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The impact of a scholarship programme on social capital formation among university students: An economic experiment at the University of Pretoria, South Africa 奖学金项目对大学生社会资本形成的影响:南非比勒陀利亚大学的一项经济实验
IF 0.6 Q3 Agricultural and Biological Sciences Pub Date : 2023-06-30 DOI: 10.53936/afjare.2023.18(1).3
Eric Chikwalila, M. Willinger, S. Farolfi, E. Mungatana, D. Jourdain
This study uses an online laboratory experiment and a post-experimental survey to test whether the Mastercard Foundation (MCF) scholarship programme causally influences the creation of cognitive social capital among University of Pretoria recipients. Cognitive social capital, which is based on commonly shared norms among subjects, leads to honest and cooperative behaviour. It is necessary for ease of information flow, a reduction in transaction costs, and allowing communities to deal with social dilemmas like common-pool resource management. The study used incentivised economic experiments on randomly selected subjects drawn from a control group (non-MCF students) and a treated group (MCF students). The experimental results from the two groups were compared to check the differences in terms of levels of trust, reciprocity, altruism, cooperation, in-group favouritism and out-group discrimination. Our results show that the scholarship programme has a significant impact only on levels of in-group favouritism and out-group discrimination. The post-experimental survey showed that MCF and non-MCF subjects were similar in terms of stated pro-social behaviour perceptions and in-group social capital creation.
这项研究使用了一项在线实验室实验和一项实验后调查来测试万事达基金会(MCF)奖学金计划是否对比勒陀利亚大学获奖者认知社会资本的创造产生了因果影响。认知社会资本基于主体之间共同的规范,导致诚实和合作的行为。这对于简化信息流、降低交易成本以及允许社区处理诸如公共池资源管理之类的社会困境是必要的。该研究对随机选择的受试者进行了激励性经济实验,这些受试者分别来自对照组(非MCF学生)和治疗组(MCF同学)。比较两组的实验结果,以检验信任、互惠、利他主义、合作、组内偏袒和组外歧视水平的差异。我们的研究结果表明,奖学金计划只对群体内的偏袒和群体外的歧视程度产生重大影响。实验后调查显示,MCF和非MCF受试者在所陈述的亲社会行为认知和群体社会资本创造方面相似。
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引用次数: 0
Determinants of arable crop farmers’ decisions to adapt to climate change risks in Nigeria 尼日利亚可耕地作物农民适应气候变化风险的决定因素
IF 0.6 Q3 Agricultural and Biological Sciences Pub Date : 2023-06-30 DOI: 10.53936/afjare.2023.18(1).1
Anthony Ojonimi Onoja
This study ascertained the influence of farmers’ perceptions of climate change effects and their household characteristics on the choice of adaptation technologies they adopt. The survey relied mainly on institutional and primary data for its analysis. Primary data was obtained from arable crop farmers using a set of structured questionnaires administered in a multi-stage, stratified random sampling manner. Sixty (60) farmers were selected from randomly selected states for the five agroclimatic zones in Nigeria, giving a total sample size of 300 farmers. The collected data was analysed using Heckman’s probit selectivity model. It was found that extension contact, gender of the head of household, temperature and rainfall levels determined the decision to adapt to climate change. The respective Z estimates of these aspects were 5.75 (p < 0.01), 5.30 (p < 0.01), 2.32 (p < 0.01) and -9.50 (p < 0.01). However, the farmers’ perceptions of climate change effects were determined by education and agricultural extension access. The Z values for these were 5.42 (p < 0.01) and 2.86 (p < 0.01) respectively. The researcher recommends urgent measures to help farmers adapt to climate change, such as the establishment of weather stations and building the capacities of farmers, especially women.
这项研究确定了农民对气候变化影响的看法及其家庭特征对他们选择适应技术的影响。调查主要依靠机构和原始数据进行分析。主要数据是使用一组结构化问卷从种植作物的农民那里获得的,该问卷以多阶段、分层随机抽样的方式进行管理。从尼日利亚五个农业气候区随机选择的州中选出六十(60)名农民,总样本量为300名农民。使用Heckman的probit选择性模型对收集的数据进行分析。研究发现,扩展接触、户主性别、温度和降雨量决定了适应气候变化的决定。这些方面的Z估计值分别为5.75(p<0.01)、5.30(p<0.01),2.32(p<0.01)和-9.50(p<0.01)。然而,农民对气候变化影响的感知是由教育和农业推广机会决定的。其Z值分别为5.42(p<0.01)和2.86(p<0.01)。研究人员建议采取紧急措施帮助农民适应气候变化,例如建立气象站和建设农民,特别是妇女的能力。
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引用次数: 0
Evaluating households’ willingness to pay for private water supply services in Wakiso District, Uganda 评估乌干达瓦基索区家庭为私人供水服务付费的意愿
IF 0.6 Q3 Agricultural and Biological Sciences Pub Date : 2023-06-30 DOI: 10.53936/afjare.2023.18(1).5
Moses Ssebaggala, S. Karuaihe
Accessing water supply services remains a serious challenge in Wakiso District in Uganda, where most households travel long distances to collect water – a process that threatens their health, productivity and economic wellbeing. Although addressing this challenge requires huge financial investment, the value households attach to accessing private water supply services at their premises is not clear. This study used data from 243 households to determine their willingness to pay (WTP) for private water supply services. The analysis applied the Heckman model to check for sample selection bias, and the contingent valuation method (CVM) to estimate the WTP. The mean WTP was estimated at UGX 203.07 (USD 0.06) per 20 litre jerry can. Socioeconomic and demographic factors that influence WTP were also determined. These findings could guide the design of policies on sustainable water supply and cost recovery in the long run.
