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Do Experts' SKU Forecasts Improve after Feedback? 专家的SKU预测在反馈后会提高吗?
Pub Date : 2011-09-22 DOI: 10.2139/ssrn.1934120
Rianne Legerstee, P. Franses
We analyze the behavior of experts who quote forecasts for monthly SKU-level sales data where we compare data before and after the moment that experts received different kinds of feedback on their behavior. We have data for 21 experts located in as many countries who make SKUlevel forecasts for a variety of pharmaceutical products for October 2006 to September 2007. We study the behavior of the experts by comparing their forecasts with those from an automated statistical program, and we report the forecast accuracy over these 12 months. In September 2007 these experts were given feedback on their behavior and they received a training at the headquarters' office, where specific attention was given to the ins and outs of the statistical program. Next, we study the behavior of the experts for the 3 months after the training session, that is, October 2007 to December 2007. Our main conclusion is that in the second period the experts' forecasts deviated less from the statistical forecasts and that their accuracy improved substantially.
我们分析那些引用每月sku级销售数据预测的专家的行为,在那里我们比较专家收到不同类型的行为反馈之前和之后的数据。我们有21位专家的数据,他们分布在许多国家,对2006年10月至2007年9月的各种药品进行SKUlevel预测。我们通过将专家的预测与自动统计程序的预测进行比较来研究专家的行为,并报告这12个月的预测准确性。2007年9月,这些专家得到了关于他们行为的反馈,并在总部办公室接受了培训,在那里他们特别关注统计项目的来龙去路。接下来,我们研究了训练结束后3个月的专家行为,即2007年10月至2007年12月。我们的主要结论是,在第二个时期,专家预测与统计预测的偏差较小,其准确性大大提高。
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引用次数: 11
Social Interactions in the Labor Market 劳动力市场中的社会互动
Pub Date : 2011-09-22 DOI: 10.1561/0700000045
Andrew Grodner, T. Kniesner, J. Bishop
We examine theoretically and empirically social interactions in labor markets and how policy prescriptions can change dramatically when there are social interactions present. Spillover effects increase labor supply and conformity effects make labor supply perfectly inelastic at a reference group average. The demand for a good may also be influenced by either a spillover effect or a conformity effect. Positive spillover increases the demand for the good with interactions, and a conformity effect makes the demand curve pivot to become less price sensitive. Similar social interactions effects appear in the associated derived demands for labor. Individual and community factors may influence the average length of poverty spells. We measure local economic conditions by the county unemployment rate and neighborhood spillover effects by the racial makeup and poverty rate of the county. We find that moving an individual from one standard deviation above the mean poverty rate to one standard deviation below the mean poverty rate (from the inner city to the suburbs) lowers the average poverty spell by 20–25 percent. We further consider overall labor market outcomes by examining theoretically the socially optimal wealth distribution. Interdependence in utility can mitigate the need to transfer wealth to low-wage individuals and may require them to be poorer by all objective measures. Finally, we quantify how labor market policy changes when there are household social interactions. Labor supply estimates indicate positive economically important spillovers for adult U.S. men. Ignoring or incorrectly considering social interactions can mis-estimate the labor supply response of tax reform in the United States by as much as 60 percent.
我们从理论上和经验上考察了劳动力市场中的社会互动,以及当存在社会互动时,政策处方如何发生巨大变化。溢出效应使劳动力供给增加,整合效应使劳动力供给在参考群体平均水平上完全无弹性。对一种商品的需求也可能受到溢出效应或一致性效应的影响。正向溢出效应增加了对具有交互作用的商品的需求,整合效应使需求曲线枢轴变得对价格不那么敏感。类似的社会互动效应也出现在相关的劳动需求中。个人和社区因素可能影响贫困期的平均长度。我们通过县失业率来衡量当地经济状况,并通过县的种族构成和贫困率来衡量社区溢出效应。我们发现,把一个人从高于平均贫困率一个标准差的地方搬到低于平均贫困率一个标准差的地方(从内城搬到郊区),平均贫困率会降低20 - 25%。我们进一步通过理论上检验社会最优财富分配来考虑整体劳动力市场的结果。效用上的相互依赖可以减轻向低工资个人转移财富的需要,并可能要求他们以所有客观标准衡量更穷。最后,我们量化了当存在家庭社会互动时劳动力市场政策的变化。劳动力供给估计表明,这对美国成年男性具有积极的经济溢出效应。在美国,忽视或错误地考虑社会互动可能会对税收改革的劳动力供给反应产生多达60%的错误估计。
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引用次数: 13
Corporate Taxation, Investment and Productivity: A Firm Level Estimation 企业税收、投资和生产率:一个企业水平的估计
Pub Date : 2011-09-15 DOI: 10.2139/ssrn.1636044
Cristina Pombo, A. Galindo
This paper analyses how corporate taxes can affect investment and productivity. To address this question the paper uses data from a set of 42 developing countries taken from the World Bank Business Environment Surveys and examines whether firms with different sizes are affected differently by taxation. We extend the analysis that has been carried out relating tax rates to investment into the analysis of the impact of taxation on total factor productivity. Investment and productivity are shown to respond negatively to an increase in the corporate tax rate. These effects are stronger in bigger firms.
