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Gender-Based Favoritism in Blood Donations: Evidence from a Field Experiment 基于性别的献血偏袒:来自现场实验的证据
Pub Date : 2019-04-01 DOI: 10.2139/ssrn.3396369
Danijela Vuletić
This paper provides the first evidence of the existence of gender-based favoritism in life saving decisions to donate blood. We conduct a field experiment among blood donors from Bosnia and Herzegovina where we exogenously manipulate the signal of a blood recipient’s gender by adding his/her name, and photograph, to a letter soliciting blood donation. Motivated by the literature on identity, we test the influence on donation behavior of two dimensions of shared identity between donor and recipient – gender and age. 74% more blood donors donate if the potential blood recipient is of the same gender. This result is mostly driven by male donors donating to a male recipient. In contrast to gender identity being an important determinant in fostering donors’ participation rates, being of similar age to the blood recipient has relatively little effect. By identifying an important factor that influences willingness to give blood, our results have implications for better targeting of campaigns to increase blood donations.
这篇论文提供了第一个证据,证明在献血的救命决定中存在基于性别的偏袒。我们在波斯尼亚和黑塞哥维那的献血者中进行了一项实地实验,我们通过将他/她的名字和照片添加到征求献血的信中,来外源性地操纵献血者的性别信号。在身份认同研究文献的启发下,本研究从性别和年龄两个维度对捐赠行为的影响进行了验证。如果潜在的血液接受者是同性的,74%的献血者会献血。这一结果主要是由男性捐赠者向男性接受者捐赠所致。与性别认同是促进献血者参与率的重要决定因素相反,与接受血液者年龄相仿的影响相对较小。通过确定影响献血意愿的一个重要因素,我们的研究结果对更好地有针对性地增加献血活动具有启示意义。
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引用次数: 0
What Works to Reduce Inequalities in Higher Education? A Systematic Review of the (Quasi-)Experimental Literature on Outreach and Financial Aid 如何减少高等教育中的不平等?外延与经济援助(准)实验文献的系统回顾
Pub Date : 2019-04-01 DOI: 10.1596/1813-9450-8802
Estelle Herbaut, K. Geven
Policy makers are increasingly searching for ways to allow more disadvantaged students to access and complete higher education. The quickly growing (quasi-)experimental literature on policy interventions in higher education provide the opportunity to identify the causal effects of these interventions on disadvantaged students and discuss inequality mechanisms at the last stage of the educational system. The paper reviews 75 studies and rigorously compares more than 200 causal effects of outreach and financial aid interventions on the access and completion rates of disadvantaged students in higher education. The paper finds that outreach policies are broadly effective in increasing access for disadvantaged students when these policies include active counseling or simplify the university application process, but not when they only provide general information on higher education. For financial aid, the paper finds that need-based grants do not systematically increase enrollment rates but only lead to improvements when they provide enough money to cover unmet need and/or include an early commitment during high school. Still, need-based grants quite consistently appear to improve the completion rates of disadvantaged students. In contrast, the evidence indicates that merit-based grants only rarely improve the outcomes of disadvantaged students. Finally, interventions combining outreach and financial aid have brought promising results, although more research on these mixed interventions is needed.
