社会网络层次与农民工工资水平——基于身份定位模型的分析

本文在身份定位模型框架下研究社会网络层次对农民工工资水平的影响。基于2009年北京市农民工调查数据的计量结果,支持了高层次社会网络影响归属该网络的农民工、使得后者工资水平提高的假设;支持了高层次社会网络除了帮助农民工找工作之外,也可以在就业后通过影响行为模式和生产率来提高工资水平的假设。本文用倾向得分匹配的平均处置效应处理可能的内生性偏误,结论通过了较为严格的稳健性检验。政府鼓励农民工构建基于城市就业和生活的新型社会关系以及高质量的社会网络,不仅可能提高农民工的劳动生产率和相应的工资水平,而且可能提高整个国家人力资本投资的回报水平和劳动生产率水平。     

对城市粪便和垃圾的收集与处理

本文对粪便是水污染的根源作了阐述，提出了粪便与污水分流，同时还可从粪便中制取最好的生物肥料，变废为宝，强化生物链，以取得较好的生态、经济、社会三大效益。     

Dynamic labour supply effects of childcare subsidies: Evidence from a Canadian natural experiment on low-fee universal child care

This paper shows that a temporary incentive to join the labor market or to work more can also produce substantial life-cycle labour supply effects. On September 1997, a new childcare policy was initiated by the provincial government of Québec, the second most populous province in Canada. Licensed and regulated providers of childcare services began offering day care spaces at the subsidized fee of $5/day/child for children aged 4. In successive years, the government reduced the age requirement, created new childcare facilities and spaces, and paid for the additional costs entailed by this low-fee policy. No such important policy changes for preschool (including kindergarten) children were enacted in the nine other Canadian provinces over the years 1997–2004. Using annual data drawn from Statistics Canada's Survey on Labour and Income Dynamics and a difference-in-differences quasi-experimental methodology, the paper estimates the dynamic labour supply effects of the program. The results demonstrate that the policy had long-term labour supply effects on mothers who benefited from the program when their child was less than 6. A striking feature of the results is that they are driven by changes in the labour supply of less educated mothers.     

Treatment patterns and healthcare costs among newly-diagnosed patients with chronic myeloid leukemia receiving dasatinib or nilotinib as first-line therapy in the United States

Objective: To compare treatment patterns and economic outcomes of dasatinib and nilotinib as 1st-line therapies for chronic myeloid leukemia (CML).

Methods: Adult CML patients initiated on first-line dasatinib or nilotinib in 2010–2014 were identified from two large US administrative claims databases. Treatment patterns, tyrosine kinase inhibitor (TKI) adherence and healthcare resource utilization (HRU) and costs were measured from the 1st-line TKI initiation (index date) to the end of follow-up.

Results: A total of 604 and 418 patients were included in the dasatinib and nilotinib cohorts (mean ages = 50.9 and 52.5 years, 46.4% and 45.7% female), respectively. Among the dasatinib patients, 91% started with 100?mg/day, 3% with <100?mg/day, and 6% with >100?mg/day. Among the nilotinib patients, 76% started with 600?mg/day, 16% with >600?mg/day, and 8% <600?mg/day. The dasatinib cohort had a higher hazard of dose decrease (hazard ratio [HR]?=?1.66; p?=?.002) and of switching to another TKI (HR =1.62; p?=?.019) compared to the nilotinib cohort. The hazard of dose increase (HR =0.76; p?=?.423) and treatment discontinuation (HR =1.10; p?=?.372) were not significantly different between cohorts. There was also no significant difference in TKI adherence levels (mean proportion of days covered [PDC] difference over first 6 months = ?0.0003, p?=?.981; mean PDC difference over first 12 months = ?0.0022, p?=?.880) and HRU (inpatient day incidence rate ratio [IRR]?=?1.03, p?=?.930; emergency room IRR =1.26, p?=?.197; and days with outpatient services IRR = 1.01, p?=?.842). The dasatinib cohort incurred higher healthcare costs by $749 per patient per month (p?=?.044) compared to the nilotinib cohort.

Limitation: Information on CML phase and Sokal score was not available.

Conclusions: Dasatinib was associated with an increased hazard of dose decrease and switching to another TKI and higher healthcare costs, vs nilotinib.     

Public health impact of comprehensive hepatitis C screening and treatment in the French baby-boomer population

Objective: To estimate the public health impact of comprehensive hepatitis C virus (HCV) screening and access to all-oral, interferon (IFN)-free direct-acting antivirals (DAAs) in the French baby-boomer population (1945–1965 birth cohorts).

