Aging, fertility, social security and political equilibrium

We analyze the effect of population aging on the political choice of the size of a pay-as-you-go (PAYG) social security system, incorporating the heterogeneity of individuals in their preference for having children, and hence the endogenous fertility choices of individuals, into a simple overlapping generations model. We show that population aging may result in an increase in the contribution rate, increasing the share of the retired population who prefer a higher contribution rate; and that, if the system involves redistribution between retirees with different contributions, the increased contribution rate raises the number of individuals who have children, i.e., future contributors.     

中国追诉时效制度的背景——从古代中国法的观点

追诉时效制度是指犯罪发生后,经过法定期限不提起公诉,求刑权即归于消灭的制度。在中国,这一制度通常被认为是一个"舶来品"。然而,古代世界各国均普遍存在追诉时效制度。所以要解密"为什么在古代中国没有出现"。虽然古代中国没有明确的追诉时效制度,但已显示出相似的思想。对古代中国没有出现追诉时效制度的原因进行了分析,并指出现行中国的追诉时效制度实际继承了古代中国法的思想。     

Two Components of Wage Gaps Induced by Individual-level Variables: Intra-firm or Inter-firm?

Individual-level variables such as gender, education, occupation, and employment type are well-known factors that induce wage gaps in the labor market. This article aims to divide wage gaps into two components—those arising within each firm (the intra-firm wage gap) and those arising between different firms (the inter-firm wage gap)—and measure their respective proportions by individual-level variables, as studies suggest that each wage gap based on an individual-level variable has a unique mix of an intra-firm and inter-firm wage gap. This measurement can help enrich investigation into the generative process of wage gaps and formulate effective labor policies to reduce them. Accordingly, we compared the coefficients of the independent variables of the wage function estimated by a pooled ordinary least squares model and a fixed-effect model, using nationwide employer–employee matching data collected by the Japanese government. We found that wage gaps by gender and employment type mostly consist of intra-firm wage gaps, and those by education and occupation have a larger share of inter-firm wage gaps. The findings suggest that different research strategies are required to investigate the generative process of each wage gap, and that regulations on and interventions in organizational processes are important to reduce wage gaps based on gender and employment type.     

The correlation between highly sensitive C-reactive protein levels and erectile function among men with late-onset hypogonadism

We investigated the correlation between highly sensitive C-reactive protein (hs-CRP) levels and erectile function, and assessed the clinical role of hs-CRP levels in men with late-onset hypogonadism (LOH) syndrome. For 77 participants, we assessed Sexual Health Inventory for men (SHIM) score, Aging Male Symptoms (AMS) score and International Prostate Symptom Score (IPSS). We also evaluated free testosterone (FT), hs-CRP, total cholesterol, triglyceride levels, high density lipoprotein cholesterol, hemoglobin A1c, body mass index, waist size and blood pressure. We attempted to identify parameters correlated with SHIM score and to determine the factors affecting cardiovascular risk based on hs-CRP levels. A Spearman rank correlation test revealed that age, AMS score, IPSS and hs-CRP levels were significantly correlated with SHIM score. Age-adjusted analysis revealed that hs-CRP and IPSS were the independent factors affecting SHIM score (r=??0.304 and ?0.322, respectively). Seventeen patients belonged to the moderate to high risk group for cardiovascular disease, whereas the remaining 60 belonged to the low risk group. Age, FT value and SHIM score showed significant differences between the two groups. A multivariate regression analysis demonstrated that SHIM score was an independent factor affecting cardiovascular risk (OR: 0.796; 95%CI: 0.637–0.995).     

Effects of dutasteride on lower urinary tract symptoms: a prospective analysis based on changes in testosterone/dihydrotestosterone levels and total prostatic volume reduction

This study analyzed the effects of dutasteride on lower urinary tract symptoms based on the association between changes in the total testosterone (TT)/dihydrotestosterone (DHT) levels and total prostate volume (TPV) reduction. Sixty participants diagnosed with benign prostatic hyperplasia were given 0.5?mg of dutasteride daily for 52 weeks. Measures of TT and DHT levels, TPV and uroflowmetry were obtained before and after dutasteride treatment. Forty-three patients demonstrated a TPV reduction of ≥5% (Group 1), whereas the remaining 17 patients demonstrated a TPV reduction of <5% (Group 2). DHT suppression and DHT/TT ratio at baseline were significantly higher in Group 1 than Group 2. International Prostate Symptom Scores (IPSS) and uroflowmetry were significantly improved in both groups. In Group 2, nine patients demonstrated some improvement in IPSS (Group 2A), whereas eight did not (Group 2B). The rate of TT increase and improvement in voiding symptoms were significantly higher in Group 2A than Group 2B. Dutasteride-induced TPV reduction is dependent on individual 5-α reductase inhibitor activity. Some patients demonstrating smaller dutasteride-induced TPV reduction may experience an improvement in voiding symptoms owing to an increased level of testosterone.     

Correction to: Redistribution to the less productive: parallel characterizations of the egalitarian Shapley and consensus values

Theory and Decision - In sub-Sect.&nbsp;3.3, the terms “one-person” and “(n-1)-person” were incorrectly updated by mistake during the correction stage in the online...     

Same‐Race Friendships and School Attachment: Demonstrating the Interaction Between Personal Network and School Composition1

Previous research has demonstrated that students are strongly attached to school when many same‐race peers are present. This study extends the literature by considering students’ immediate social environment at school—egocentric friendship networks. I hypothesized that same‐race friendships contribute to school attachment by increasing the amount of support that students receive for their racial backgrounds in direct interactions. Further, the association between same‐race friendships and school attachment should be stronger when the school includes many same‐race peers because the organizational condition increases the ability of same‐race friendships to connect students to the major components of school‐wide networks and reduces perceived racial contrast between friends and nonfriend peers. Statistical analysis of the National Longitudinal Study of Adolescent Health (Add Health) provided some support for these hypotheses, but white, black, Hispanic, and Asian students showed somewhat different patterns, suggesting group differences in how students develop and view same‐race friendships. The study highlights the importance of individual agency in navigating the multileveled social environment as well as the ability of organizational contexts to shift emotional consequences of personal relationships.