首页 > 最新文献

Journal of Benefit-Cost Analysis最新文献

英文 中文
Ex Ante Costs Versus Ex Post Costs of the Large Municipal Waste Combustor Rule 大型城市垃圾焚烧炉规则的事前成本与事后成本之比较
IF 3.4 4区 经济学 Q2 ECONOMICS Pub Date : 2023-08-07 DOI: 10.1017/bca.2023.16
Cynthia L. Morgan, Carl Pasurka
This article compares the U.S. Environmental Protection Agency’s (EPA) ex ante cost analysis of its 1995 Large Municipal Waste Combustor (MWC): New Source Performance Standards and Emissions Guidelines rule to an ex post assessment of its cost. Unlike many retrospective cost analyses, where ex post assessments are limited due to lack of data on compliance costs, this case study is unique because we located and used plant-level survey data from the U.S. Department of Energy and Governmental Advisory Associates in a comparison of ex ante and ex post costs of individual MWCs. We find the ex post capital expenditures for nitrogen oxide control systems are typically lower than the EPA ex ante estimates, while the ex post capital expenditures for mercury control systems tend to be higher than the EPA ex ante estimates. Finally, while we find a few outliers, the average ratio of ex post to ex ante capital expenditures for particulate matter and sulfur dioxide emissions control is near unity.
本文比较了美国环境保护署(EPA)对其1995年大型城市垃圾焚烧炉(MWC)的事前成本分析:新源性能标准和排放指南规则与事后成本评估。与许多回顾性成本分析不同,由于缺乏合规成本数据,事后评估受到限制,本案例研究的独特之处在于,我们找到并使用了来自美国能源部和政府咨询协会的工厂级调查数据,对单个mwc的事前和事后成本进行了比较。我们发现氮氧化物控制系统的事后资本支出通常低于EPA的事前估计,而汞控制系统的事后资本支出往往高于EPA的事前估计。最后,虽然我们发现了一些异常值,但颗粒物和二氧化硫排放控制的事后和事前资本支出的平均比率几乎是一致的。
{"title":"Ex Ante Costs Versus Ex Post Costs of the Large Municipal Waste Combustor Rule","authors":"Cynthia L. Morgan, Carl Pasurka","doi":"10.1017/bca.2023.16","DOIUrl":"https://doi.org/10.1017/bca.2023.16","url":null,"abstract":"\u0000 This article compares the U.S. Environmental Protection Agency’s (EPA) ex ante cost analysis of its 1995 Large Municipal Waste Combustor (MWC): New Source Performance Standards and Emissions Guidelines rule to an ex post assessment of its cost. Unlike many retrospective cost analyses, where ex post assessments are limited due to lack of data on compliance costs, this case study is unique because we located and used plant-level survey data from the U.S. Department of Energy and Governmental Advisory Associates in a comparison of ex ante and ex post costs of individual MWCs. We find the ex post capital expenditures for nitrogen oxide control systems are typically lower than the EPA ex ante estimates, while the ex post capital expenditures for mercury control systems tend to be higher than the EPA ex ante estimates. Finally, while we find a few outliers, the average ratio of ex post to ex ante capital expenditures for particulate matter and sulfur dioxide emissions control is near unity.","PeriodicalId":45587,"journal":{"name":"Journal of Benefit-Cost Analysis","volume":"14 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2023-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90978702","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"经济学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Distribution and Disputation: Net Benefits, Equity, and Public Decision-Making 分配与争议:净收益、公平和公共决策
IF 3.4 4区 经济学 Q2 ECONOMICS Pub Date : 2023-07-19 DOI: 10.1017/bca.2023.30
H. Banzhaf
Abstract As its practitioners know well, benefit-cost analysis (BCA) walks a fine line between the positive and normative, between the science of economics and the art of political economy. Missteps threaten to undermine its credibility as a value-free science, while overcaution risks irrelevance to the pressing questions of the day. As BCA adapts to give more weight to distributional concerns, while operating in a more highly charged political environment than ever before, these tensions will only grow. For perspective, I reexamine three prominent episodes in the history of economics where these issues were vigorously debated: (i) The founding of the NBER by Wesley Clair Mitchell, who insisted that the organization eschew all policy recommendations; (ii) the introduction of the modern definition of economics as the study of tradeoffs by Lionel Robbins, who insisted welfare effects could never be aggregated; and (iii) the origins of BCA as a measure of income, which to first-generation practitioners seemed to foreclose the possibility of measuring “intangible” benefits like recreation opportunities, mortality risks, and equity. These episodes, together with critiques of economics from philosophers of science, suggest we are best served by being as transparent as possible about the ways values influence BCA reasoning, without arrogating political decisions into it.