Methods: A sequential, multi-cohort, health-state transition model was developed to assess the impact of different hepatitis C screening and treatment strategies on clinical and economic outcomes in the 1945–1965 birth cohorts. Patients newly-diagnosed with chronic HCV were projected each year from 2016 to 2036 under three screening scenarios (70% [low], 75% [intermediate], and 80% [high] HCV awareness in 2036). Healthcare costs and clinical outcomes (number of liver-related deaths, quality-adjusted life-years [QALYs], life-years [LYs] spent in sustained virologic response [SVR] or with decompensated cirrhosis, hepatocellular carcinoma, or liver transplant) were compared among five treatment strategies (no antiviral therapy; IFN?+?ribavirin?+?protease inhibitor for fibrosis stages F2–F4, IFN-based DAAs for stages F2–F4, IFN-free DAAs for stages F2–F4, and IFN-free DAAs for stages F0–F4).

Results: Diagnosis of HCV genotype 1 was projected for 4,953, 6,600, and 8,368 individuals in the low, intermediate, and high screening scenarios, respectively. In the intermediate scenario, IFN-free DAAs for stages F0–F4 had a favorable cost-effectiveness profile vs IFN-based or IFN-free treatment strategies for F2–F4 and offered the greatest return on investment (0.899 LYs gained in SVR and 0.933 QALYs per €10,000 invested).

Conclusion: Comprehensive HCV screening and access to all-oral, IFN-free DAAs is a cost-effective strategy that could help diminish the upcoming burden of HCV in the French baby-boomer population.     

农民国民待遇与制度伦理分析--兼论"三农"问题的解决对策

本文试图从制度伦理这一本原层面来探讨"三农"问题的解决途径。首先阐述了制度的本质,论证了制度绩效与制度伦理之间有着密切的正相关关系,并且认为自由与平等是制度伦理的两大基本原则,在此基础上指出,根据制度伦理精神,给予农民国民待遇是解决"三农"问题的必然选择,具体而言,就是废除二元户籍制度,给农民以真正自由的权利;改革不平衡的财税体制,使农民享受到均等的公共品供应和一视同仁的社会保障。     

"民工荒"的成因及对策分析

本文根据托达罗预期收益理论,对2004年以来我国部分地区出现的“民工荒”现象进行了分析,认为“民工荒”是农民工对预期收益与成本进行比较分析后做出的选择,并提出,要解决“民工荒”问题必须从提高农民工的工资待遇和改善农民工的社会福利入手。     

The treatment effect of borders on trade. The great war and the disintegration of Central Europe

This paper investigates the impact of changes in national border demarcation on economic integration. It treats the national breakups in Central Europe due to WWI as a natural experiment. The set-up allows to control for selection bias when estimating the impact of national borders on trade. A gravity model of trade is used to analyze goods-specific trade among Central European regions. The main results are, first, that systematic deviations of the observations under “border treatment” are found. Regions pairs that became separated by a new national border after WWI, tended to have below average levels of economic integration already before the war. A comparison of actual and biased result for goods-specific trade yields a difference of between 21 and 86% ad-valorem tariff equivalent, and might well be higher for certain goods. Second, the analysis indicates that cross-border integration was indeed lower after WWI but that this change was economically significant only for certain sectors. Third, in the interwar period, international trade was less diverted by borders first established after the war than by borders existing already before WWI. The results stress the importance of relative barriers to trade in attenuating the adverse effects of WWI on economic integration.

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Impact of Ghana's agricultural mechanization services center program

Use of mechanization in African agriculture has returned strongly to the development agenda, particularly following the recent high food prices crisis. Many developing country governments—including Ghana, the case study of this article—have resumed support for agricultural mechanization, typically in the form of subsidies for tractor purchase and establishment of private‐sector‐run agricultural mechanization service centers (AMSECs). The aim of this article is to assess the impact of Ghana's AMSEC program on various farm household outcomes, using data from surveys that were conducted with 270 farm households. A two‐stage propensity score matching and difference‐in‐difference estimation procedure is used to estimate the impacts of the program, employing different definitions of treatment, model specifications, and matching algorithms to assess sensitivity of the estimator to different assumptions. The results indicate that the AMSEC program has had a mixed impact on different outcome indicators. For example, whereas the program has contributed to improving availability of mechanization services, reducing drudgery, and raising yield, it has had no impact on the change in the prices paid by farmers for the services used and the change in the amount of area plowed. Implications of the results on labor‐mechanization substitution and for raising and sustaining productivity further are drawn.