Social network externalities and price dispersion in online markets.

Ample empirical studies in the e-commerce literature have documented that the price dispersion in online markets is 1) as large as that in offline markets, 2) persistent across time, and 3) only partially explained by observed eretailers’ attributes. Buying on the internet market is risky to consumers. First of all, consumers and the products they purchase are separated in time. There is a delay in time between the time consumers pay and the time they receive the orders. Second, consumers and the products they purchase are separated in space. Consumers cannot physically touch or examine the products at the point of purchase. As such, online markets involve an adoption process based on the interaction of consumers’ experiences in the form of references, recommendations, word of mouth, etc. The social network externalities introduced by the interaction of consumer’s experiences reduces the risk of seller choice and allows some sellers to charge higher prices for even homogeneous products. This research aims to study online market price dispersion from the social network externalities perspective. Our model posits that consumers are risk averse and assess the risk of having a satisfactory transaction from a seller based on the two dimensions of the seller’s social network externalities: quantity externality (i.e., the size of the seller’s social network) and quality externality (i.e., the satisfactory transaction probability of the seller’s social network). We further investigate the moderating effect of product value for consumers on the impact of social network externality on online market price dispersion. Our model yields several important propositions which we empirically test using data sets collected from eBay. We found that 1) both quantity externality and quality externality of social network are salient in driving online price dispersion, and 2) the salience of social network externality is stronger for purchase behavior in higher value product categories.network externalities, price dispersion, online markets, word of mouth

Global epidemiology: proceedings of the third TEPHINET conference -- Beijing, China, November 8-12, 2004

Investigation of Avian Influenza (H5N1) Outbreak in Humans--Thailand, 2004 / Darin Areechokchai, C. Jiraphongsa, Y. Laosiritaworn, W. Hanshaoworakul, M. O'Reilly -- Occupational Injuries Among Workers in the Cleansing Section of the City Council's Health Services Department--Bulawayo, Zimbabwe, 2001-2002 / Elizabeth Gonese, R. Matchaba-Hove, G. Chirimumba, Z. Hwalima, J. Chirenda, M. Tshimanga -- Progress Toward Tuberculosis Control and Determinants of Treatment Outcomes--Kazakhstan, 2000-2002 / Ekaterina Bumburidi, S. Ajeilat, A. Dadu, I. Aitmagambetova, J. Ershova, R. Fagan, M.O. Favorov -- Estimation of Measles Vaccination Coverage Using the Lot Quality Assurance Sampling (LQAS) Method--Tamilnadu, India, 2002-2003 / Saravanan Sivasankaran, P. Manickam, R. Ramakrishnan, Y. Hutin, M.D. Gupte -- Bacterial Meningitis Among Cochlear Implant Recipients--Canada, 2002 / Samantha D. Wilson-Clark, S. Squires, S. Deeks -- Risk Factors for Neonatal Tetanus--Busoga Region, Uganda, 2002-2003 / Sheba N. Gitta, F. Wabwire-Mangen, D. Kitimbo, G. Pariyo -- Risk Factors for Brucellosis--Leylek and Kadamjay Districts, Batken Oblast, Kyrgyzstan, January-November, 2003 / Turatbek B. Kozukeev, S. Ajeilat, E. Maes, M. Favorov -- Salmonellosis Outbreak Among Factory Workers--Huizhou, Guangdong Province, China, July 2004 / Lunguang Liu, H.F. He, C.F. Dai, L.H. Liang, T.Li, L.H. Li, H.M. Luo, R. Fontaine -- Varicella Outbreak Among Primary School Students--Beijing, China, 2004 / Huilai Ma, R. Fontaine"... in 1999, the Training Programs in Epidemiology and Public Health Interventions Network (TEPHINET) was formed. TEPHINET is dedicated to strengthening international public health capacity by enhancing competencies in applied epidemiology and public health practice.... This supplement to the MMWR highlights the work of epidemiologists who have graduated from TEPHINET member programs. The articles were developed from abstracts presented in Beijing, China, at the Third Global Scientific Conference of TEPHINET during November 8-12, 2004." - p.1Includes bibliographical references