摘要 实践者都知道,效益成本分析(BCA)在积极与规范、经济科学与政治经济艺术之间游走。失误有可能损害其作为无价值科学的可信度,而过度谨慎则有可能与当今的紧迫问题无关。随着《巴塞尔公约》在比以往任何时候都更加高度紧张的政治环境中运作,对分配问题给予更多重视,这些紧张关系只会加剧。为便于理解,我重新审视了经济学史上就这些问题展开激烈辩论的三个重要事件:(i) 韦斯利-克莱尔-米切尔(Wesley Clair Mitchell)创立 NBER,他坚持认为该组织应摒弃所有政策建议;(ii) 莱昂内尔-罗宾斯(Lionel Robbins)将经济学的现代定义引入权衡研究,他坚持认为福利效应永远无法汇总;(iii) BCA 起源于对收入的衡量,对第一代从业者而言,这似乎排除了衡量娱乐机会、死亡风险和公平等 "无形 "收益的可能性。这些事件以及科学哲学家对经济学的批判表明,我们最好的办法是尽可能透明地了解价值观如何影响BCA推理,而不要将政治决策掺杂其中。
{"title":"Distribution and Disputation: Net Benefits, Equity, and Public Decision-Making","authors":"H. Banzhaf","doi":"10.1017/bca.2023.30","DOIUrl":"https://doi.org/10.1017/bca.2023.30","url":null,"abstract":"Abstract As its practitioners know well, benefit-cost analysis (BCA) walks a fine line between the positive and normative, between the science of economics and the art of political economy. Missteps threaten to undermine its credibility as a value-free science, while overcaution risks irrelevance to the pressing questions of the day. As BCA adapts to give more weight to distributional concerns, while operating in a more highly charged political environment than ever before, these tensions will only grow. For perspective, I reexamine three prominent episodes in the history of economics where these issues were vigorously debated: (i) The founding of the NBER by Wesley Clair Mitchell, who insisted that the organization eschew all policy recommendations; (ii) the introduction of the modern definition of economics as the study of tradeoffs by Lionel Robbins, who insisted welfare effects could never be aggregated; and (iii) the origins of BCA as a measure of income, which to first-generation practitioners seemed to foreclose the possibility of measuring “intangible” benefits like recreation opportunities, mortality risks, and equity. These episodes, together with critiques of economics from philosophers of science, suggest we are best served by being as transparent as possible about the ways values influence BCA reasoning, without arrogating political decisions into it.","PeriodicalId":45587,"journal":{"name":"Journal of Benefit-Cost Analysis","volume":"8 1","pages":"205 - 229"},"PeriodicalIF":3.4,"publicationDate":"2023-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139357803","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"经济学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Benefit–Cost Analysis of Increased Trade: An Order-of-Magnitude Estimate of the Benefit–Cost Ratio 贸易增长的效益-成本分析:效益-成本比的数量级估计
IF 3.4 4区 经济学 Q2 ECONOMICS Pub Date : 2023-07-13 DOI: 10.1017/bca.2023.12
James D. Feyrer, Vladimir Tyazhelnikov, Benjamin Aleman-Castilla, Brad Wong
Drawing upon recent studies that empirically estimate both the benefits and costs of trade, this paper addresses a simple and important question: By how much do the benefits of increased global trade outweigh the costs? To the best of our knowledge, this is the first attempt to answer this question at global and World Bank income-grouping levels using empirically estimated relationships from the trade cost literature. Using a structural gravity model, we simulate changes in three primary trade constraints: a 10% reduction in tariff levels, a 10% reduction in effective distance, and a 10% increase in free trade agreement depth. The projection leads to a roughly 5% increase in global trade by value. Our model suggests that increased trade has an incredibly high benefit–cost ratio (BCR) for the developing world with an order-of-magnitude estimate for low- and lower–middle-income countries of 100 and for upper–middle-income countries of 50. However, the BCR for high-income countries is substantially lower, with a value closer to 5. Overall, the results suggest that free trade leads to substantial net benefits globally, generating US$ 700 billion in benefits (0.83% of global GDP) and US$ 100 billion in costs (0.12% of global GDP) in the first year, a differential that grows over time. Sensitivity analyses suggest that our BCRs are on the lower end of a plausible range. The results point to the incredible value of free trade, particularly for developing countries, and reiterate the importance of considering distributional impacts when implementing trade reforms.
根据最近的研究,实证地估计了贸易的收益和成本,本文解决了一个简单而重要的问题:全球贸易增长的收益比成本高出多少?据我们所知,这是第一次尝试在全球和世界银行的收入分组水平上,利用贸易成本文献中经验估计的关系来回答这个问题。利用结构重力模型,我们模拟了三个主要贸易约束的变化:关税水平降低10%,有效距离减少10%,自由贸易协定深度增加10%。这一预测将导致全球贸易额增长约5%。我们的模型表明,贸易增长对发展中国家具有令人难以置信的高效益成本比(BCR),对中低收入国家和中高收入国家的效益成本比估计为100,对中高收入国家的效益成本比估计为50。然而,高收入国家的BCR要低得多,接近5。总体而言,研究结果表明,自由贸易在全球范围内带来了巨大的净效益,第一年产生了7000亿美元的效益(占全球GDP的0.83%)和1000亿美元的成本(占全球GDP的0.12%),这一差异随着时间的推移而扩大。敏感性分析表明,我们的bcr处于一个合理范围的低端。研究结果指出了自由贸易的巨大价值,尤其是对发展中国家而言,并重申了在实施贸易改革时考虑分配影响的重要性。
