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This chapter seeks to shed light on the many factors that contribute to people becoming school shooters. These factors are divided into four domains: biological, psychological, social, and cultural. At the biological level, this chapter explores the potential influence of genetics, pre- and post-natal development, and body-related issues that may affect the perpetrators' sense of self. A psychological typology is presented, consisting of psychopathic, psychotic, and traumatized school shooters. Socially, school shooters often have multiple setbacks, failures, and rejections that contribute to their distress. Finally, the cultural domain includes such factors as media violence, role models for killing, and ideologies of hatred and supremacy. Rather than attributing school shootings to a simplistic cause such as bullying, this chapter discusses a wide range of potential influences that combine to cause mass attacks at schools.

The objective of this study was to determine whether an association between coparenting trajectories and parental commitment exists five years after the birth of focal children. Situated in commitment theory, the study used data from the Fragile Families and Child Wellbeing Study to estimate latent growth curve models to test the relationship between coparenting trajectories and commitment theory. Results show that the coparenting trajectory decreased over the four-year period, but reports remained high. Mothers who report high levels of coparenting also report being committed to the biological father, albeit commitment is low. This finding shows that parents may be dedicated to their children and constrained by the parental dyad. These findings support the hypothesis that children are constraining the parental dyad. Further, coparenting among unmarried, cohabiting parents influence parental relationships over time–substantiating the argument that a “new package deal” exists.

Social implications – If parents feel constrained to each other due to shared children, policies directed at coparenting, rather than marriage incentives and promotion, could help parents learn to negotiate their parental duties with each other to ensure that both parents are vested in their children’s lives.

Recent U.S. Treasury yields have been constrained to some extent by the zero lower bound (ZLB) on nominal interest rates. Therefore, we compare the performance of a standard affine Gaussian dynamic term structure model (DTSM), which ignores the ZLB, to a shadow-rate DTSM, which respects the ZLB. Near the ZLB, we find notable declines in the forecast accuracy of the standard model, while the shadow-rate model forecasts well. However, 10-year yield term premiums are broadly similar across the two models. Finally, in applying the shadow-rate model, we find no gain from estimating a slightly positive lower bound on U.S. yields.