本文分析了公司税如何影响投资和生产率。为了解决这个问题,本文使用了来自世界银行商业环境调查中42个发展中国家的数据,并检验了不同规模的公司是否受到税收的不同影响。我们将已经进行的有关税率与投资的分析扩展到税收对全要素生产率影响的分析。投资和生产率对企业税率的提高反应消极。这些影响在大公司中更为强烈。
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引用次数: 18
Rising Indebtedness and Temptation: A Welfare Analysis 负债上升与诱惑:福利分析
Pub Date : 2011-09-14 DOI: 10.2139/ssrn.1927524
M. Nakajima
Is the observed large increase in consumer indebtedness since 1970 beneficial for U.S. consumers? This paper quantitatively investigates the macroeconomic and welfare implications of relaxing borrowing constraints using a model with preferences featuring temptation and self-control. The model can capture two contrasting views: the positive view, which links increased indebtedness to financial innovation and thus better consumption smoothing, and the negative view, which is associated with consumers' over-borrowing. The author finds that the latter is sizable: the calibrated model implies a social welfare loss equivalent to a 0.4 percent decrease in per-period consumption from the relaxed borrowing constraint consistent with the observed increase in indebtedness. The welfare implication is strikingly different from the standard model without temptation, which implies a welfare gain of 0.7 percent, even though the two models are observationally similar. Naturally, the optimal level of the borrowing limit is significantly tighter according to the temptation model, as a tighter borrowing limit helps consumers by preventing over-borrowing.
自1970年以来观察到的消费者债务的大幅增加对美国消费者有利吗?本文使用一个具有诱惑和自我控制的偏好模型,定量地研究了放松借贷约束的宏观经济和福利影响。该模型可以捕捉到两种截然不同的观点:积极观点,将债务增加与金融创新联系起来,从而更好地平滑消费;消极观点,与消费者过度借贷有关。作者发现后者是相当可观的:经过校准的模型表明,与观察到的债务增加相一致,借贷约束放松导致的社会福利损失相当于每期消费减少0.4%。福利含义与没有诱惑的标准模型截然不同,后者意味着0.7%的福利收益,尽管这两个模型在观察上相似。自然,根据诱惑模型,借款限额的最优水平明显收紧,因为更严格的借款限额有助于防止消费者过度借贷。
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引用次数: 32
Current Account Imbalances in the Euro Area: The Role of Monetary Policy 欧元区经常账户失衡:货币政策的作用
Pub Date : 2011-09-12 DOI: 10.2139/ssrn.1926062
Katja Hillmann, W. Wilde
This paper provides an alternative approach in explaining current account imbalances within the euro area. The inability of the ECB to react to disparities in inflation and economic growth between EMU members results in persistent real interest rate differentials, which in turn cause divergent current accounts among EMU member states. Using Taylor rules we assess an optimal interest rate for each EMU member separately. The deviation between realized euro and optimal country-specificc interest rate, employed in a panel estimation, exhibits a significantly strong impact on current account imbalances and proves to be robust to various specifications.
本文提供了另一种解释欧元区经常账户失衡的方法。欧洲央行无力对欧洲货币联盟成员国之间的通胀和经济增长差异做出反应,导致实际利率持续存在差异,进而导致欧洲货币联盟成员国之间经常账户的差异。使用泰勒规则,我们分别评估每个欧洲货币联盟成员国的最优利率。在面板估计中采用的欧元实际利率与特定国家最优c利率之间的偏差,对经常账户失衡表现出显着的强烈影响,并证明对各种规格都具有稳健性。
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引用次数: 1
Conflict and Its Impact on Educational Accumulation and Enrollment in Colombia: What We Can Learn from Recent IDPs 冲突及其对哥伦比亚教育积累和入学的影响:我们可以从最近的国内流离失所者中学到什么
Pub Date : 2011-09-04 DOI: 10.2139/ssrn.1922011
Kate Wharton, Ruth Uwaifo Oyelere
Forty years of low-intensity internal armed conflict has made Colombia home to the world's second largest population of Internally Displaced Persons (IDPs). The effect of being directly impacted by conflict on a child's educational accumulation and enrollment is of particular concern because of the critical role that education plays in increasing human capital and productivity. This paper explores the educational accumulation and enrollment gap created by being directly affected by conflict. First, we show that children living in municipality with high conflict have a gap in education enrollment and accumulation. However, this gap is much smaller than the attainment and enrollment gap for those directly affected by the conflict (IDPs). We estimate the education accumulation and enrollment gaps for IDPs in comparison to non-migrants and other migrants respectively. Our results suggest significant education accumulation and enrollment gaps for children of IDPs that widens to over half a year in secondary school. The disparity in effects when we focus on direct exposure to conflict versus living in a municipality with conflict suggests a need to be careful when using the latter to estimate the impact of conflict.