{"title":"Benefit–Cost Analysis of Increased Trade: An Order-of-Magnitude Estimate of the Benefit–Cost Ratio","authors":"James D. Feyrer, Vladimir Tyazhelnikov, Benjamin Aleman-Castilla, Brad Wong","doi":"10.1017/bca.2023.12","DOIUrl":"https://doi.org/10.1017/bca.2023.12","url":null,"abstract":"\u0000 Drawing upon recent studies that empirically estimate both the benefits and costs of trade, this paper addresses a simple and important question: By how much do the benefits of increased global trade outweigh the costs? To the best of our knowledge, this is the first attempt to answer this question at global and World Bank income-grouping levels using empirically estimated relationships from the trade cost literature. Using a structural gravity model, we simulate changes in three primary trade constraints: a 10% reduction in tariff levels, a 10% reduction in effective distance, and a 10% increase in free trade agreement depth. The projection leads to a roughly 5% increase in global trade by value. Our model suggests that increased trade has an incredibly high benefit–cost ratio (BCR) for the developing world with an order-of-magnitude estimate for low- and lower–middle-income countries of 100 and for upper–middle-income countries of 50. However, the BCR for high-income countries is substantially lower, with a value closer to 5. Overall, the results suggest that free trade leads to substantial net benefits globally, generating US$ 700 billion in benefits (0.83% of global GDP) and US$ 100 billion in costs (0.12% of global GDP) in the first year, a differential that grows over time. Sensitivity analyses suggest that our BCRs are on the lower end of a plausible range. The results point to the incredible value of free trade, particularly for developing countries, and reiterate the importance of considering distributional impacts when implementing trade reforms.","PeriodicalId":45587,"journal":{"name":"Journal of Benefit-Cost Analysis","volume":"30 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2023-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77845478","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"经济学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Best Investments in Chronic, Noncommunicable Disease Prevention and Control in Low- and Lower–Middle-Income Countries 低收入和中低收入国家对慢性非传染性疾病预防和控制的最佳投资
IF 3.4 4区 经济学 Q2 ECONOMICS Pub Date : 2023-07-13 DOI: 10.1017/bca.2023.25
David Watkins, S. Ahmed, Sarah J. Pickersgill, Saleema Razvi
The world remains off-track for the sustainable development goal (SDG) target 3.4, which calls for a one-third reduction in noncommunicable diseases (NCDs) mortality by 2030. This paper presents benefit–cost analyses of various NCD interventions in low-income (LICs) and lower–middle-income (LMCs) countries. We looked at 30 interventions recommended by the Disease Control Priorities Project, including six intersectoral policies (e.g., taxes) and 24 clinical services. We used a previously published model to estimate intervention costs and benefits through 2030, discounted at 8%. We focused on interventions with benefit–cost ratios (BCRs) > 15 and their contribution toward achieving the SDG target. We found that intersectoral policies often provided great value for money, with BCRs ranging from 40 (trans-fat bans) to 100 (tobacco excise taxes). However, seven clinical interventions (e.g., basic treatment of cardiovascular disease or breast cancer) also had BCRs > 15. The overall population impact of clinical interventions over the 2023–2030 period would be much higher than that of the intersectoral policies, which can take many years to reach their peak effects. Fully implementing the best-investment interventions would accelerate progress toward SDG 3.4 everywhere, but only one in 10 countries would achieve the target. This strategy would require an additional US$ 2.4 billion annually across all LICs and LMCs. We conclude that there are several cost-beneficial opportunities to tackle NCDs in LICs and LMCs. In countries with very limited resources, the best-investment interventions could begin to address the major NCD risk factors and build greater health system capacity, with benefits continuing to accrue beyond 2030.
世界仍未走上可持续发展目标具体目标3.4的轨道,该目标要求到2030年将非传染性疾病死亡率降低三分之一。本文介绍了低收入和中低收入国家各种非传染性疾病干预措施的收益-成本分析。我们研究了疾病控制优先项目建议的30项干预措施,包括6项跨部门政策(如税收)和24项临床服务。我们使用先前发表的模型来估计到2030年的干预成本和收益,折现率为8%。我们重点研究了效益成本比(bcr) > 15的干预措施及其对实现可持续发展目标的贡献。我们发现,跨部门政策往往物有所值,bcr从40(反式脂肪禁令)到100(烟草消费税)不等。然而,7项临床干预措施(如心血管疾病或乳腺癌的基础治疗)的bcr也大于15。在2023-2030年期间,临床干预措施对总体人口的影响将远远高于跨部门政策,后者可能需要多年时间才能达到其峰值效果。全面实施最佳投资干预措施将加速各地实现可持续发展目标3.4的进程,但只有十分之一的国家能够实现这一目标。这一战略将需要在所有低收入国家和低收入国家每年额外投入24亿美元。我们的结论是,在低收入国家和低收入国家,应对非传染性疾病存在一些具有成本效益的机会。在资源非常有限的国家,最佳投资干预措施可以开始处理主要的非传染性疾病风险因素,并建立更大的卫生系统能力,并在2030年以后继续产生效益。
{"title":"Best Investments in Chronic, Noncommunicable Disease Prevention and Control in Low- and Lower–Middle-Income Countries","authors":"David Watkins, S. Ahmed, Sarah J. Pickersgill, Saleema Razvi","doi":"10.1017/bca.2023.25","DOIUrl":"https://doi.org/10.1017/bca.2023.25","url":null,"abstract":"\u0000 The world remains off-track for the sustainable development goal (SDG) target 3.4, which calls for a one-third reduction in noncommunicable diseases (NCDs) mortality by 2030. This paper presents benefit–cost analyses of various NCD interventions in low-income (LICs) and lower–middle-income (LMCs) countries. We looked at 30 interventions recommended by the Disease Control Priorities Project, including six intersectoral policies (e.g., taxes) and 24 clinical services. We used a previously published model to estimate intervention costs and benefits through 2030, discounted at 8%. We focused on interventions with benefit–cost ratios (BCRs) > 15 and their contribution toward achieving the SDG target. We found that intersectoral