Precarization, Genderization and Neotaylorist Work: How Global Value Chain Restructuring Affects Banking Sector Workers in Brazil

The transnationalization of financial markets impacted on the fragmentation and recomposition of value chains which induced comprehensive processes of outsourcing and the commodification of bank services. This paper explores how this translates into the sectoral and internal reorganization of Brazilian banks and how work organization and social relations are affected. The case of (bank-owned as well as outsourced) call center not only reflects changes in the importance and form of service relations but also shapes a neotayorist reorganization of the labor process and the respective modes of control. As a result, a complex process of precarization and segmentation of the work force can be observed which impacts on new lines of inequality related to categories like gender, class and race. The analysis is based on a theoretical approach which refers to Michael Burawoy’s concept of the “politics of production” and categories of Pierre Bourdieu’s social theory like symbolic violence. This allows an analysis of power relations which also includes the dimension of identities. Thus a more fine-grained insight can be gained on how transnational restructuring affects redistribution on a macro, meso and micro level

Manila Resolution: strengthening partnerships to advance the science of fish breeding and genetics and development of national fish breeding programs

An agreement on the need for concerted international efforts for advancing the science of fish breeding and genetics through networking.Fish culture, Genetics, International cooperation

Development of agricultural market and trade policies in the CEE Candidate Countries

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Network of landscapes in the sustainable management of transboundary biosphere reserves

Producción CientíficaThe creation of Transboundary Biosphere Reserves (TBRs) is one of the most outstanding contributions of the United Nations Educational, Scientific, and Cultural Organization (UNESCO) Man and Biosphere Programme (MAB). Recent revisions have shown that there is a gap between its biodiversity conservation proposals and the theoretical convergence of nations towards sustainable development goals with the practices in action. By applying the landscape approach to the case study of the rural system of the Spanish–Portuguese border, declared Meseta Ibérica TBR (MITBR), it is verified that the spatial zoning of TBRs is a prominent factor in this gap, since they do not correspond to the landscape units and bioregions. This has led to the formulation and implementation of strategic proposals for the reorientation of TBRs towards the stimulation of landscape networks in the transboundary framework. Agroecological networks in this territory stand out, which brings together one of the highest concentrations of indigenous breeds in Europe. A breeder replacement experience was carried out based on the social networks of the MITBR that protect the landscape. The main conclusion of this article is that TBRs are effective in practice through the promotion of cross-border networks of governance and social participation, and mainly through agroecological ones due to their outstanding effect on biodiversity.Interreg POCTEP ( grant 0421_PAISAJE_IBERICO_2_E)Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020 (PGC2018-097135-B-I00; MCIU/AEI/ERDF-UE

Soweto Day Rally

A flyer for the Soweto Day 1989 Rally in Chicago, Illinois following the walkathon.https://digitalcommons.colum.edu/soweto/1005/thumbnail.jp

On Link Estimation in Dense RPL Deployments

The Internet of Things vision foresees billions of devices to connect the physical world to the digital world. Sensing applications such as structural health monitoring, surveillance or smart buildings employ multi-hop wireless networks with high density to attain sufficient area coverage. Such applications need networking stacks and routing protocols that can scale with network size and density while remaining energy-efficient and lightweight. To this end, the IETF RoLL working group has designed the IPv6 Routing Protocol for Low-Power and Lossy Networks (RPL). This paper discusses the problems of link quality estimation and neighbor management policies when it comes to handling high densities. We implement and evaluate different neighbor management policies and link probing techniques in Contiki’s RPL implementation. We report on our experience with a 100-node testbed with average 40-degree density. We show the sensitivity of high density routing with respect to cache sizes and routing metric initialization. Finally, we devise guidelines for design and implementation of density-scalable routing protocols