Why Skew Selection, a Model of Parental Exploitation, Should Replace Kin Selection

Synopsis In his 1964 paper, William Hamilton wrote that inclusive fitness trumps direct fitness if, and only if, the effect of interactions among siblings on their parent’s fitness is ‘zero’. Kin selection models have succeeded only because they have ignored the fact that, if an altruist dies saving two siblings, the ‘zero impact on their parent’s fitness’ constraint is violated. Imagine a parent with three offspring. If two offspring drown, parental fitness is 1. On the other hand, if one altruistic offspring dies saving its two drowning siblings, parental fitness doubles to 2. Thus, direct fitness trumps inclusive fitness as an explanation for the evolution of altruism. In other words, parents that produce some portion of altruistic offspring willing to die to save some of their siblings (who would die without the intervention of the altruist) will realize greater fitness than parents producing no altruists. Skew selection, a bioeconomic extension of Michael Ghiselin’s (1974) parental exploitation model, is presented to explain the evolution of altruism from a direct fitness point of view.     

Effect of Parental Migration on the Academic Performance of Left‐behind Middle School Students in Rural China

China's rapid development and urbanization over the past 30 years have caused large numbers of rural residents to migrate to urban areas in search of work. This has created a generation of children who remain behind in rural areas when their parents migrate for work. Previous research has found mixed impacts of parental migration on the educational achievement of left‐behind children (LBC), perhaps because of methodological deficiencies and lack of recognition of the heterogeneity of this population of children. Our study attempts to examine the impact of six types of parental migration on the academic achievement of a rural junior high school sample. Our study uses a panel of 7148 junior high school students to implement a difference‐in‐difference analysis and finds that parental migration has a negative and significant impact on the academic achievement of junior high school students. Our study suggests that the Chinese Government should implement measures to dismantle barriers to the human capital accumulation of LBC to ensure sustainable economic growth and human capital development in China.     

How does the availability and use of flexible leave influence the employer–employee relationship?

In this article, we develop, and empirically test, a moderated mediation model of the effects of flexible leave on employees' organizational attachment. Drawing on a social exchange framework and signaling theory, we explore how the material and non-material nature of exchange between the employer and employee shapes their relationship. First, we show that the relationship between the availability of flexible leave and organizational attachment is shaped by two competing mediators, perceived organizational support (POS) and perceived flexibility stigma. Second, we delineate between availability and use of the policy, to show how the effect of POS is enhanced and perceived flexibility stigma reduced, with use. Our findings demonstrate that the relationship between the availability of flexible leave and organizational attachment is complex, but is enhanced through use of flexible leave. We contribute toward HRM scholarship about the relationship between employees' experience of HR practices and their corresponding impact on employees' subsequent behavior.     

Balancing the risk of ‘Lazearian’ interrupters and the benefits of educational and social peers: tracing parental preferences for class-size reduction

Using Danish survey data from a choice experiment, parental preferences for class-size reduction are estimated. While parents with children in large classes are willing to pay for class-size reduction, parents with children in small classes are reluctant and even express negative utility for further class-size reduction. We interpret this as parents balancing the risk of ‘Lazearian’ interrupters and the benefits of educational and social peers when forming their preferences for class size.     

我国城镇已婚妇女照料父母与自评健康的关系研究

我国老年人以非正式照料为主,妇女承担了主要的照料责任。政府减少对非正式老年照料的支持以及老年人口的快速增长将会加重家庭中女性的照料负担。利用1997、2000、2004和2006年中国营养与健康调查(CHNS)数据和Ordered Probit模型来研究城镇已婚妇女照料父母及其自评健康的关系。在我国城镇,与不照料父母相比,照料父母的已婚妇女更倾向于报告较差的健康水平,并且"自评健康状况非常好"的概率减小,而"自评健康状况一般"的概率增大。应该关注日益繁重的照料责任,以及工作与家庭照料之间的激烈竞争可能给妇女的心理、身体和社会福利带来的负面影响。     

Employees intent to leave: A comparison of determinants of intent to leave versus intent to stay

The purpose of the study is to examine whether the predictors that decrease employee intention to leave will also increase employees’ intention to stay. Therefore, the objective of the study is twofold: (1) to examine the influence of perceived organizational support, perceived supervisors’ support, and organizational commitment regarding intent to leave and (2) to investigate the influence of the same variables on intent to stay. A total of 416 hospitality employees in the U.S. participated. The results suggest that perceived organizational support and organizational commitment decreased intent to leave while only perceived organizational support had a positive impact on intention to stay. Implications detail ways that hospitality organizations can focus on increasing their employees’ commitment through perceived organizational support as a critical component of turnover culture.     

人格障碍研究与童年期经历相关研究综述

人格障碍是近年来心理学界的研究热点,人格障碍与童年期经历的关系是主要的研究取向之一,通过概括人格障碍的定义和分类方法,总结了主要测量工具,综述了人格障碍与父母教养方式、依恋、虐待的相关研究等文献资料,在此基础上对人格障碍与童年期经历相关研究进行总结和展望。     

Price of High‐quality Daycare and Female Employment

Using local variation between municipalities, I analyze the degree to which the price of high‐quality publicly subsidized childcare affects female employment following maternity leave. Importantly, prices are income dependent and thus likely endogenous, yet by exploiting information on minimum income compensation during non‐employment, I bypass this problem. The results show that the price negatively affects employment. A price increase of €1 per month decreases employment by 0.08%, which corresponds to a price elasticity of −0.17. These effects prevail during the first 12 months after childbirth. I also find that availability of childcare increases employment.