policies often provided great value for money, with BCRs ranging from 40 (trans-fat bans) to 100 (tobacco excise taxes). However, seven clinical interventions (e.g., basic treatment of cardiovascular disease or breast cancer) also had BCRs > 15. The overall population impact of clinical interventions over the 2023–2030 period would be much higher than that of the intersectoral policies, which can take many years to reach their peak effects. Fully implementing the best-investment interventions would accelerate progress toward SDG 3.4 everywhere, but only one in 10 countries would achieve the target. This strategy would require an additional US$ 2.4 billion annually across all LICs and LMCs. We conclude that there are several cost-beneficial opportunities to tackle NCDs in LICs and LMCs. In countries with very limited resources, the best-investment interventions could begin to address the major NCD risk factors and build greater health system capacity, with benefits continuing to accrue beyond 2030.","PeriodicalId":45587,"journal":{"name":"Journal of Benefit-Cost Analysis","volume":"11 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2023-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85749043","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"经济学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
The Investment Case for Land Tenure Security in Sub-Saharan Africa: A Cost–Benefit Analysis 撒哈拉以南非洲土地保有权保障的投资案例:成本效益分析
IF 3.4 4区 经济学 Q2 ECONOMICS Pub Date : 2023-07-06 DOI: 10.1017/bca.2023.14
F. Byamugisha, Nancy Dubosse
Government is the custodian of the most critical (and limited) factor of production, namely, land. Assuring the security of tenure, arbitrating disputes, and facilitating the transfer or sales of titles renders the land market more efficient and less volatile, attracting investors and promoting sustainable urban development. Land tenure security is also a critical government service that has repercussions on agricultural productivity, housing development, business investment, and the development of urban areas. However, land administration is mired in corruptive practices, elite capture, and inefficient allocation. Globally, only 24% of rural areas are mapped (46 in urban areas), with approximately the same percentage registered, that is, 22%. In Africa, only about 14% of rural land is formally recorded in a public register. Land tenure security can take a variety of forms depending on national regulatory frameworks that allocate land and specify its use. Success stories include transferable user certificates in China and individual land titles in Rwanda. Systematic evaluation of the evidence on tenure programs demonstrates that improved tenure security increases agricultural output (40% on average), increases urban land values (25% on average), and increases household welfare (15% on average). Other observed country-specific benefits include additional years of schooling, better academic performance, access to credit, reforestation, and improved household nutrition. The costs of establishing tenure security in Sub-Saharan Africa include the separate costs of rural (US$ 3 billion) and urban (US$ 2.2 billion) land registration; the cost of digitizing land registries and information to improve efficiency and transparency (US$ 880 million), the cost of strengthening institutions and systems to resolve land disputes and manage expropriations (US$ 960 million) over a ten-year implementation period, and land administration operations and land records maintenance over 30 years (US$ 64 billion). The net present value (8%) of costs is US$ 21.7 billion for rural land tenure and US$ 5.3 billion for urban areas. The benefits of rural land registration were based on the observed 15% household wealth effect noted in the literature. The net present value (8%) of a 30-year benefits stream is US$ 396 billion. The benefit–cost ratio of completing and modernizing land registration and improving land administration coverage and effectiveness in rural Sub-Saharan Africa is 18. The benefits of urban land registration were based on the average 25% increase in property values observed in the literature. Using housing prices for the 20 largest, Sub-Saharan African countries, the net present value (8%) of the benefits over a 30-year period is US$ 237 billion, yielding a benefit–cost ratio of 45 when the average housing price is used. When the population-weighted housing price is used, benefits are valued at US$ 160 billion, yielding a benefit–cost ratio of 30.
政府是最关键(也是最有限)的生产要素,即土地的管理者。确保土地保有权的安全、仲裁纠纷和促进土地所有权的转让或出售,使土地市场更有效率和更稳定,吸引投资者和促进可持续的城市发展。土地保有权保障也是一项重要的政府服务,对农业生产力、住房开发、商业投资和城市地区的发展都有影响。然而,土地管理陷入了腐败行为、精英捕获和低效分配的泥潭。在全球范围内,只有24%的农村地区绘制了地图(城市地区为46%),登记的比例大致相同,即22%。在非洲,只有大约14%的农村土地被正式登记在公共登记册中。根据分配土地和具体规定土地用途的国家监管框架,土地保有权保障可以采取多种形式。成功案例包括中国的可转让用户证书和卢旺达的个人土地所有权。对权居项目证据的系统评估表明,权居保障的改善提高了农业产出(平均提高40%),提高了城市土地价值(平均提高25%),提高了家庭福利(平均提高15%)。其他观察到的具体国家效益包括增加受教育年限、提高学习成绩、获得信贷、重新造林和改善家庭营养。在撒哈拉以南非洲建立权属保障的成本包括农村(30亿美元)和城市(22亿美元)土地登记的单独成本;将土地登记和信息数字化以提高效率和透明度的成本(8.8亿美元),在十年的实施期内加强解决土地纠纷和管理征收的制度和系统的成本(9.6亿美元),以及30年的土地管理业务和土地记录维护成本(640亿美元)。农村土地使用权的净现值(8%)为217亿美元,城市地区为53亿美元。农村土地登记的好处是基于文献中观察到的15%的家庭财富效应。30年福利流的净现值(8%)为3960亿美元。在撒哈拉以南非洲农村地区,完成土地登记并使之现代化以及改善土地管理覆盖面和效率的收益成本比为18。城市土地登记的好处是基于文献中观察到的房地产价值平均25%的增长。使用20个最大的撒哈拉以南非洲国家的房价,30年期间的净现值(8%)为2370亿美元,如果使用平均房价,收益-成本比为45。如果使用人口加权房价,福利价值为1600亿美元,收益成本比为30。
