Fundamental principles of network formation among preschool children

The goal of this research was to investigate the origins of social networks by examining the formation of children's peer relationships in 11 preschool classes throughout the school year. We investigated whether several fundamental processes of relationship formation were evident at this age, including reciprocity, popularity, and triadic closure effects. We expected these mechanisms to change in importance over time as the network crystallizes, allowing more complex structures to evolve from simpler ones in a process we refer to as structural cascading. We analyzed intensive longitudinal observational data of children's interactions using the SIENA actor-based model. We found evidence that reciprocity, popularity, and triadic closure all shaped the formation of preschool children's networks. The influence of reciprocity remained consistent, whereas popularity and triadic closure became increasingly important over the course of the school year. Interactions between age and endogenous network effects were non-significant, suggesting that these network formation processes were not moderated by age in this sample of young children. We discuss the implications of our longitudinal network approach and findings for the study of early network developmental processes.     

Multicultural awareness through English: a potential contribution of TESOL in Greek schools

The cultural diversity now evident in Greek society creates educational challenges and opportunities. Space to address these is provided by the multicultural awareness aspects of the discourse of the Cross‐Thematic Curriculum Framework (CTCF). For English language classes, multicultural direction is provided through the disciplinary discussion of new teaching paradigm possibilities. In particular, these discussions encourage us to explore the repositioning of English teaching in Greek state schooling from a foreign language orientation towards a multicultural one. In this article, having set the context, we present the Multicultural Awareness Through English (MATE) paradigm. We conclude by illustrating the MATE paradigm in action.

     

Configurations of informal social support among older lesbians

Limited research has been conducted on the needs and concerns of older lesbians in the American population. The purpose of this paper is to present findings from a qualitative study of older (aged 55 and older) lesbians' experiences of and perspectives on aging, with a focus on their discussions of social support. Through an in-depth qualitative study with 25 older lesbians, we found that aging lesbians may be less likely to access formal social services due to perceptions of bias within the services and a potential lack of connection with those who do use services. However, participants were creative at formulating informal networks of support. Four heuristic categories (empowered, secure, independent, and precarious) of informal social support were developed to characterize the various ways in which participants configured their support systems. Social support within each category was conceptualized both in terms of intentionality and degree of connectedness. Being partnered did not necessarily equate with a strong sense of social support. Further research needs to be conducted on older lesbians in order to better characterize and respond to their needs as they age.     

Unaffiliated voters

According to the conventional wisdom, political parties are hurt by unaffiliated voters (those who are not registered as Democrats or Republicans). These independents are irresponsible and unpredictable. Recent election law reforms throughout the country have encouraged affiliation by restricting voting in a primary to party members. This study examines the effect of the closed primary system in Connecticut. Research found that since the advent of the primary, the proportion of voters registered as unaffiliated has undergone a steady decline. But the decline in the proportion unaffiliated, however, does not appear to have strengthened partisan commitments. Rather it has changed the meaning of unaffiliated registration. In the past unaffiliated voters tended to be Democrats. Today they are equally likely to be either party.     

Gender and self-employment selection: An empirical assessment

This paper presents a unique assessment of the factors that influence men's and women's decisions to switch from wage employment to self-employment; virtually all studies of self-employment entry have heretofore focussed solely upon men. Using longitudinally matched data from the Current Population Survey, novel empirical patterns adduced here include: (1) the relatively strong, positive influence of fertility upon women's selection into self-employment; (2) the greater propensity of small business employees to switch to self-employment; and (3) the significant relationship between wage-sector occupation and predisposition to self-employment.     

Network governance in the heritage ecology

This article examines an AHRC ‘Co-Design and Co-Production’ project focussed on the decision-making processes within the ‘heritage ecology’. The project involved three UK universities and a range of heritage institutions and community organisations. The project set out to empower community organisations through an emphasis upon deliberative democracy. Heritage is conceptualised as public value because it is used to define identity and belonging in civil society. Network governance theory is used to characterise the operational capabilities and the decision-making environment in the heritage ecology. The article argues that the public value of heritage is realised through network governance when ‘human elements’, such as emotional value are authentically and legitimately represented in deliberative processes.     

Private versus public old-age security

We directly compare two institutions, a family compact—a parent makes a transfer to her parent in anticipation of a possible future gift from her children—with a pay-as-you-go, public pension system, in a life cycle model with endogenous fertility wherein children are valued both as consumption and investment goods. Absent intragenerational heterogeneity, we show that a benevolent government has no welfare justification for introducing public pensions alongside thriving family compacts since the former is associated with inefficiently low fertility. This result hinges critically on a fiscal externality—the inability of middle age agents to internalize the impact of their fertility decisions on old-age transfers under a public pension system. With homogeneous agents, a strong-enough negative aggregate shock to middle-age incomes destroys all family compacts, and in such a setting, an optimal public pension system cannot enter. This suggests the raison d’être for social security must lie outside of its function as a pension system—specifically its redistributive function which emerges with heterogeneous agents. In a simple modification of our benchmark model—one that allows for idiosyncratic frictions to compact formation such as differences in infertility/mating status—a welfare-enhancing role for a public pension system emerges; such systems may flourish even when family compacts cannot.     

不同决策目标下受资金约束零售商的最优采购策略研究

在提前订购和延时采购两种情景下,分别考虑最大化期望收益和最小化违约概率两种决策目标,对受资金约束零售商的最优采购量和相匹配的融资策略进行分析,结果表明,相比于以最大化期望收益为决策目标,以最小化违约概率为决策目标的零售商在提前订购中将奉行"保守"的采购量和融资策略（仅耗尽自有资金量采购而不融资）,而在延时采购中采取"激进"的采购量和融资策略（与最大化期望收益下一致）;在此基础上,对不同决策目标下受资金约束零售商的最优采购时机问题进行研究发现,在最大化期望收益下,零售商的最优采购时机由产品采购成本、市场容量均值、市场容量方差、自有资金量、银行贷款利率等多个参数共同决定,而在最小化违约概率下,零售商将始终选择延时采购。