政策制定者正在越来越多地寻找方法,让更多的弱势学生能够接受并完成高等教育。关于高等教育政策干预的快速增长(准)实验文献提供了机会来确定这些干预对弱势学生的因果影响,并讨论教育系统最后阶段的不平等机制。本文回顾了75项研究,并严格比较了推广和经济援助干预对弱势学生接受高等教育的机会和完成率的200多个因果影响。本文发现,当外联政策包括积极的咨询或简化大学申请过程时,这些政策在增加弱势学生的入学机会方面普遍有效,但当他们只提供高等教育的一般信息时,这些政策就无效了。对于经济援助,论文发现基于需求的资助并不能系统地提高入学率,只有当它们提供足够的资金来满足未满足的需求和/或包括高中阶段的早期承诺时,才会导致入学率的提高。尽管如此,基于需求的助学金似乎始终如一地提高了弱势学生的毕业率。相比之下,有证据表明,基于成绩的资助很少能改善弱势学生的成绩。最后,结合外联和财政援助的干预措施带来了有希望的结果,尽管需要对这些混合干预措施进行更多的研究。
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引用次数: 50
Freedom of Choice in Pension Plans: Evidence from a Quasi-Natural Experiment 养老金计划的选择自由:来自准自然实验的证据
Pub Date : 2019-03-30 DOI: 10.2139/ssrn.3043020
C. Hong
Employee pension plans in most countries limit participants' choice to a pre-selected 'menu' of funds. How would funds react if participants were allowed to choose funds from outside of such a limited menu? This paper exploits a pension policy reform in Hong Kong to study funds' reaction using a difference-in-difference approach. The findings indicate that funds, catering to participants' preferences, started charging lower fees after the reform. In the meantime, they adopted a less active investment strategy and gross return deteriorated. The findings suggest that the freedom of choice affects participants' wealth indirectly through the endogenous response of funds.
大多数国家的雇员养老金计划将参与者的选择限制在预先选定的基金“菜单”上。如果参与者被允许从如此有限的菜单之外选择基金,各基金将作何反应?本文以香港的养老金政策改革为研究对象,采用“差中差”方法研究基金的反应。研究结果表明,改革后,基金开始迎合参与者的偏好,收取较低的费用。与此同时,他们采取了不那么积极的投资策略,总回报恶化。研究结果表明,选择自由通过资金的内生反应间接影响参与者的财富。
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引用次数: 2
The Third Theorem of Welfare Economics: Report from a Fictional Field Study 福利经济学第三定理:一个虚构的实地研究报告
Pub Date : 2019-03-01 DOI: 10.2139/ssrn.3390259
K. Nyborg
The perfectly competitive market – a hypothetical situation free of market failure – is the basis for the two fundamental welfare theorems, and an important benchmark for economic theory. The radical abstractions of this idea, however, make its full implications hard to grasp. I address this using literary fiction. Part I discusses fiction as a tool for economic theory. Part II is a story about a journey to the perfectly competitive market. Part III develops main theoretical insights based on the story: First, complete social isolation is needed to preclude market failure. Second, the requirements of symmetric information and no external effects are extremely hard to reconcile, leading to an impossibility theorem: if trade is permitted anytime, and deliberate, welfare-relevant learning is feasible, no perfectly competitive market can exist.
完全竞争市场——一种没有市场失灵的假设情况——是两个基本福利定理的基础,也是经济理论的重要基准。然而,这种思想的极端抽象使其全部含义难以理解。我用文学小说来解决这个问题。第一部分讨论小说作为经济理论的工具。第二部分是关于完全竞争市场之旅的故事。第三部分根据这个故事提出了主要的理论见解:首先,需要完全的社会隔离来防止市场失灵。第二,信息对称和没有外部影响的要求很难调和,这就产生了一个不可能定理:如果任何时候都允许交易,并且有意识的、与福利相关的学习是可行的,那么就不可能存在完全竞争的市场。
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引用次数: 2
Do Firms Exit the Formal Economy after a Minimum Wage Hike? 最低工资上调后,企业会退出正规经济吗?
Pub Date : 2019-02-15 DOI: 10.1596/1813-9450-8749
Ayşenur Acar, Laurent Bossavie
This paper explores the effects of a large increase in the national minimum wage in Turkey on firms’ exit rates from the formal economy. The analysis exploits a unique, linked employer-employee panel data set of the universe of registered firms in all sectors of the economy. The causal impact of the minimum wage hike is estimated by using pre-policy information on the full distribution of wages in registered firms as a measure of exposure to treatment, and by implementing a difference-in-difference estimation strategy. The minimum wage hike is found to increase firms’ exit rates from the formal economy by 12 percent. This suggests that firm exits attributable to the minimum wage hike could account for up to one-third of the total formal employment destruction that occurred between 2015 and 2016. The minimum wage effect on exit rates is found to be larger among firms with low productivity levels before the policy change, and in sectors where profit margins are low. A range of placebo tests and robustness checks indicate that these findings are not driven by trends in unobservable characteristics correlated with exposure to the minimum wage hike.
