Legalization and human capital accumulation

This paper presents new evidence regarding the effects of legalization on the training of immigrants who were granted legal status through the US Immigration Reform and Control Act (IRCA) of 1986. Our findings point to a large increase in the immigrants’ incidence of training relative to comparable groups of natives following legalization. While training gains are higher for males, wage gains are higher for females. We also show that an important part of these changes in labor market outcomes occurs through occupation changes by newly legalized immigrants.     

YOUTUBE,TWITTER AND THE OCCUPY MOVEMENT

Videos stored on YouTube served as a valuable set of communicative resources for publics interested in the Occupy movement. This article explores this loosely bound media ecology, focusing on how and what types of video content are shared and circulated across both YouTube and Twitter. Developing a novel data-collection methodology, a population of videos posted to YouTube with Occupy-related metadata or circulated on Twitter alongside Occupy-related keywords during the month of November 2011 was assembled. In addition to harvesting metadata related to view count and video ratings on YouTube and the number of times a video was tweeted, a probability sample of 1100 videos was hand coded, with an emphasis on classifying video genre and type, borrowed sources of content, and production quality. The novelty of the data set and the techniques adapted for analysing it allow one to take an important step beyond cataloging Occupy-related videos to examine whether and how videos are circulated on Twitter. A variety of practices were uncovered that link YouTube and Twitter together, including sharing cell phone footage as eyewitness accounts of protest (and police) activity, digging up news footage or movie clips posted months and sometimes years before the movement began; and the sharing of music videos and other entertainment content in the interest of promoting solidarity or sociability among publics created through shared hashtags. This study demonstrates both the need for, and challenge of, conducting social media research that accommodates data from multiple platforms.     

地中海区域邮轮港口发展研究

地中海区域具有发展邮轮旅游业的多重优势。区域内的众多港口为吸引邮轮公司,获取更大发展而激烈竞争。然而调研的案例表明,这些港口并未因激烈竞争而几败俱伤,反而形成你追我赶、共同发展的良好局面,地中海区域的邮轮旅游业也由此得到持续提升。进入大众旅游时代的中国,邮轮旅游作为一种新的旅游形式正被中国旅游者接受。中国港口所在地政府若能借鉴地中海区域邮轮港口群的经验,类似地中海区域邮轮港口群良性发展的局面也可在中国沿海出现。     

Relationship between sarcopenia and fracture risks in obese postmenopausal women

It is known that obesity is inversely correlated with fracture risk. It remains unclear if a low muscle mass (sarcopenia) modulates the relationship between obesity and bone mass density. Twenty-seven obese women were matched for total fat mass (+/- 0.5 kg) and age (+/- 4 yrs) and divided in 3 equal groups: class II sarcopenic, class I sarcopenic, and nonsarcopenic. Body composition (DXA) and dietary intake were measured. Our results suggest that obesity may offer some protection against osteoporosis, even in sarcopenic postmenopausal women. However, further studies are needed to examine the actual implication of these results on a clinical standpoint.     

First Exits from the Swedish Labor Market Due to Disability

Nowadays, with an increasingly aging population, an increasing proportion of the population on disability benefits, and an implicitly lower level of economic output and foregone tax revenue, disability has become a major public policy issue in many countries. Estimating both single risk and competing risks models on a Swedish longitudinal database, this study analyzes the risk of exit from the labor market due to disability at a certain age, conditional on having remained in the labor force until that age. The explanatory variables did not have identical coefficients across destination types. For example, the estimated single risk model shows that a higher level of education decreased the hazard of exiting the labor market with a disability pension, while the estimated competing risks model suggests that a higher level of education increased the hazard of exiting with a partial disability pension, but it decreased the hazard of exiting with a full disability pension.

Nonparametric estimation of transition probabilities in a non-Markov illness–death model

In this paper we consider nonparametric estimation of transition probabilities for multi-state models. Specifically, we focus on the illness-death or disability model. The main novelty of the proposed estimators is that they do not rely on the Markov assumption, typically assumed to hold in a multi-state model. We investigate the asymptotic properties of the introduced estimators, such as their consistency and their convergence to a normal law. Simulations demonstrate that the new estimators may outperform Aalen–Johansen estimators (the classical nonparametric tool for estimating the transition probabilities) in non-Markov situation. An illustration through real data analysis is included.     

Pareto improving transition from a pay-as-you-go to a fully funded pension system in a model of endogenous growth

In this paper we investigate the possibility of Pareto improving social security reforms within a framework of endogenous growth. Belan et al. (1998) propose a transition from a pay-as-you-go (PAYG) pension system to a system of savings–subsidization. We follow this approach and prove that a Pareto improving conversion from the PAYG system to a fully funded one is possible. Finally, we compare the subsidy system with the fully funded system and discuss the problem of implementing the transition to the fully funded system. Received: 07 March 1999/Accepted: 13 December 1999