies, may explain the transition between dynamic equilibria and the instability of economic aggregates. Moreover, networks shape strategic interaction among agents by determining their strategies; the problem of access and interconnection, particularly relevant in the Internet, is perhaps the best example. A two-way feedback between strategies and network structures arises instead when links are endogenous: those features are clearly shown in the mechanism underlying the formation of peering links and R & D networks.     

Synergistic effects and the co-existence of networks in clusters

Abstract

Network systems like clusters are characterized by the coexistence of relational architectures with ties and nodes of different nature. While recent research has analysed how a set of structural features shape the dynamics and effects of one cluster network, the outstanding question is to what extent such features and outcomes are influenced by the concomitance of distinct content-related linkages. This paper integrates both network and evolutionary economic geography perspectives to develop and test a model that links innovation performance with the benefits that stem from technical and business relations. Data collected in a biotech cluster in the Valencia region (Spain) demonstrate the changing effect of brokerage and overlapping ties on innovation as a function of knowledge shared. Findings extend the theoretical understanding of how knowledge diffuses in clusters and provide valuable insights for both practitioners and policy makers.     

Termination Clauses in Long-Term Contracts

Many long-term contracts incorporate a termination clause. This paper argues that when agents have hidden information, such a clause has a beneficial incentive effect—it enables a principal to screen agents' private information at a lower cost. In a two-period model, this paper characterizes the optimal long-term contract with a termination clause, which specifies that the principal will switch agents in the second period when the first-period cost is high. The analysis delineates how the optimality of this clause depends on the intertemporal cost correlation structure, on the limits to agents' liability, and on the principal's degree of commitment.     

Social Resources

Abstract

This paper advances the ideas that host country nationals, i.e., patriates, constitute an important part of the social environment of an expatriate. Social network theory is used to provide a framework from which to examine expatriate-patriate relationships on the individual, dyad, and group levels. Specifically, it is proposed that expatriate-patriate links, as well as characteristics of the social group in which the expatriate exists, contribute to expatriate effectiveness through their help with shaping work and nonwork networks of information and contacts. It is also recommended that where appropriate, patriate expertise be incorporated into human resource decisions related to the expatriation process. Suggestions on how to accomplish this integration are also offered.     

Local Economic Structure and Growth

Abstract

This paper tests how the local economic structure—measured by local sector specialization, competition and diversity—affects growth of manufacturing sectors. Most of the empirical literature assumes that in the long run more productive regions will attract more workers and use employment growth as a measure of local productivity growth. However, this approach is based on strong assumptions, such as those of national labour markets and homogeneous labour. This paper shows that if we relax these assumptions, regional adjusted wage growth is a better measure of productivity growth than employment growth. This measure is used in order to study regional growth in Portuguese regions between 1985 and 1994. Evidence is found of MAR externalities in some sectors and no evidence of Jacobs or Porter externalities in most of the sectors. These results are at odds with the findings for employment-based regressions, which show that regional concentration and the region's size have a negative effect in most of the sectors. It is also shown that simply using regional wage growth would overstate the effect of regional concentration and competition on long-run growth.     

城市尺度的网络竞争力研究

随着全球化和城市化进程的加快,城市之间的竞争也越来越白热化.论文将城市竞争力与城市之间的多维联系网络相结合,不但关注体现城市节点内部属性的发展指标,而且还将城市节点之间的联系和结构与这些发展指标相结合,运用社会网络分析(SNA)得出城市在网络中的竞争力,并在此基础上提出了网络竞争力的概念模型和分析框架,丰富了现有的城市竞争力理论.     

Uniqueness of Arrow-Debreu and Arrow-Radner equilibrium when utilities are additively separable

This survey paper has three purposes: We first present in finite dimension, different approaches to the problem of uniqueness of Arrow-Debreu equilibrium when agents have additively separable utilities. We then study how, in the specific framework of a two period contingent good economy the results obtained generalize to infinite dimension. We consider economies where agents' consumption space is and agents' utilities are additively separable. Lastly, we show that in some restricted settings, some results may be used to prove uniqueness of Arrow-Radner equilibria when there are incomplete financial markets.     