本文探讨了土耳其国家最低工资大幅提高对企业退出正规经济的影响。该分析利用了一个独特的、相互关联的雇主-雇员面板数据集,该数据集涵盖了所有经济部门的注册公司。最低工资上涨的因果影响是通过使用关于注册企业工资全部分配的政策前信息作为待遇暴露的衡量标准,并通过实施差中差估计策略来估计的。研究发现,提高最低工资使企业退出正规经济的比率提高了12%。这表明,由于最低工资上涨导致的企业退出,可能占2015年至2016年间正式就业总损失的三分之一。研究发现,在政策变化前生产率水平较低的企业和利润率较低的行业,最低工资对退出率的影响更大。一系列安慰剂测试和稳健性检查表明,这些发现并非由与最低工资上涨相关的不可观察特征的趋势所驱动。
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引用次数: 7
Adaptive Experimental Design: Prospects and Applications in Political Science 适应性实验设计:政治学的前景与应用
Pub Date : 2019-02-12 DOI: 10.2139/ssrn.3364402
Molly Offer-Westort, A. Coppock, D. Green
Experimental researchers in political science frequently face the problem of inferring which of several treatment arms is most effective. They may also seek to estimate mean outcomes under that arm, construct confidence intervals, and test hypotheses. Ordinarily, multi-arm trials conducted using static designs assign participants to each arm with fixed probabilities. However, a growing statistical literature suggests that adaptive experimental designs that dynamically allocate larger assignment probabilities to more promising treatments are better equipped to discover the best-performing arm. Using simulations and empirical applications, we explore the conditions under which such designs hasten the discovery of superior treatments and improve the precision with which their effects are estimated. Recognizing that many scholars seek to assess performance relative to a control condition, we also develop and implement a novel adaptive algorithm that seeks to maximize the precision with which the largest treatment effect is estimated.
政治科学的实验研究人员经常面临这样的问题:在几种治疗手段中,哪一种最有效。他们还可能试图估计该分支下的平均结果,构建置信区间,并检验假设。通常,使用静态设计进行的多组试验以固定的概率将参与者分配到每个组。然而,越来越多的统计文献表明,动态地将更大的分配概率分配给更有前途的治疗方法的适应性实验设计更有能力发现表现最好的治疗方法。通过模拟和经验应用,我们探索了在何种条件下,这种设计可以加速发现更好的处理方法,并提高其效果估计的精度。认识到许多学者试图评估相对于控制条件的性能,我们还开发并实现了一种新的自适应算法,旨在最大限度地提高精度,以估计最大的治疗效果。
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引用次数: 23
Algorithm for Producing Rankings Based on Expert Surveys 基于专家调查的排名生成算法
Pub Date : 2019-01-10 DOI: 10.3390/a12010019
Indra Overland, Javlon Juraev
This paper develops an automated algorithm to process input data for segmented string relative rankings (SSRRs). The purpose of the SSRR methodology is to create rankings of countries, companies, or any other units based on surveys of expert opinion. This is done without the use of grading systems, which can distort the results due to varying degrees of strictness among experts. However, the original SSRR approach relies on manual application, which is highly laborious and also carries a risk of human error. This paper seeks to solve this problem by further developing the SSRR approach by employing link analysis, which is based on network theory and is similar to the PageRank algorithm used by the Google search engine. The ranking data are treated as part of a linear, hierarchical network and each unit receives a score according to how many units are positioned below it in the network. This approach makes it possible to efficiently resolve contradictions among experts providing input for a ranking. A hypertext preprocessor (PHP) script for the algorithm is included in the article’s appendix. The proposed methodology is suitable for use across a range of social science disciplines, especially economics, sociology, and political science.