{"title":"The Investment Case for Land Tenure Security in Sub-Saharan Africa: A Cost–Benefit Analysis","authors":"F. Byamugisha, Nancy Dubosse","doi":"10.1017/bca.2023.14","DOIUrl":"https://doi.org/10.1017/bca.2023.14","url":null,"abstract":"\u0000 Government is the custodian of the most critical (and limited) factor of production, namely, land. Assuring the security of tenure, arbitrating disputes, and facilitating the transfer or sales of titles renders the land market more efficient and less volatile, attracting investors and promoting sustainable urban development. Land tenure security is also a critical government service that has repercussions on agricultural productivity, housing development, business investment, and the development of urban areas. However, land administration is mired in corruptive practices, elite capture, and inefficient allocation. Globally, only 24% of rural areas are mapped (46 in urban areas), with approximately the same percentage registered, that is, 22%. In Africa, only about 14% of rural land is formally recorded in a public register. Land tenure security can take a variety of forms depending on national regulatory frameworks that allocate land and specify its use. Success stories include transferable user certificates in China and individual land titles in Rwanda. Systematic evaluation of the evidence on tenure programs demonstrates that improved tenure security increases agricultural output (40% on average), increases urban land values (25% on average), and increases household welfare (15% on average). Other observed country-specific benefits include additional years of schooling, better academic performance, access to credit, reforestation, and improved household nutrition. The costs of establishing tenure security in Sub-Saharan Africa include the separate costs of rural (US$ 3 billion) and urban (US$ 2.2 billion) land registration; the cost of digitizing land registries and information to improve efficiency and transparency (US$ 880 million), the cost of strengthening institutions and systems to resolve land disputes and manage expropriations (US$ 960 million) over a ten-year implementation period, and land administration operations and land records maintenance over 30 years (US$ 64 billion). The net present value (8%) of costs is US$ 21.7 billion for rural land tenure and US$ 5.3 billion for urban areas. The benefits of rural land registration were based on the observed 15% household wealth effect noted in the literature. The net present value (8%) of a 30-year benefits stream is US$ 396 billion. The benefit–cost ratio of completing and modernizing land registration and improving land administration coverage and effectiveness in rural Sub-Saharan Africa is 18. The benefits of urban land registration were based on the average 25% increase in property values observed in the literature. Using housing prices for the 20 largest, Sub-Saharan African countries, the net present value (8%) of the benefits over a 30-year period is US$ 237 billion, yielding a benefit–cost ratio of 45 when the average housing price is used. When the population-weighted housing price is used, benefits are valued at US$ 160 billion, yielding a benefit–cost ratio of 30.","PeriodicalId":45587,"journal":{"name":"Journal of Benefit-Cost Analysis","volume":"1 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2023-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89711386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"经济学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Investing in Nutrition: A Global Best Investment Case 投资营养:全球最佳投资案例
IF 3.4 4区 经济学 Q2 ECONOMICS Pub Date : 2023-06-30 DOI: 10.1017/bca.2023.22
B. Larsen, J. Hoddinott, Saleema Razvi
Undernutrition and micronutrient deficiencies are key drivers of infant and child mortality and are causes of impaired human potential for hundreds of millions of children every year. Investing in nutrition in the first 1,000 days from conception not only supports individual lifetime health, education, and productivity, but is also key to breaking the intergenerational cycle of malnutrition and enhance equitable development pathways for low- and middle-income countries. This paper provides a cost–benefit analysis of three nutrition interventions: 1) provision of preventive small-quantity lipid-based nutrient supplements (SQ-LNS) to children 6−23 months of age; 2) Complementary Feeding Promotion (CFP) for children 6−23 months of age; 3) provision of multiple micronutrient (MMN) and calcium (Ca) supplements to pregnant women. The benefit–cost ratios (BCRs) for MMN supplementation for pregnant women replacing iron and folic acid (37.5), as well as MMN and Ca combined (19-24), are the highest. The BCRs for CFP for children in the two highest socio-economic status (SES) quintiles and SQ-LNS for children in the three lowest SES quintiles are fairly similar at 16 and 14, respectively. The lowest BCR is for CFP for children in the three lowest SES quintiles due to the high cost of accomplishing behavioral change for improved complementary feeding in resource-poor households.