Knowledge-sharing rewards in enterprise social networks: effects of learner types and impact of digitisation

ABSTRACT

The era of total digitisation demands companies to seek innovative approaches in managing digital assets. This paper presents and studies an analytical model of an enterprise social network (ESN) employed by organisations in facilitating knowledge sharing and learning. Exploring the design of reward systems that motivate workers to share knowledge, we focus on how the dominant type of learners (avid or impressionable), the network structure of the ESN, and digitisation affect the reward systems. This research provides valuable insights for practitioners to implement appropriate reward systems to promote knowledge sharing and learning in ESNs.     

On the smoothness of optimal paths

Abstract The aim of this paper is to study the differentiability property of optimal paths in dynamic economic models. We address this problem from the point of view of the differential calculus in sequence spaces which are infinite-dimensional Banach spaces. We assume that the return or utility function is concave, and that optimal paths are interior and bounded. We study the C ^r differentiability of optimal paths vis-à-vis different parameters. These parameters are: the initial vector of capital stock, the discount rate and a parameter which lies in a Banach space (which could be the utility function itself). The method consists of applying an implicit function theorem on the Euler–Lagrange equation. In order to do this, we make use of classical conditions (i.e., the dominant diagonal block assumption) and we provide new ones. Mathematics Subject Classification (2000): 90A16, 49K40, 93C55 Journal of Economic Literature Classification: C161, D99, O41     

Embeddedness in context: understanding gender in a female entrepreneurship network

ABSTRACT

In this paper I argue that through a process of embeddedness in context, a female entrepreneurship network is able to challenge gender structures. I investigate how a female entrepreneurship network is constructed and how they reinforce and possibly challenge existing gender structures. From an ethnographic study, three processes in the female entrepreneurship network were identified: making proper entrepreneurs, building relationships and engaging in change. In the different processes the women involved in the network reinforced gender structures through compliance with a masculine discourse of entrepreneurship, but also challenged gender structures through questioning this discourse. Through becoming embedded in their local community, the women entrepreneurs were able to take charge of the development of the network and challenge gender structures as a result of questioning the masculine discourse of entrepreneurship. This implies an interplay between embeddedness and gender as two separate but dependent processes. Linking together gender and embeddedness elicits a new take on the way female entrepreneurship networks are constructed and how they could advance gender equality within entrepreneurship. Consequently, this paper emphasises a need for further examination of embeddedness within gender and entrepreneurship research.     

Cointegration, causality and the transmission of shocks across wheat market in Pakistan

This paper uses quarterly price data and examines the transmission of shocks across different spatially separated locations besides identifying causality among these locations. Johansen and Juselius’s (Econ. Stat., 52, 160–210, 1990) multivariate cointegration procedure identified two cointegrating vectors among these locations. Following Toda and Yamamoto (J. Econom., 66, 225–250, 1995), causality tests showed only one bi-directional causality and it was between Peshawar and Hyderabad locations. Faisalabad and Sargodha appeared independent (i.e. exogenous) market locations in price discovery process. Peshawar market showed maximum (i.e. 5) number of significant links. The generalized impulse response functions, though, suggested similar (cyclical) pattern of responses across the markets, but their time profile, which provides insight into the system’s speed of convergence to long run equilibrium path, varied with different level of extent and persistency. Responses to shock originating in consumption markets (i.e. Karachi, Peshawar and Lahore) remained short lived; whereas the shocks stemming from surplus wheat producing locations (i.e Multan, Sargodha and Faisalabad) produced long and more persistent responses.      

Welfare targeting in networks

This paper investigates welfare targeting for public goods in networks. First, we show that a tax/subsidy scheme (not necessarily budget-balanced) affects each consumer only insofar as it affects his neighbourhood. Second, we show that either a Pareto-improving income redistribution can be found or there exist Negishi weights, which we relate to the network structure. Third, in the case of Cobb–Douglas preferences, we show that a Law of Welfare Targeting holds and links two well-known notions of the comparative statics of policy interventions: neutrality and welfare paradoxical effects. Collectively, our findings uncover the importance of the $-1$ eigenvalue to economic and social policy: it is an indication of how consumers absorb the impact of income redistribution.     

What Governance Roles do Municipalities use in Dutch Local Social Support Networks?

Abstract

Until now, there is no consensus about variations in governance roles. This consensus is necessary to enable researchers to examine how network are governed well. In this article, the governance roles are considered to be clusters of consistent choices on a top-down versus bottom-up continuum, regarding nine governance activities. Our results reveal that three governance roles can be discerned: top-down, intermediate and bottom-up governance roles. Furthermore, these roles are applied by municipalities with specific (network) characteristics. Our results open the black box of network governance and might facilitate municipalities to make choices regarding their role in the new network era.     