本文开发了一种自动处理分段字符串相对排序(ssrr)输入数据的算法。SSRR方法的目的是根据专家意见的调查,对国家、公司或任何其他单位进行排名。这是在没有使用评分系统的情况下完成的,由于专家之间的严格程度不同,评分系统可能会扭曲结果。然而,最初的SSRR方法依赖于手动应用程序,这是非常费力的,并且还存在人为错误的风险。本文试图通过利用链接分析进一步发展SSRR方法来解决这一问题,该方法基于网络理论,类似于Google搜索引擎使用的PageRank算法。排名数据被视为线性分层网络的一部分,每个单元根据网络中位于其下方的单元数量获得分数。这种方法可以有效地解决为排名提供输入的专家之间的矛盾。本文的附录中包含了该算法的超文本预处理器(PHP)脚本。所提出的方法适用于各种社会科学学科,特别是经济学、社会学和政治学。
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引用次数: 6
Be Wary of Those Who Ask: A Randomized Experiment on the Size and Determinants of the Enumerator Effect 警惕那些问问题的人:一个关于枚举效应的大小和决定因素的随机实验
Pub Date : 2018-12-01 DOI: 10.1596/1813-9450-8671
Michele Di Maio, N. Fiala
During survey data collection, respondents’ answers may be influenced by the behavior and characteristics of the enumerator, the so-called enumerator effect. Using a large-scale experiment in Uganda in which the study randomly pairs enumerators and respondents, the study explores for which types of questions the enumerator effect may exist. It is found that the enumerator effect is minimal in many questions, but is large for political preference questions, for which it can account for over 30 percent of the variation in responses. The study then explores which enumerator characteristics, and which of their combination with respondent characteristics, could account for this effect. Finally, the conclusion provides some practical suggestions on how to minimize enumerator effects, and potential bias, in various types of data collections.
在调查数据收集过程中,被调查者的回答可能会受到普查员的行为和特征的影响,即所谓的普查员效应。在乌干达进行的一项大规模实验中,该研究将普查员和受访者随机配对,探讨了普查员效应可能存在于哪些类型的问题。研究发现,枚举效应在许多问题中是最小的,但在政治偏好问题中是很大的,它可以解释30%以上的回答差异。然后,该研究探讨了枚举员的哪些特征,以及它们与被调查者特征的哪些组合,可以解释这种影响。最后,本文就如何在不同类型的数据收集中最大限度地减少枚举效应和潜在偏差提供了一些实用建议。
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引用次数: 34
Forest Carbon Supply in Nepal: Evidence from a Choice Experiment 尼泊尔森林碳供应:来自选择实验的证据
Pub Date : 2018-11-01 DOI: 10.1596/1813-9450-8648
S. Dissanayake, R. Bluffstone, E. Somanathan, H. Luintel, N. Paudel, M. Toman
This paper uses a choice experiment conducted in Nepal during 2013 to estimate household-level willingness to participate in a village-level program under the Reduced Emissions from Deforestation and Forest Degradation initiative requiring reductions in fuelwood collection, as a function of the price paid per unit of avoided carbon dioxide emissions. The analysis examines incentives to participate both in villages having formal community forest management, the core institution for implementing Reduced Emissions from Deforestation and Forest Degradation, and villages having only informal forest user groups. Contrary to previous findings in the literature about participation incentives, but in keeping with other recent studies of Reduced Emissions from Deforestation and Forest Degradation pilots in Nepal, this study finds that relatively little emission reduction would take place at prices of $1.00 to $5.00 per ton of avoided carbon emissions. Formal community forests will almost certainly be the core institution within which Reduced Emissions from Deforestation and Forest Degradation is implemented in Nepal and likely other countries. The study finds that average and median values of payment required for agreement to reduce fuelwood collection are substantially larger for formal forest user groups than in informal communities. This reflects that formal groups likely already have fuelwood collection restrictions in place, whereas informal groups may de facto permit open access extraction. The analysis also suggests that households that are part of informal groups react to Reduced Emissions from Deforestation and Forest Degradation very differently than households that are formal group members. Broadly speaking,"underprivileged"formal group member households, such as those who are landless, female-headed, and poor, appear to be warier of fuelwood collection restrictions and thus require higher payments than average respondents. This difference does not appear to carry over to informal group members.
