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Assessing the Age Specificity of Infection Fatality Rates for COVID-19: Systematic Review, Meta-analysis, & Public Policy Implications 评估COVID-19感染致死率的年龄特异性:系统评价、荟萃分析和公共政策影响
Pub Date : 2020-07-01 DOI: 10.3386/w27597
Andrew T. Levin, W. Hanage, Nana Owusu-Boaitey, Kensington B. Cochran, Seamus P. Walsh, G. Meyerowitz-katz
This paper assesses the age specificity of the infection fatality rate (IFR) for COVID-19. Our benchmark meta-regression synthesizes the age-specific IFRs from six recent large-scale seroprevalence studies conducted in Belgium, Geneva, Indiana, New York, Spain, and Sweden. The estimated IFR is close to zero for children and younger adults but rises exponentially with age, reaching about 0.3 percent for ages 50-59, 1.3 percent for ages 60-69, 4.6 percent for ages 70-79, and 25 percent for ages 80 and above. We compare those predictions to the age-specific IFRs implied by recent seroprevalence estimates for nine other U.S. locations, three smale-scale studies, and three countries (Iceland, New Zealand, and Republic of Korea) that have engaged in comprehensive tracking and tracing of COVID-19 infections. We also review seroprevalence studies of 32 other locations whose design was not well-suited for estimating age-specific IFRs. Our findings indicate that COVID-19 is not just dangerous for the elderly and infirm but also for healthy middle-aged adults, for whom the fatality rate is more than 50 times greater than the risk of dying in an automobile accident. Consequently, the overall IFR for a given location is intrinsically linked to the age-specific pattern of infections. In a scenario where the U.S. infection rate reaches 20 percent, our analysis indicates that protecting vulnerable age groups could prevent more than 200,000 deaths.
本文评估了COVID-19感染病死率(IFR)的年龄特异性。我们的基准荟萃回归综合了最近在比利时、日内瓦、印第安纳、纽约、西班牙和瑞典进行的六项大规模血清患病率研究的年龄特异性ifr。估计的IFR在儿童和年轻人中接近于零,但随着年龄的增长呈指数增长,50-59岁约为0.3%,60-69岁为1.3%,70-79岁为4.6%,80岁及以上为25%。我们将这些预测与最近美国其他9个地区、3项小规模研究和3个国家(冰岛、新西兰和韩国)的血清患病率估计所暗示的年龄特异性ifr进行了比较,这些国家都参与了COVID-19感染的全面跟踪和追踪。我们还回顾了其他32个地区的血清患病率研究,这些研究的设计不太适合估计年龄特异性ifr。我们的研究结果表明,COVID-19不仅对老年人和体弱者很危险,而且对健康的中年人也很危险,对他们来说,死亡率是车祸死亡风险的50倍以上。因此,给定地点的总体IFR与特定年龄的感染模式具有内在联系。在美国感染率达到20%的情况下,我们的分析表明,保护弱势群体可以防止20多万人死亡。
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引用次数: 13
Experimental Evidence on Alternative Policies to Increase Learning at Scale 增加大规模学习的替代政策的实验证据
Pub Date : 2020-06-01 DOI: 10.3386/w27298
Annie Duflo, Jessica Kiessel, Adrienne M. Lucas
Randomized controlled trials in lower-income countries have demonstrated ways to increase learning, in specific settings. This study uses a large-scale, nationwide RCT in Ghana to show the external validity of four school-based interventions inspired by other RCTs. Even though the government implemented the programs within existing systems, student learning increased across all four models, more so for female than male students, and many gains persisted one year after the program ended. Three of the four interventions had a similar cost effectiveness. The intervention that directly targeted classroom teachers increased the likelihood that teachers were engaged with students.
在低收入国家进行的随机对照试验证明了在特定环境下增加学习的方法。本研究在加纳进行了一项大规模的全国性随机对照试验,以显示受其他随机对照试验启发的四项基于学校的干预措施的外部有效性。尽管政府在现有系统内实施了这些项目,但所有四种模式的学生学习成绩都有所提高,女性学生的学习成绩高于男性学生,而且许多成绩在项目结束一年后仍然存在。四种干预措施中有三种具有类似的成本效益。直接针对课堂教师的干预增加了教师与学生互动的可能性。
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引用次数: 21
Measuring the Environmental Benefits of Electric Vehicles (Relative to the Car that Wasn’t Bought) 衡量电动汽车的环境效益(相对于未购买的汽车)
Pub Date : 2020-05-21 DOI: 10.3386/w27197
E. Muehlegger, D. Rapson
The true net environmental benefit of an electric vehicle (EV) is measured relative to the vehicle that an EV buyer would have bought and driven had they not opted for an EV. This “counterfactual” vehicle cannot be observed, but its fuel economy can be estimated. We use quasi-experimental variation in a generous California EV subsidy program to show that buyers of EVs would have, on average, purchased relative fuel-efficient gasoline-powered cars had they not gone electric. The true incremental pollution abatement arising from the EV is thus substantially smaller when compared to this appropriate reference vehicle, as opposed to, say, the average new passenger car.
