Corporate competition: A self-organized network

A substantial number of studies have extended the work on universal properties in physical systems to complex networks in social, biological, and technological systems. In this paper, we present a complex networks perspective on interfirm organizational networks by mapping, analyzing and modeling the spatial structure of a large interfirm competition network across a variety of sectors and industries within the United States. We propose two micro-dynamic models that are able to reproduce empirically observed characteristics of competition networks as a natural outcome of a minimal set of general mechanisms governing the formation of competition networks. Both models, which utilize different approaches yet apply common principles to network formation give comparable results. There is an asymmetry between companies that are considered competitors, and companies that consider others as their competitors. All companies only consider a small number of other companies as competitors; however, there are a few companies that are considered as competitors by many others. Geographically, the density of corporate headquarters strongly correlates with local population density, and the probability two firms are competitors declines with geographic distance. We construct these properties by growing a corporate network with competitive links using random incorporations modulated by population density and geographic distance. Our new analysis, methodology and empirical results are relevant to various phenomena of social and market behavior, and have implications to research fields such as economic geography, economic sociology, and regional economic development.     

Consumer Heterogeneity and Paid Search Effectiveness: A Large‐Scale Field Experiment

Internet advertising has been the fastest growing advertising channel in recent years, with paid search ads comprising the bulk of this revenue. We present results from a series of large‐scale field experiments done at eBay that were designed to measure the causal effectiveness of paid search ads. Because search clicks and purchase intent are correlated, we show that returns from paid search are a fraction of non‐experimental estimates. As an extreme case, we show that brand keyword ads have no measurable short‐term benefits. For non‐brand keywords, we find that new and infrequent users are positively influenced by ads but that more frequent users whose purchasing behavior is not influenced by ads account for most of the advertising expenses, resulting in average returns that are negative.     

Book Review Developmental Theories of Crime and Delinquency,Series: Advances in Criminological Theory,Terence P. Thornberry,ed. New Brunswick,NJ, Transaction, 1996, 359 pp., $44.95, ISBN 1560001992

Sociological Practice -     

Developing a More Inclusive Social Identity: An Elementary School Intervention

School integration, stimulated by the 1954 Brown v. Board of Education decision, has influenced students' social and educational experiences. Drawing on practice and theory, we focus on strategies for improving intergroup relations. In a series of sessions over four-weeks, 830 first and second grade children participated in Green Circle program activities designed to widen their circles of inclusion to include people who are different from themselves. Although the intervention did not influence children's biases in sharing or how happy they would be playing with others who were different from themselves based on race, sex, and weight, it did lead them to be more inclusive in selecting their most preferred playmate. Implications for friendship development and improvement in intergroup attitudes are considered .

He drew a circle that shut me out- Heretic, rebel, a thing to flout. But love and I had the wit to win- We drew a circle that took him in.
                              —Edwin Markham (1936, p. 67)

     

Effects of Unemployment on Health in a Community Survey: Main, Modifying, and Mediating Effects

Results from a community survey in a sample of high-unemployment census tracts in southeastern Michigan showed significant elevations of depression, anxiety, somatization, and self-reported physical illness among the currently unemployed. These adverse effects were largely reversed by reemployment. Subsequent analyses documented modifying effects of social support, self-concept, and coping. We also found two mediating processes that account for the overall effects of current unemployment: (a) the intervening effects of financial strain, and (b) an influence of unemployment in creating heightened vulnerability to other stressful life events. The implications of these results for the design and implementation of preventive interventions are briefly discussed.     

PREDICTING MORTALITY AMONG INDEPENDENTLY LIVING RURAL ELDERLY:

The problem of predicting mortality among rural elderly (65 years and older) living independently is examined using 20-year panel data derived from a random multistage cluster sample. Fifteen independent variables, including social networks, age, sex, and health status, were hypothesized on theoretical and empirical grounds to predict mortality. Face-to-face structured interviews were conducted with the same respondents in 1966, 1974, and 1986/87. Logistic regression establishes that a model comprising age, sex, participation in formal organizations, relative and children association, and general health status is a powerful predictor of mortality. The authors conclude that the more heterogeneous formal, or secondary, social networks which may enhance self esteem are most functional for the elderly.     

Exotic Enterprise No More? Adolescent Reports of Family and Parenting Processes From Youth in Four Countries

The current investigation cross‐nationally examined the relationship between adolescent reports of family or parenting processes and a series of developmental outcomes in a sample of adolescents (N=8,417) from Hungary, the Netherlands, Switzerland, and the United States. Based on confirmatory factor analyses and tests of scalar equivalence, results suggest that the Adolescent Family Process Measure (AFP), which assesses maternal and paternal closeness, support, monitoring, communication, conflict, and peer approval, was valid and reliable for males, females, middle adolescents, and late adolescents in all four national contexts. In addition, based on model‐free LISREL analyses, findings suggested that the relationships between these family processes and measures of adolescent externalizing (alcohol use, drug use, school misconduct, and total deviance) and internalizing (anxiety, depression, low self‐esteem, and low well‐being) behaviors were similar cross‐nationally. Findings are discussed in terms of their importance for the conceptualization and measurement of family and parenting processes.     

Focused,Exploratory, or Vigilant: Reproduction,Mobility, and the Self-Narratives of Second-Generation Immigrant Youth

Qualitative Sociology - The transition from late adolescence to early adulthood represents a key moment in trajectories of social reproduction and mobility. A central mechanism influencing these...