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Abstract: Researchers have established that individual religiosity influences sexual behavior and that religious support can increase consistency between personal religiosity and behavior. Researchers are less certain, however, of the effect that religious friendship networks have on sexual behavior. In addition, the effects of network characteristics such as density and one’s position in a social network have not been established. This paper uses a network subsample of the National Longitudinal Study of Adolescent Health (Add Health) to examine the effect of friends’ religiosity on the probability of first sex. We find that friends’ religiosity has an independent influence on adolescent sexual behavior that is similar in magnitude to personal religiosity. We also find evidence that friends’ religiosity has the strongest influence on the sexual behavior of adolescents who are embedded in dense social networks, in which teens’ friends are also friends with one another. These results support the hypothesis that group influences depend on the degree of embeddedness within the network and highlight the importance of studying religion as a property of groups as well as individuals. [Copyright &y& Elsevier]

Corporate innovation is often argued to result from, and be encouraged by, market competition. The tradition is to test such arguments with market concentration data; firms with stronger control over their market can afford the long-run investment of R&D. Network theory has broadened our understanding of how competition is a function of structure within and beyond a market. Producers earn high profit margins to the extent they are few and their customers and suppliers are many and disorganized. The first condition is measured by the traditional concentration ratio for a market. The second condition is measured by the network constraint of suppliers and customers. My purpose in this paper is to describe how our understanding of the market competition effect on innovation is enriched when the concentration measure of market competition tradition in economics is replaced with the network model of market competition now prevalent in sociology. Results indicate that markets facing competitive environments, in high constraint market positions, show greater R&D intensity and faster rates of innovation than do industries facing less competitive pressure. These effects persist even with controls for technological opportunity and appropriability, in contrast to traditional models using only concentration data to measure competition. [ABSTRACT FROM AUTHOR]