电动汽车(EV)的真正净环境效益是相对于电动汽车购买者在没有选择电动汽车的情况下购买和驾驶的车辆来衡量的。这种“反事实”车辆无法被观察到,但它的燃油经济性可以被估计出来。我们在加州一项慷慨的电动汽车补贴计划中使用了准实验变量来表明,如果电动汽车的购买者没有购买电动汽车,他们平均会购买相对节能的汽油动力汽车。因此,与普通的新乘用车相比,电动汽车带来的真正增量污染减排要小得多。
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引用次数: 2
A No-Arbitrage Perspective on Global Arbitrage Opportunities 全球套利机会的无套利视角
Pub Date : 2020-05-21 DOI: 10.3386/w27231
Patrick Augustin, Mikhail Chernov, L. Schmid, Dongho Song
We revisit the recent literature on persistent deviations from covered interest parity (CIP) by showing theoretically that CIP violations imply arbitrage opportunities only if uncollateralized interbank lending rates are riskless. In the absence of observable riskless discount rates, we extract them empirically using a simple no-arbitrage framework. They deliver novel quantitative benchmarks for foreign exchange contracts that match observed forward currency premiums and cross-currency basis swap rates well. The no-arbitrage benchmarks account for about two thirds of the alleged CIP deviations, while the residual pricing errors line up with measures of intermediary constraints and the expensiveness of the U.S. dollar.
我们通过从理论上表明CIP违规仅在无抵押银行间贷款利率为无风险时才意味着套利机会,重新审视了最近关于持续偏离覆盖利率平价(CIP)的文献。在没有可观察到的无风险贴现率的情况下,我们使用一个简单的无套利框架来提取它们。它们为外汇合约提供了新的量化基准,与观察到的远期货币溢价和跨货币基差掉期利率很好地匹配。在所谓的CIP偏差中,无套利基准约占三分之二,而剩余定价误差与中介约束指标和美元的昂贵程度相符。
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引用次数: 9
The Contribution of Chinese Diaspora Researchers to Global Science and China's Catching Up in Scientific Research 海外华人学者对全球科学的贡献与中国科学研究的赶超
Pub Date : 2020-05-01 DOI: 10.3386/w27169
Qingnan Xie, Richard B. Freeman
China-born scientists and engineers who conduct their research outside China, the diaspora researchers of our title, contributed to global science through the exceptional quantity and quality of their scientific work and through distinctive connections to China-based researchers and research. Analysis of the Scopus database of English language scientific journal articles shows that Chinese diaspora research publications are a substantial and growing proportion of global scientific publications, receive an above average number of citations per article, and are published at above average rates in high Scopus CiteScore journals. In addition, diaspora researchers helped China advance to the forefront of science through collaboration on papers with China-based researchers and through the citation network linking China-based research to research outside the country.
在中国以外进行研究的中国出生的科学家和工程师,即我们所称的海外研究人员,通过他们卓越的科学工作数量和质量,以及与中国研究人员和研究的独特联系,为全球科学做出了贡献。对Scopus英文科学期刊文章数据库的分析表明,华人研究出版物在全球科学出版物中所占的比例相当大,而且还在不断增长,每篇文章的引用次数高于平均水平,在高Scopus CiteScore期刊上的发表率也高于平均水平。此外,海外研究人员通过与中国研究人员合作撰写论文,以及通过将中国研究与国外研究联系起来的引文网络,帮助中国走到了科学前沿。
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引用次数: 2
The Boll Weevil’s Impact on Racial Income Gaps in the Early Twentieth Century 20世纪初棉铃象鼻虫对种族收入差距的影响
Pub Date : 2020-05-01 DOI: 10.3386/w27101
K. Clay, Ethan Schmick, Werner Troesken
This paper investigates the effect of a large negative agricultural shock, the boll weevil, on black-white inequality in the first half of the twentieth century. To do this we use complete count census data to generate a linked sample of fathers and their sons. We find that the boll weevil induced enormous labor market and social disruption as more than half of black and white fathers moved to other counties following the arrival of the weevil. The shock impacted black and white sons differently. We compare sons whose fathers initially resided in the same county and find that white sons born after the boll weevil had similar wages and schooling outcomes to white sons born prior to its arrival. In contrast, black sons born after the boll weevil had significantly higher wages and years of schooling, narrowing the black-white wage and schooling gaps. This decrease appears to have been driven by relative improvements in early life conditions and access to schooling both for sons of black fathers that migrated out of the South and sons of black fathers that stayed in the South.