营养不足和微量营养素缺乏是婴儿和儿童死亡的主要驱动因素,也是每年数亿儿童人类潜能受损的原因。在受孕后的头1 000天对营养进行投资,不仅有助于个人一生的健康、教育和生产力,也是打破营养不良代际循环和加强低收入和中等收入国家公平发展道路的关键。本文提供了三种营养干预措施的成本效益分析:1)为6 - 23个月大的儿童提供预防性小剂量脂质营养补充剂(SQ-LNS);2)促进6 ~ 23月龄儿童补充喂养(CFP);3)向孕妇提供多种微量营养素(MMN)和钙(Ca)补充剂。孕妇补充MMN替代铁和叶酸(37.5)以及MMN和Ca联合(19-24)的效益成本比(bcr)最高。两个社会经济地位最高的五分位数儿童的CFP bcr和三个社会经济地位最低的五分位数儿童的SQ-LNS在16岁和14岁时相当相似。由于在资源贫乏的家庭中为改善补充喂养而实现行为改变的成本很高,社会经济地位最低的三个五分之一的儿童的CFP的BCR最低。
{"title":"Investing in Nutrition: A Global Best Investment Case","authors":"B. Larsen, J. Hoddinott, Saleema Razvi","doi":"10.1017/bca.2023.22","DOIUrl":"https://doi.org/10.1017/bca.2023.22","url":null,"abstract":"\u0000 Undernutrition and micronutrient deficiencies are key drivers of infant and child mortality and are causes of impaired human potential for hundreds of millions of children every year. Investing in nutrition in the first 1,000 days from conception not only supports individual lifetime health, education, and productivity, but is also key to breaking the intergenerational cycle of malnutrition and enhance equitable development pathways for low- and middle-income countries. This paper provides a cost–benefit analysis of three nutrition interventions: 1) provision of preventive small-quantity lipid-based nutrient supplements (SQ-LNS) to children 6−23 months of age; 2) Complementary Feeding Promotion (CFP) for children 6−23 months of age; 3) provision of multiple micronutrient (MMN) and calcium (Ca) supplements to pregnant women. The benefit–cost ratios (BCRs) for MMN supplementation for pregnant women replacing iron and folic acid (37.5), as well as MMN and Ca combined (19-24), are the highest. The BCRs for CFP for children in the two highest socio-economic status (SES) quintiles and SQ-LNS for children in the three lowest SES quintiles are fairly similar at 16 and 14, respectively. The lowest BCR is for CFP for children in the three lowest SES quintiles due to the high cost of accomplishing behavioral change for improved complementary feeding in resource-poor households.","PeriodicalId":45587,"journal":{"name":"Journal of Benefit-Cost Analysis","volume":"14 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87698579","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"经济学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
A Benefit-Cost Analysis of Increased International Migration of Skilled Labor in Africa and the World 非洲和世界熟练劳动力国际移徙增加的收益-成本分析
IF 3.4 4区 经济学 Q2 ECONOMICS Pub Date : 2023-06-22 DOI: 10.1017/bca.2023.15
K. Maskus
Greater labor migration can establish more channels for information flows, directly contributing to faster economic growth and improved innovation and work. It can also expand international remittances, which can be invested by recipient households in home countries in education, entrepreneurship, and improved and sustainable agricultural technologies. At the same time, however, increased emigration of medical professionals and technical workers from poor countries can reduce quality of local services, innovation, health status, and productivity. This analysis attempts to quantify the economic benefits and costs of permitting an immediate 10% increase in the bilateral migration of skilled workers (physicians, engineers or science, engineering, technology, and mathematics workers, and other persons with advanced educations) among the nations of the African Continental Free Trade Area and, more broadly, among 25 global regions. Economic benefits include higher migrant incomes abroad, welfare gains in destination countries associated with higher economic efficiency, spillover productivity gains, and an improved ability of the younger and more skilled working force to support the needs of the wider population, resulting in higher national production. Benefits in source countries include productivity enhancements from two sources: (a) greater access to knowledge associated with more bilateral trade and investment and (b) the ability of local households to invest remittances in productivity-enhancing activities. Welfare losses in source nations include static efficiency reductions and a worsened demographic support capability. In Africa, the benefit-cost ratios range from 3.7 to 6.9; in the global analysis, 17 to 38.
扩大劳动力流动,可以建立更多的信息流动渠道,直接有助于加快经济增长,改善创新和工作。它还可以扩大国际汇款,使受援国家庭可以将国际汇款投资于教育、创业以及改进的可持续农业技术。然而,与此同时,来自贫穷国家的医疗专业人员和技术工人移民的增加可能会降低当地服务的质量、创新、健康状况和生产力。本分析试图量化允许非洲大陆自由贸易区国家之间以及更广泛地说,全球25个地区之间技术工人(医生、工程师或科学、工程、技术和数学工作者以及其他受过高等教育的人)双边移民立即增加10%的经济效益和成本。经济效益包括海外移民收入的提高、目的国与更高经济效率相关的福利收益、外溢生产率的提高,以及更年轻、更熟练的劳动力支持更广泛人口需求的能力的提高,从而提高国家生产。来源国的利益包括两个方面的生产率提高:(a)与更多双边贸易和投资相关的知识获得机会增加;(b)当地家庭将汇款投资于提高生产率的活动的能力增强。来源国的福利损失包括静态效率降低和人口支持能力恶化。在非洲,效益成本比从3.7到6.9不等;在全球分析中,是17到38。
{"title":"A Benefit-Cost Analysis of Increased International Migration of Skilled Labor in Africa and the World","authors":"K. Maskus","doi":"10.1017/bca.2023.15","DOIUrl":"https://doi.org/10.1017/bca.2023.15","url":null,"abstract":"\u0000 Greater labor migration can establish more channels for information flows, directly contributing to faster economic growth and improved innovation and work. It can also expand international remittances, which can be invested by recipient households in home countries in education, entrepreneurship, and improved and sustainable agricultural technologies. At the same time, however, increased emigration of medical professionals and technical workers from poor countries can reduce quality of local services, innovation, health status, and productivity. This analysis attempts to quantify the economic benefits and costs of permitting an immediate 10% increase in the bilateral migration of skilled workers (physicians, engineers or science, engineering, technology, and mathematics workers, and other persons with advanced educations) among