四十年的低强度国内武装冲突使哥伦比亚成为世界上国内流离失所者人数第二多的国家。由于教育在提高人力资本和生产力方面发挥着关键作用,因此受到冲突直接影响对儿童教育积累和入学的影响尤其令人担忧。本文探讨了受冲突直接影响而产生的教育积累和招生差距。首先,我们发现高冲突城市的儿童在入学率和教育积累方面存在差距。然而,这一差距远远小于直接受冲突影响的人(国内流离失所者)的学业和入学差距。我们分别估算了国内流离失所者与非移民和其他移民相比的教育积累和入学差距。我们的研究结果表明,国内流离失所者儿童的教育积累和入学差距显著,在中学阶段扩大到半年以上。当我们关注直接接触冲突与生活在有冲突的城市时,影响的差异表明,在使用后者来估计冲突的影响时,需要谨慎。
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引用次数: 14
CEO Compensation Structure and Firm Performance CEO薪酬结构与公司绩效
Pub Date : 2011-09-01 DOI: 10.1111/j.1467-629X.2010.00363.x
Z. Matolcsy, Anna Wright
The relation between CEO compensation and firm performance has been extensively documented in the literature to date. However, this relation has not been explored in a setting where CEO's, even in the same industry, receive either cash-based compensation only or cash-based and equity-based compensation. Australia provides such a setting. Our objective is twofold. First, we provide evidence on the performance of firms where CEO's receive cash-based compensation only versus the performance of firms where executives received equity-based compensation. Second, we estimate a model of 'efficient' compensation structure on the basis of firm characteristics, and test the performance consequences of deviation from the efficient compensation structure. Our results are based on 696 firm years for the period of 1999-2001. We have two key findings. First, we show that on average, firm performance does not differ between firms offering cash-based compensation only and those using both cash- and equity-based compensation. Second, we find some evidence that a firm's performance is lower when a firm is using the 'wrong' compensation structure. We test the sensitivity results with respect to alternative sub-samples and variable specifications, but our results remain the same. Overall, our study provides some important new insight into the links between CEO compensation and firm performance.
CEO薪酬与公司绩效之间的关系在迄今为止的文献中得到了广泛的记录。然而,这种关系并没有在CEO(即使在同一行业)要么只接受现金薪酬,要么接受现金和股权薪酬的情况下进行探讨。澳大利亚提供了这样的环境。我们的目标是双重的。首先,我们提供了CEO只接受现金薪酬的公司与高管接受股权薪酬的公司业绩的证据。其次,我们根据企业特征估计了一个“有效”薪酬结构模型,并检验了偏离有效薪酬结构的绩效后果。我们的结果基于1999-2001年期间的696个固定年份。我们有两个主要发现。首先,我们表明,平均而言,仅提供现金薪酬的公司与同时使用现金和股权薪酬的公司之间的公司绩效并没有差异。其次,我们发现一些证据表明,当公司使用“错误的”薪酬结构时,公司的绩效会降低。我们测试了相对于备选子样本和可变规格的灵敏度结果,但我们的结果保持不变。总的来说,我们的研究为CEO薪酬与公司绩效之间的联系提供了一些重要的新见解。
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引用次数: 97
Assessing Post‐ADA Employment: Some Econometric Evidence and Policy Considerations 评估《美国残疾人法》后的就业:一些计量经济学证据和政策考虑
Pub Date : 2011-09-01 DOI: 10.1111/j.1740-1461.2011.01217.x
J. Donohue, M. Stein, Christopher L. Griffin, Jr., Sascha S. Becker
In this article, we offer innovative analysis and additional evidence on the relationship between the Americans with Disabilities Act ("ADA") and the relative labor market outcomes for people with disabilities, the very class protected by its landmark provisions. Using individual-level longitudinal data from 1981 to 1996 derived from the previously unexploited Panel Study of Income Dynamics ("PSID"), we examine the possible effect of the ADA on (1) annual weeks worked; (2) annual earnings; and (3) hourly wages for a sample of 7120 unique male household heads between the ages of 21 and 65 as well as a subset of 1147 individuals appearing every year from 1981 to 1996. Our analysis of the larger sample suggests the ADA had a negative impact on the employment levels of disabled persons relative to non-disabled persons but no impact on relative earnings. However, our evaluation of the restricted sample raises questions about these findings. Using these data, we find little evidence of adverse effects on weeks worked but strong evidence of wage declines for the disabled, albeit declines beginning in 1986, well before the ADA's passage. These results therefore cast doubt on the adverse ADA-related impacts found in previous studies, particularly Acemoglu and Angrist (2001). The conflicting narratives that emerge from our analysis shed new light on, but also counsel caution in reaching final conclusions about, the impact of the ADA on employment outcomes for people with disabilities.