本文研究了20世纪上半叶一个巨大的负面农业冲击——棉铃象鼻虫对黑人和白人不平等的影响。为了做到这一点,我们使用完整的人口普查数据来生成父亲和他们儿子的关联样本。我们发现,棉铃象鼻虫引起了巨大的劳动力市场和社会混乱,因为超过一半的黑人和白人父亲在象鼻虫到来后搬到了其他县。这种冲击对黑人和白人儿子的影响不同。我们比较了父亲最初居住在同一县的儿子,发现在棉铃象鼻虫到来之后出生的白人儿子与在棉铃象鼻虫到来之前出生的白人儿子的工资和学业成绩相似。相比之下,在棉铃象鼻虫之后出生的黑人儿子的工资和受教育年限明显更高,缩小了黑人和白人的工资和受教育年限差距。这种下降似乎是由早期生活条件和受教育机会的相对改善所驱动的,无论是黑人父亲迁出南方的儿子,还是黑人父亲留在南方的儿子。
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引用次数: 1
Asset Prices and Aggregate Demand in a "Covid-19" Shock: A Model of Endogenous Risk Intolerance and LSAPs “Covid-19”冲击中的资产价格和总需求:一个内生风险不耐受和LSAPs模型
Pub Date : 2020-04-23 DOI: 10.3386/W27044
Ricardo J. Caballero, Alp Simsek
In this paper we: (i) provide a model of the endogenous risk intolerance and severe aggregate demand contractions following a large real (non-financial) shock; and (ii) demonstrate the effectiveness of Large Scale Asset Purchases (LSAPs) in addressing these contractions. The key mechanism stems from heterogeneous risk tolerance: as a recessionary shock hits the economy and brings down asset prices, risk-tolerant agents' wealth share declines and their leverage rises endogenously. This reduces the market's risk tolerance and generates downward pressure on asset prices and aggregate demand. When monetary policy is unconstrained, it can offset the decline in risk tolerance with an interest rate cut that boosts the market's Sharpe ratio. However, if the interest rate policy is constrained, new contractionary feedbacks arise: recessionary shocks lead to further asset price and output drops, which feed the risk-off episode and trigger a downward loop. In this context, LSAPs improve asset prices and aggregate demand by transferring risk to the government's balance sheet, which reduces the market's required Sharpe ratio. Optimal LSAPs are larger when the (consolidated) government has greater future fiscal capacity and the downward spiral is more severe. In an extension, we show how corporate debt overhang problems strengthen our mechanisms. The Covid-19 shock and the large response by all the major central banks provide a vivid illustration of the environment we seek to capture.
在本文中,我们:(i)提供了一个内生风险不耐受和严重总需求收缩的模型,该模型是在巨大的实际(非金融)冲击之后出现的;(ii)证明大规模资产购买(LSAPs)在应对这些收缩方面的有效性。关键机制源于异质风险承受能力:当衰退冲击冲击经济并拉低资产价格时,风险承受能力代理人的财富份额下降,其杠杆率内生上升。这降低了市场的风险承受能力,并对资产价格和总需求产生下行压力。当货币政策不受约束时,它可以通过提高市场夏普比率的降息来抵消风险承受能力的下降。然而,如果利率政策受到约束,就会出现新的收缩反馈:衰退冲击导致资产价格和产出进一步下降,从而引发避险事件并引发下行循环。在这种情况下,LSAPs通过将风险转移到政府的资产负债表来改善资产价格和总需求,从而降低了市场所需的夏普比率。当(合并后的)政府拥有更大的未来财政能力,且下行螺旋更严重时,最优LSAPs就更大。此外,我们还展示了企业债务积压问题如何强化我们的机制。2019冠状病毒病的冲击以及所有主要央行的大规模反应,生动地说明了我们试图捕捉的环境。
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引用次数: 16
Measuring Welfare and Inequality with Incomplete Price Information 用不完全价格信息衡量福利与不平等
Pub Date : 2020-03-01 DOI: 10.3386/w26890
D. Atkin, Benjamin Faber, Thibault Fally, Marco Gonzalez-Navarro
Measuring changes in welfare, and particularly the price index, is challenging in the absence of well-measured prices covering the entire consumption basket. We propose and implement a new approach to estimate changes in income-group specific price indices and welfare using rich, but widely available, expenditure survey microdata. We build on existing work that uses Engel curves and expenditures on income-elastic goods to infer real incomes. While based on non-homothetic preferences, the price indices this approach recovers are homothetic and hence are neither theory consistent nor suitable for distributional analysis. We show that we can recover income-specific price index and welfare changes from horizontal shifts in Engel curves if preferences are quasi-separable and we focus on "relative" Engel curves. Our approach is flexible enough to allow for the non-linear Engel curves we document in the data, and for non-parametric estimation at each point of the income distribution. We implement this approach to estimate inflation and welfare in rural India between 1987/1988 and 1999/2000, and to revisit the impacts of India's trade reforms. Our estimates reveal that lower inflation rates for the rich erased the real income convergence documented by the existing literature that calculates inflation using only well-measured prices.