the nations of the African Continental Free Trade Area and, more broadly, among 25 global regions. Economic benefits include higher migrant incomes abroad, welfare gains in destination countries associated with higher economic efficiency, spillover productivity gains, and an improved ability of the younger and more skilled working force to support the needs of the wider population, resulting in higher national production. Benefits in source countries include productivity enhancements from two sources: (a) greater access to knowledge associated with more bilateral trade and investment and (b) the ability of local households to invest remittances in productivity-enhancing activities. Welfare losses in source nations include static efficiency reductions and a worsened demographic support capability. In Africa, the benefit-cost ratios range from 3.7 to 6.9; in the global analysis, 17 to 38.","PeriodicalId":45587,"journal":{"name":"Journal of Benefit-Cost Analysis","volume":"13 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2023-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77266637","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"经济学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Discounting in Natural Resource Damage Assessment – Erratum 自然资源损害评估的贴现。勘误
IF 3.4 4区 经济学 Q2 ECONOMICS Pub Date : 2023-06-14 DOI: 10.1017/bca.2023.1
Eric J. Horsch, D. Phaneuf, C. Giguere, Jason H. Murray, Cameron Duff, Cole Kroninger
© The Author(s), 2023. Published by Cambridge University Press on behalf of the Society for Benefit-Cost Analysis. This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (https://creativecommons.org/ licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited. Journal of Benefit-Cost Analysis (2023), 14: 1, 162 doi:10.1017/bca.2023.1
©作者,2023。由剑桥大学出版社代表利益成本分析协会出版。这是一篇开放获取的文章,在知识共享署名许可(https://creativecommons.org/ licenses/by/4.0/)的条款下分发,该许可允许在任何媒介上不受限制地重复使用、分发和复制,前提是原始作品被适当引用。效益-成本分析,2013,14 (1),162 doi:10.1017/bca.2023.1
{"title":"Discounting in Natural Resource Damage Assessment – Erratum","authors":"Eric J. Horsch, D. Phaneuf, C. Giguere, Jason H. Murray, Cameron Duff, Cole Kroninger","doi":"10.1017/bca.2023.1","DOIUrl":"https://doi.org/10.1017/bca.2023.1","url":null,"abstract":"© The Author(s), 2023. Published by Cambridge University Press on behalf of the Society for Benefit-Cost Analysis. This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (https://creativecommons.org/ licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited. Journal of Benefit-Cost Analysis (2023), 14: 1, 162 doi:10.1017/bca.2023.1","PeriodicalId":45587,"journal":{"name":"Journal of Benefit-Cost Analysis","volume":"192 1","pages":"162 - 162"},"PeriodicalIF":3.4,"publicationDate":"2023-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77516288","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"经济学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
BCA volume 14 issue 1 Cover and Front matter BCA第14卷第1期封面和封面问题
IF 3.4 4区 经济学 Q2 ECONOMICS Pub Date : 2023-06-14 DOI: 10.1017/bca.2023.28
{"title":"BCA volume 14 issue 1 Cover and Front matter","authors":"","doi":"10.1017/bca.2023.28","DOIUrl":"https://doi.org/10.1017/bca.2023.28","url":null,"abstract":"","PeriodicalId":45587,"journal":{"name":"Journal of Benefit-Cost Analysis","volume":"1 1","pages":"f1 - f2"},"PeriodicalIF":3.4,"publicationDate":"2023-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79924147","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"经济学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Investment Case for E-Government Procurement: A Cost–Benefit Analysis 电子政府采购的投资案例:成本效益分析
IF 3.4 4区 经济学 Q2 ECONOMICS Pub Date : 2023-06-13 DOI: 10.1017/bca.2023.10
E. Bosio, G. Hayman, Nancy Dubosse
In almost every country, government is the largest buyer of works, goods, and services from the private sector. Through the laws and practice of public procurement, governments create competition among firms, thus optimizing public expenditure. However, public procurement is often associated with inefficient allocation of resources and corruption. One method to reduce inefficiencies and abuse in public procurement is the use of e-government procurement (e-GP) platforms. Yet nearly 40% of countries—mostly low- and lower-middle income countries—do not have functioning e-GP platforms. Cost–benefit analysis is used to make the investment case for the development and integration of e-procurement systems in low- and lower middle-income countries. The costs of setting up an e- GP system include an initial investment of $9.03 million, on average, for the planning, design, and build phases spread over a 5-year period. Annual operating and maintenance expenses during pilot and deployment phases are estimated at $1.1 million annually. In total, it is estimated that the net present value of costs to design, build, test, deploy, and operate a robust e-GP system is $16.7 million for a typical low- and middle-income country (at an 8% discount rate). While there are many tangible benefits of e-GP, the benefit assessed here is the reduction in the prices of goods, works, and services paid by government buyers. Using the average percentage reduction in procurement prices of 6.75%, the savings from an e-procurement system are valued at $637.9 million and $5.2 billion for low- and lower middle-income countries, respectively. The benefit–cost ratio of implementing an e-GP system in the average low-income country ranges from 8 to 58 and is 142 to 473 for a lower middle-income country. The size of the procurement market, the reduction in procurement prices, the duration of the implementation process, and the penetration rate of e-GP throughout government are principal determinants in the return on investment.