在本文中,我们对《美国残疾人法案》(ADA)与残疾人的相对劳动力市场结果之间的关系进行了创新分析,并提供了额外的证据,而残疾人正是受其具有里程碑意义的条款保护的群体。利用1981年至1996年的个人纵向数据,我们研究了《美国残疾人法》对(1)年工作周数的可能影响;(二)年度收益;(3) 1981年至1996年,7120名年龄在21岁至65岁之间的男性户主以及每年出现的1147名个体的小时工资。我们对更大样本的分析表明,相对于非残疾人,《美国残疾人法》对残疾人的就业水平有负面影响,但对相对收入没有影响。然而,我们对有限样本的评估对这些发现提出了质疑。通过这些数据,我们发现几乎没有证据表明对工作周的不利影响,但有强有力的证据表明残疾人的工资下降,尽管下降始于1986年,早在《美国残疾人法》通过之前。因此,这些结果对以前的研究,特别是Acemoglu和Angrist(2001)中发现的与ada相关的不利影响提出了质疑。从我们的分析中出现的相互矛盾的叙述为《美国残疾人法》对残疾人就业结果的影响提供了新的线索,但也提醒我们在得出最终结论时要谨慎。
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引用次数: 19
Trade Intermediation and the Organization of Exporters 贸易中介和出口商组织
Pub Date : 2011-09-01 DOI: 10.1111/j.1467-9396.2011.00971.x
Gabriel Felbermayr, B. Jung
The business literature and recent descriptive evidence show that exporting rms typically require the help of foreign trade intermediaries or need to set up own foreign wholesale aliates. In contrast, conventional trade theory models assume that producers can directly access foreign consumers. This paper introduces intermediaries in an international trade model where producers dier with respect to productivity as well as regarding their varieties’ perceived quality and tradability. We assume that trade intermediation is prone to frictions due to the absence of enforceable cross-country contracts while own wholesale subsidiaries require capital investment. We derive the sorting pattern of rms according to their degree of competitive advantage and show how the relative prevalence of intermediation depends on the degree of heterogeneity among producers, on the importance of market-specicity of goods, or on expropriation risk. We use US export data for 50 sectors and 133 destination countries to check the empirical validity of this predictions and nd robust empirical support.
商业文献和最近的描述性证据表明,出口企业通常需要外贸中介机构的帮助,或者需要建立自己的国外批发分公司。相比之下,传统的贸易理论模型假设生产者可以直接接触到外国消费者。本文介绍了一个国际贸易模型中的中间商,在这个模型中,生产者既考虑生产率,也考虑品种的感知质量和可贸易性。我们假设贸易中介容易发生摩擦,因为缺乏可执行的跨国合同,而自己的批发子公司需要资本投资。我们根据rms的竞争优势程度推导出rms的分类模式,并展示了中介的相对流行程度如何取决于生产者之间的异质性程度、商品的市场特异性的重要性或征用风险。我们使用美国50个行业和133个目的地国家的出口数据来检验这一预测的实证有效性和强有力的实证支持。
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引用次数: 121
Means-Tested Subsidies and Economic Performance Since 2007 自2007年以来的经济状况调查补贴和经济表现
Pub Date : 2011-09-01 DOI: 10.3386/W17445
C. Mulligan
The aggregate neoclassical growth model - with means-tested subsidies whose replacement rates began rising at the end of 2007 as its only impulse - produces time series for aggregate labor usage, consumption, investment, and real GDP that closely resemble actual U.S. time series. Despite having no explicit financial market, the model has investment fall steeply during the recession not because of any distortions with the supply of capital, but merely because labor is falling and labor is complementary with capital in the production function. Through the lens of the model, the fact that real consumption fell significantly below trend during 2008 suggests that labor usage per capita is expected to remain well below pre-recession levels for several years.
总的新古典增长模型——以经济状况调查补贴(其替代率在2007年底开始上升)作为唯一的推动力——产生了与美国实际时间序列非常相似的总劳动力使用、消费、投资和实际GDP的时间序列。尽管没有明确的金融市场,但该模型认为,在经济衰退期间,投资急剧下降并不是因为资本供给的扭曲,而仅仅是因为劳动力在下降,而劳动力在生产函数中与资本是互补的。从模型的角度来看,2008年实际消费明显低于趋势水平的事实表明,人均劳动力使用量预计将在未来几年保持在远低于衰退前水平的水平。
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引用次数: 7
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