本文利用2013年在尼泊尔进行的一项选择实验,估计了家庭层面参与“减少毁林和森林退化排放倡议”下的村级项目的意愿,该项目要求减少薪柴收集,并将其作为每单位避免二氧化碳排放所支付的价格的函数。该分析考察了参与有正式社区森林管理的村庄(实施减少毁林和森林退化造成的排放的核心机构)和只有非正式森林用户群体的村庄的动机。与先前文献中关于参与激励的研究结果相反,但与最近尼泊尔关于减少毁林和森林退化导致的排放试点的其他研究一致,本研究发现,在每吨避免碳排放的价格为1美元至5美元时,减少的排放量相对较少。正式的社区森林几乎肯定会成为尼泊尔以及其他国家实施减少毁林和森林退化造成的排放的核心机构。研究发现,正式森林用户群体为达成减少薪材收集的协议所需支付的平均值和中位数要比非正式社区大得多。这反映了正式群体可能已经有了薪材收集限制,而非正式群体实际上可能允许开放开采。分析还表明,作为非正式群体一部分的家庭对减少毁林和森林退化造成的排放的反应与作为正式群体成员的家庭非常不同。一般来说,“弱势”正式群体成员家庭,如无地、女户主和贫穷的家庭,似乎对收集薪材的限制更为谨慎,因此需要比一般受访者支付更高的款项。这种差异似乎不会延续到非正式群体成员身上。
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引用次数: 0
Report on Financial Investments of Italian Households. Behavioural Attitudes and Approaches - 2018 Survey 意大利家庭金融投资报告。行为态度和方法- 2018年调查
Pub Date : 2018-10-22 DOI: 10.2139/ssrn.3271018
Valeria Caivano, Monica Gentile, N. Linciano, P. Soccorso
The 2018 edition of the CONSOB Report on financial investments of Italian households presents evidence on the financial choices of a representative sample of 1,601 Italian households while significantly deepening the analysis of financial knowledge and individual attitudes. After the first Section on trends in household wealth, savings and financial inclusion, the second Section examines several personal inclinations that may deeply affect financial behaviours. In particular, self-evaluation on preference for numerical information, need for cognition, financial anxiety, self-efficacy and self-control are elicited, as well as the attitude towards optimism and generalised trust. These traits are found to be associated with financial knowledge, both actual and perceived, and risk preferences (Section 3) as well as financial control and saving habits (Section 4), investment choices and demand for investment advice (Section 5 and 6, respectively). The last Section of the Report focuses on respondents’ intention to learn finance and monitor household budget in the vein of the Theory of planned behaviour. Overall, the evidence gathered confirms that much remains to be done in order to raise Italian households’ financial knowledge, the quality of their financial choices as well as their awareness of the need to improve their financial competencies.
2018年版CONSOB意大利家庭金融投资报告提供了1,601个意大利家庭代表性样本的金融选择证据,同时显著深化了对金融知识和个人态度的分析。在第一部分讨论家庭财富、储蓄和普惠金融的趋势之后,第二部分探讨了可能深刻影响金融行为的几个个人倾向。尤其是对数字信息的偏好、认知需求、财务焦虑、自我效能和自我控制的自我评价,以及对乐观和广义信任的态度。这些特征被发现与实际和感知的金融知识、风险偏好(第3节)、财务控制和储蓄习惯(第4节)、投资选择和对投资建议的需求(第5节和第6节)有关。报告的最后一部分着重于受访者在计划行为理论的指导下学习金融和监控家庭预算的意愿。总的来说,收集到的证据证实,要提高意大利家庭的金融知识、金融选择的质量以及提高金融能力的意识,还有很多工作要做。
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引用次数: 0
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Political Methods: Experiments & Experimental Design eJournal
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