Organizational Structure and Product Market Competition

This paper explores the link between delegation of authority and product market competition. It considers a firm that is contemplating entering a market served by an incumbent. The firm can adopt either a decentralized or a centralized authority structure. In the former, authority is delegated to an agent, while in the latter, it is retained by the principal. We address the questions of how the toughness of future product market competition affects the delegation decision, and how this decision in turn affects product market competition. The delegation decision is determined by a trade‐off between inducing the agent to take greater initiative and accepting lower operating profits from a less efficient decision taken by the agent.     

Effect of Certificate of Need Law on the intensity of competition: The market for emergency care

PurposeThis article aims to contribute to the academic literature in better understanding the impact of Certificate of Need (CON) Law on Emergency Department (ED) care. Impact of CON Law on ED competition remains an unanswered empirical question.MethodsWe examine the impact of CON Law and its stringency on the intensity of competition (rivalry among competitors) between EDs measured by the Herfindahl-Hirschman Index (HHI). We then estimate the effects of CON Law on HHI by treating CON as an exogenous (endogenous) variable.FindingsOn average the CON legislation enhances ED competition. A possible reason is that the law hinders predatory behavior, and therefore acts as an effective anti-trust tool. Other findings indicate that competition is found to be positively related to a state's population size and median income and negatively related with the prevalence of employer provided insurance and magnitude of illegal immigration in a state.Practical implicationsThis article sheds some light on how political regulations could affect healthcare market and hence may provide public policy makers some insights on reducing healthcare cost.OriginalityOur analysis of the impact of CON regulation on ED competition significantly contributes to the healthcare and strategy literature. The law potentially serves as an anti-trust tool in the hands of the government. We extend the empirical literature by treating CON Law and its stringency as exogenous (endogenous). Our comprehensive analysis considers a host of control variables such as population demographics, their health status and access to health care, healthcare facilities, political environment, in addition to the CON features.     

Drivers of exploitative and explorative innovation in a collaborative public-sector context

ABSTRACT

This paper studies multilevel networks, in which municipalities collaborate with higher tiers of government (upward collaboration), with peers (outward) and with local stakeholders (inward) to discover innovative ways to create public value. A set of hypotheses was developed on the effects of three forms of collaboration (i.e. inward, outward and upward) on two types of innovation (i.e. exploitative and explorative innovation). A range of network and municipality characteristics was also considered. The model was tested by capturing the perceptions of 656 municipal representatives. The research findings provide evidence of complex links between forms of collaboration and types of innovation.     

Network formation models with costs for establishing links

Abstract. In this paper we study endogenous formation of communication networks in situations where the economic possibilities of groups of players can be described by a cooperative game. We concentrate on the influence that the existence of costs for establishing communication links has on the communication networks that are formed. The starting points in this paper are two game-theoretic models of the formation of communication links that were studied in the literature fairly recently, the extensive-form model by Aumann and Myerson (1988) and the strategic-form model that was studied by Dutta et al. (1998). We follow their analyses as closely as possible and use an extension of the Myerson value to determine the payoffs to the players in communication situations when forming links is not costless. We find that it is possible that as the costs of establishing links increase, more links are formed.     

Factors shaping the international knowledge connectivity of industrial clusters: a comparative study of two Latin American cases

Abstract

Recent research has emphasized that success of industrial clusters is not only driven by intra-cluster knowledge sharing (‘local buzz’) but also by externally sourced knowledge (‘global knowledge pipelines’). This article examines the factors that determine the channels through which clusters connect with global knowledge pipelines depending on the structure of the global value chain within which they are inserted, their knowledge base and their stage of evolution. Building on a comparative case study of the salmon farming cluster in Chile and the software cluster in Costa Rica, we adopt an evolutionary perspective based on historical analysis to better understand how the configuration of clusters’ international knowledge linkages shifts over time. Our findings suggest that (i) the more hierarchical the global value chain structure, the less room for knowledge co-creation between local and foreign actors; (ii) clusters relying on analytical knowledge bases opt for more formal and coordinated links with high involvement of public actors, whereas in clusters relying on synthetic knowledge bases, international knowledge interaction is based on less formal links mainly between business actors; and (iii) as clusters evolve the channels through which they connect with foreign knowledge increase in number and new ‘hybrid’ varieties develop.