几乎在每个国家,政府都是从私营部门购买工程、商品和服务的最大买家。通过公共采购的法律和实践,政府在企业之间创造竞争,从而优化公共支出。然而,公共采购往往与资源分配效率低下和腐败有关。减少公共采购效率低下和滥用的一个方法是使用电子政府采购(e-GP)平台。然而,近40%的国家——主要是低收入和中低收入国家——没有正常运行的电子全科医生平台。成本效益分析用于在低收入和中低收入国家开发和整合电子采购系统的投资案例。建立一个电子全科医生系统的成本包括平均903万美元的初始投资,用于5年的规划、设计和建造阶段。在试验和部署阶段,每年的操作和维护费用估计为110万美元。总的来说,对于一个典型的中低收入国家(折扣率为8%),估计设计、建造、测试、部署和运行一个强大的e-GP系统的净现值为1670万美元。虽然电子gp有许多切实的好处,但这里评估的好处是降低了政府买家支付的商品、工程和服务的价格。按照采购价格平均降低6.75%的百分比计算,电子采购系统为低收入和中低收入国家分别节省了6.379亿美元和52亿美元。在一般低收入国家实施电子全科医生系统的效益-成本比为8 - 58,中等偏下收入国家为142 - 473。采购市场的规模、采购价格的降低、实施过程的持续时间以及电子gp在整个政府中的普及率是投资回报的主要决定因素。
{"title":"The Investment Case for E-Government Procurement: A Cost–Benefit Analysis","authors":"E. Bosio, G. Hayman, Nancy Dubosse","doi":"10.1017/bca.2023.10","DOIUrl":"https://doi.org/10.1017/bca.2023.10","url":null,"abstract":"In almost every country, government is the largest buyer of works, goods, and services from the private sector. Through the laws and practice of public procurement, governments create competition among firms, thus optimizing public expenditure. However, public procurement is often associated with inefficient allocation of resources and corruption. One method to reduce inefficiencies and abuse in public procurement is the use of e-government procurement (e-GP) platforms. Yet nearly 40% of countries—mostly low- and lower-middle income countries—do not have functioning e-GP platforms. Cost–benefit analysis is used to make the investment case for the development and integration of e-procurement systems in low- and lower middle-income countries. The costs of setting up an e- GP system include an initial investment of $9.03 million, on average, for the planning, design, and build phases spread over a 5-year period. Annual operating and maintenance expenses during pilot and deployment phases are estimated at $1.1 million annually. In total, it is estimated that the net present value of costs to design, build, test, deploy, and operate a robust e-GP system is $16.7 million for a typical low- and middle-income country (at an 8% discount rate). While there are many tangible benefits of e-GP, the benefit assessed here is the reduction in the prices of goods, works, and services paid by government buyers. Using the average percentage reduction in procurement prices of 6.75%, the savings from an e-procurement system are valued at $637.9 million and $5.2 billion for low- and lower middle-income countries, respectively. The benefit–cost ratio of implementing an e-GP system in the average low-income country ranges from 8 to 58 and is 142 to 473 for a lower middle-income country. The size of the procurement market, the reduction in procurement prices, the duration of the implementation process, and the penetration rate of e-GP throughout government are principal determinants in the return on investment.","PeriodicalId":45587,"journal":{"name":"Journal of Benefit-Cost Analysis","volume":"28 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2023-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90974698","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"经济学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
期刊
Journal of Benefit-Cost Analysis
全部 Acc. Chem. Res. ACS Applied Bio Materials ACS Appl. Electron. Mater. ACS Appl. Energy Mater. ACS Appl. Mater. Interfaces ACS Appl. Nano Mater. ACS Appl. Polym. Mater. ACS BIOMATER-SCI ENG ACS Catal. ACS Cent. Sci. ACS Chem. Biol. ACS Chemical Health & Safety ACS Chem. Neurosci. ACS Comb. Sci. ACS Earth Space Chem. ACS Energy Lett. ACS Infect. Dis. ACS Macro Lett. ACS Mater. Lett. ACS Med. Chem. Lett. ACS Nano ACS Omega ACS Photonics ACS Sens. ACS Sustainable Chem. Eng. ACS Synth. Biol. Anal. Chem. BIOCHEMISTRY-US Bioconjugate Chem. BIOMACROMOLECULES Chem. Res. Toxicol. Chem. Rev. Chem. Mater. CRYST GROWTH DES ENERG FUEL Environ. Sci. Technol. Environ. Sci. Technol. Lett. Eur. J. Inorg. Chem. IND ENG CHEM RES Inorg. Chem. J. Agric. Food. Chem. J. Chem. Eng. Data J. Chem. Educ. J. Chem. Inf. Model. J. Chem. Theory Comput. J. Med. Chem. J. Nat. Prod. J PROTEOME RES J. Am. Chem. Soc. LANGMUIR MACROMOLECULES Mol. Pharmaceutics Nano Lett. Org. Lett. ORG PROCESS RES DEV ORGANOMETALLICS J. Org. Chem. J. Phys. Chem. J. Phys. Chem. A J. Phys. Chem. B J. Phys. Chem. C J. Phys. Chem. Lett. Analyst Anal. Methods Biomater. Sci. Catal. Sci. Technol. Chem. Commun. Chem. Soc. Rev. CHEM EDUC RES PRACT CRYSTENGCOMM Dalton Trans. Energy Environ. Sci. ENVIRON SCI-NANO ENVIRON SCI-PROC IMP ENVIRON SCI-WAT RES Faraday Discuss. Food Funct. Green Chem. Inorg. Chem. Front. Integr. Biol. J. Anal. At. Spectrom. J. Mater. Chem. A J. Mater. Chem. B J. Mater. Chem. C Lab Chip Mater. Chem. Front. Mater. Horiz. MEDCHEMCOMM Metallomics Mol. Biosyst. Mol. Syst. Des. Eng. Nanoscale Nanoscale Horiz. Nat. Prod. Rep. New J. Chem. Org. Biomol. Chem. Org. Chem. Front. PHOTOCH PHOTOBIO SCI PCCP Polym. Chem.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1