在缺乏涵盖整个消费篮子的良好衡量价格的情况下,衡量福利的变化,尤其是价格指数,是一项挑战。我们提出并实施了一种新的方法,利用丰富但广泛可用的支出调查微观数据来估计收入群体特定价格指数和福利的变化。我们以现有工作为基础,使用恩格尔曲线和收入弹性商品的支出来推断实际收入。虽然基于非同质偏好,但这种方法恢复的价格指数是同质的,因此既不符合理论,也不适合进行分布分析。我们表明,如果偏好是准可分的,我们可以从恩格尔曲线的水平移动中恢复收入特定价格指数和福利变化,并且我们关注“相对”恩格尔曲线。我们的方法足够灵活,可以考虑我们在数据中记录的非线性恩格尔曲线,以及收入分布的每个点的非参数估计。我们采用这种方法来估计1987/1988年至1999/2000年间印度农村的通货膨胀和福利,并重新审视印度贸易改革的影响。我们的估计表明,富人较低的通货膨胀率抹去了现有文献记录的实际收入收敛,这些文献只使用精确测量的价格来计算通货膨胀。
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引用次数: 8
Language Training and Refugees' Integration 语言培训与难民融入
Pub Date : 2020-03-01 DOI: 10.3386/w26834
J. Arendt, Iben Bolvig, M. Foged, Linea Hasager, G. Peri
Social and economic integration of refugees are key to their personal fulfillment and to producing positive effects in the host country. We evaluate the impact of a reform that expanded and improved early language classes to refugees in Denmark while also temporarily lowering welfare benefits for a subgroup of them. The policy change applied to those who obtained refugee status in Denmark on or after January 1, 1999. Using a regression discontinuity design around the cutoff date we find that employment and earnings gradually diverged for the treated group after completion of the language program. The effect was significant and resulted in four percentage points permanently higher employment and almost USD 2,510 in extra yearly earnings over eighteen years. We do not find temporary or permanent labor market effects of cutting welfare benefits, but we find evidence of temporarily higher property crime when refugees received lower benefits. We also find that children of refugees who received enhanced language classes were more likely to complete lower secondary school and less likely to commit crime.
难民融入社会和经济是他们实现个人目标和在东道国产生积极影响的关键。我们评估了一项改革的影响,该改革扩大和改善了丹麦难民的早期语言课程,同时暂时降低了他们中的一小部分人的福利待遇。这一政策变化适用于1999年1月1日或之后在丹麦获得难民身份的人。在截止日期前后使用回归不连续设计,我们发现在完成语言课程后,治疗组的就业和收入逐渐分化。效果非常显著,在18年的时间里,就业率永久性提高了4个百分点,年收入增加了近2510美元。我们没有发现削减福利对劳动力市场产生暂时或永久的影响,但我们发现,当难民获得较低的福利时,财产犯罪会暂时增加。我们还发现,接受强化语言课程的难民儿童完成初中学业的可能性更大,犯罪的可能性更小。
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引用次数: 25
Global Effects of the Brexit Referendum: Evidence from US Corporations 英国脱欧公投的全球影响:来自美国企业的证据
Pub Date : 2020-01-30 DOI: 10.3386/w26714
Murillo Campello, Gustavo S. Cortés, Fabrício d'Almeida, Gaurav Kankanhalli
We show that the 2016 Brexit Referendum led American corporations to cut jobs and investment within US borders. Using establishment-level data, we document that these effects were modulated by the degree of reversibility of capital and labor. American job losses were particularly pronounced in industries with less skilled and more unionized workers. UK-exposed firms with less redeployable capital and high input-offshoring dependence cut investment the most. Data on the near-universe of US establishments also point to measurable, negative effects on establishment turnover (openings and closings). Our results demonstrate how foreign-born political uncertainty is transmitted across international borders, shaping domestic capital formation and labor allocation.
我们表明,2016年英国脱欧公投导致美国企业在美国境内削减就业和投资。利用企业层面的数据,我们证明这些影响是由资本和劳动力的可逆性程度调节的。美国的失业情况在工人技能较低、工会化程度较高的行业尤为明显。在英国,可重新配置资本较少、对离岸投入依赖程度高的公司削减投资最多。关于美国几乎所有机构的数据也表明,对机构周转率(新开和关闭)产生了可衡量的负面影响。我们的研究结果表明,外国出生的政治不确定性如何跨越国界,影响国内资本形成和劳动力配置。
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引用次数: 25
期刊
National Bureau of Economic Research
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