Strength matters: Tie strength as a causal driver of networks’ information benefits

Studies of social networks have often taken the existence of a social tie as a proxy for the transmission of information. However, other studies of social networks in the labor market propose that the likelihood of information transmission might depend on strength of the tie; and that tie strength is a potentially important source of the tie's value. After all, even if job seekers have social ties to those who have valuable job information, the seekers will gain little information benefit when the ties do not actually transmit the information. This paper clarifies the conditions under which social ties might provide information benefits. We use a survey vignette experiment and ask MBA students about their likelihood of relaying job information via strong ties (to friends) or weak ties (to acquaintances), holding constant the structural locations spanned by the tie and job seekers' fit with the job. The results support the claim that strength of tie has a causal effect on the chances of information transmission: potential referrers are more likely to relay job information to their friends than to acquaintances. The larger implication of these findings is that whatever benefits there might be to using weak ties to reach distant non-redundant information during job search, these benefits need to be considered against the likely fact that people connected via weak ties are less likely to actually share information about job opportunities than are people to whom the job seeker is strongly tied.     

关于深化剩余价值理论的思考

劳动价值理论的深化必然会引发对剩余价值理论的深化。从马克思的分析方法出发 ,可以看出剩余价值也属于商品经济的一般范畴。从马克思的商品二因素原理出发 ,剩余产品的价值即可称为剩余价值。社会主义市场经济条件下应引入剩余价值范畴。剩余价值在不同的社会制度下 ,体现不同的经济关系。     

深度老龄化对我国劳动就业的潜在影响

对我国就业人口现状,2000-2010年城市、城镇、乡村人口就业速度,我国三大产业就业人口变化及人口年龄组劳动参与率变化的研究表明:若退休年龄不变,2030年我国潜在劳动力将比2010年减少14%;若男女退休年龄分别推迟5年,则2030年潜在劳动力仍将与2010年相当。然而,青年劳动力的比例下降快,农村尤其明显;2020年以后我国劳动力递减速度快,2040年我国60岁以上、65岁以上和80岁以上老年人口比例将超过28%、22%和4%。近20年我国经济发展很快,但面临老龄化的严重挑战,老龄化通过劳动力老化、社会保障、生产成本、商品出口、社会消费、货币汇率等途径,对经济持久地产生影响。     

What types of occupations are women entering? : Determinants of changes in female representation: 1970–2000

Although a consistent body of research has demonstrated that occupational segregation is highly consequential for women's economic standing, we know little about the processes that contribute to changes in levels of sex segregation. In this study, we examine those factors that contribute to changes in the percent of women in detailed occupational categories in the United States. Since we are most concerned with the economic consequences of this type of segregation, we analyze a group of high-paying, male-dominated occupations that, if better integrated, would contribute most to earnings equality. We find that occupations to which relatively high percentages of women aspired and occupations that are growing have been experiencing above-average increases in the percentage of women, while occupations characterized by male-stereotyped task profiles have been witnessing below-average increases. Additionally, our results suggest the presence of a ceiling effect: it is easier for women to break into male-dominated occupations initially than to sustain growth. Our analysis suggests that both supply and demand-side explanations provide insight into the processes contributing to increases in the occupations that we examine, although it can be very difficult to distinguish between supply and demand-side elements; indeed they may occur simultaneously.     

Does parents’ valuation of children’s health mimic their valuation of own health?

A single latent variable model of health status and therapeutic health care utilization is estimated for parents and own children of 6,557 US households. The equation system that identifies latent health status simultaneously determines a number of indicators of general health, including presence of morbidity symptoms, mobility limitations, medication needs, and utilization of therapeutic health care services. The main goal of the paper was to obtain an unbiased estimate of parents’ marginal substitution rate between own and child health. Results indicate that parents’ valuation of their children’s health exceeds their valuation of own health by almost twofold on average.

我国区际劳动力流动对经济增长的影响—就业结构变动效应的视角

改革开放以来,大量劳动力由中西部地区的农业部门流向东部沿海发达地区的非农部门,同步实现劳动力的乡城迁移和产业转移,这既是我国市场经济发展、二元经济结构转换的必然结果,也是支撑我国国民经济增长的一个重要机制。研究结果表明。80年代中期以来,随着我国区际劳动力流动日益活跃,劳动力就业结构效应对国民经济总量增长的贡献率呈加强趋势。消除限制区际劳动力流动的各种障碍,进一步增强我国区域问劳动力流动性,是促进国民经济持续快速发展的应时之举。     

中国第三条农村城镇化道路探索--基于劳动力供给视角

当前中国以异地化转移的城镇化模式已暴露出众多的问题,这种以人口非家庭式迁移和异地转移为主要特点的城镇化发展模式不可持续,必须予以改变。通过对中国第三条农村城镇化道路进行探索可知,以企业战略推动的统筹发展型就地城镇化模式能够弥补前两条道路的不足,可以实现整村、全家同步转移,农民到市民一步的转换,具有多元正效应。在就地转移的第三条道路中,个体的搜寻成本、心理成本、交通成本和住房成本明显低于第二条道路中相应的成本,而生活成本和学习成本则相差不大。将个体劳动供给经典模型进行扩展可知,当工作时间相同时,第三条道路的劳动者个体拥有较高的实际收入和效用水平;从家庭效用模型中也可发现,家庭部门愿意提供的就地转移劳动数量要多于异地转移劳动数量,其更倾向于第三条道路下的就地转移方式。     

Older workers’ employment in dynamic technology changes

Discrimination against older workers and the higher barriers for entrance to the workforce that these workers face are well documented in the literature. This situation becomes even worse when technological changes take place. In this paper the different responses of younger and older workers to those technological changes were analyzed, and it was revealed that older workers can be severely harmed when such changes occur. It was found that providing a subsidy for older workers could aid in reducing the unemployment among older workers, together with increasing growth of the economy and decreasing the inequality of income distribution.     

Les transformations actuelles du régime de l'innovation en Wallonie: une analyse des pôles de compétitivité

Notre contribution propose une grille d'analyse du régime wallon de l'innovation et des transformations dont il est l'objet. Nous mettons en évidence les dynamiques qui ont émergé en Wallonie entre les stakeholders de l'innovation et le régime existant, autour de la mise en place des pôles de compétitivité. L'originalité de notre article repose sur l'utilisation de concepts comme le “macro-récit” ou le “paysage socio-technique” pour interpréter les dynamiques d'une politique publique d'innovation et appréhender la complexité de l'univers discursif, institutionnel, historique, culturel, social et technologique des acteurs en présence. Notre analyse montre qu'une telle approche est nécessaire en complément à une évaluation d'impact traditionnelle pour mesurer les chances de succès de l'implémentation durable de la politique wallonne des pôles de compétitivité. Nous concluons que le modèle d'innovation qui transparait relève d'une appréhension systémique des modes de production de connaissance, mais reste cloisonné dans une logique instrumentale de l'innovation, insuffisante et peu réflexive, maintenant à distance la société et certains stakeholders de l'innovation.