在乌干达瓦基索区,获得供水服务仍然是一个严峻的挑战,那里的大多数家庭都要长途跋涉取水,这一过程威胁到他们的健康、生产力和经济福祉。尽管应对这一挑战需要巨大的财政投资,但家庭对在其经营场所获得私人供水服务的重视程度尚不清楚。这项研究使用了243户家庭的数据来确定他们为私人供水服务付费的意愿。该分析应用Heckman模型来检查样本选择偏差,并应用条件估值法(CVM)来估计WTP。平均WTP估计为每20升油桶203.07乌干达格(0.06美元)。还确定了影响WTP的社会经济和人口因素。从长远来看,这些发现可以指导可持续供水和成本回收政策的设计。
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引用次数: 0
Impact of the adoption of residue retention on household maize yield in northern Zambia 赞比亚北部采用残茬保留对家庭玉米产量的影响
IF 0.6 Q3 Agricultural and Biological Sciences Pub Date : 2023-06-30 DOI: 10.53936/afjare.2023.18(1).6
Sulinkhundla Maseko, S. Karuaihe, D. Jourdain
Evaluating the impact of agricultural practices helps policymakers and farmers in their decisionmaking. In Zambia, most households depend on agricultural activities, in particular maize production. This paper examines the impact of the adoption of residue retention on households’ maize yield in northern Zambia. We used the propensity score matching (PSM) method. By using the probit model, we also determined the factors that influence the adoption of residue retention. The results show that adopting residue retention has a positive and significant net effect on household maize yield. Residue retention traps moisture in the soil and improves soil structure. This suggests that a greater focus on this aspect is required to encourage more farmers to adopt residue retention to improve maize yield. Government policies can be structured to promote residue retention among smallholder farmers.
评估农业实践的影响有助于决策者和农民做出决策。在赞比亚,大多数家庭依靠农业活动,特别是玉米生产。本文考察了赞比亚北部采用残茬保留对农户玉米产量的影响。我们使用倾向得分匹配(PSM)方法。通过probit模型,我们还确定了影响残馀保留采用的因素。结果表明,秸秆保留对农户玉米产量有显著的正净效应。残留在土壤中的水分和改善土壤结构。这表明需要更多地关注这方面,以鼓励更多的农民采用残茬保留来提高玉米产量。政府可以制定政策,以促进小农的剩余物保留。
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引用次数: 0
The odds of South African agriculture using wildlife ranching to adapt to climate change 南非农业利用野生动物牧场适应气候变化的可能性
IF 0.6 Q3 Agricultural and Biological Sciences Pub Date : 2023-06-30 DOI: 10.53936/afjare.2023.18(1).4
J. Otieno, E. Muchapondwa, Herbert Ntuli
In this paper, we explore the role of wildlife in climate change adaptation, especially in areas used predominantly for livestock production in South Africa. Using a sample of 3 449 wildlife and livestock ranches, we estimate a multinomial choice model of various ranching options in these areas. The results indicate that mixed wildlife-livestock ranches are less vulnerable to climate change when compared to ranches with only wildlife or only livestock. However, given the ranching options, the revenues of ranches with only wildlife are higher compared to other ranches. The results further show that an increase in temperature will influence more livestock farmers, especially those farming with cattle, to change their land use from livestock to wildlife ranching. Using climate models, we establish that livestock farmers in the Eastern Cape province of South Africa will be affected most by climate change and will subsequently change their land use.
在这篇论文中,我们探讨了野生动物在适应气候变化中的作用,特别是在南非主要用于畜牧生产的地区。使用3249个野生动物和畜牧牧场的样本,我们估计了这些地区各种牧场选择的多项式选择模型。结果表明,与只有野生动物或只有牲畜的牧场相比,混合野生动物-牲畜牧场不太容易受到气候变化的影响。然而,考虑到牧场的选择,只有野生动物的牧场的收入高于其他牧场。研究结果进一步表明,温度的升高将影响更多的畜牧业农民,尤其是那些养牛的农民,将他们的土地利用从畜牧业转变为野生动物牧场。利用气候模型,我们确定南非东开普省的畜牧业农民将受到气候变化的最大影响,并随后改变他们的土地使用。
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引用次数: 0
Climate variability and agricultural productivity in Uganda 乌干达的气候变化和农业生产力
Q3 Agricultural and Biological Sciences Pub Date : 2023-06-30 DOI: 10.53936/afjare.2023.18(1).2
Peter Babyenda, Jane Kabubo-Mariara, Sule Odhiambo
Uganda’s climate is changing in terms of rising temperatures and altered precipitation patterns, leading to extreme meteorological conditions such as prolonged drought, floods and landslides. Yet the majority (68%) of Ugandans rely largely on rain-fed agriculture, which is affected by climate variability. This study therefore investigates the effect of climate variability on agricultural productivity in Uganda by combining long-term climate data, sourced from the United States National Oceanic and Atmospheric Administration (NOAA), and six waves of the Uganda National Panel Survey (UNPS) spanning the period 2009 to 2019. Trends and the regression analysis estimated with panel data confirm the existence of climate variability, as well as the vulnerability of farming households across Uganda. The empirical results indicate a significant U-shaped impact of precipitation variability on agricultural productivity. This tends to suggest that, as variability in precipitation intensifies, farming households will adapt to the changing precipitation and thereby improve their productivity. The regional and crop-specific analysis show that, relative to other regions of the country, Eastern Uganda is likely to be the region affected the most, while beans and banana are likely to be affected more by climate variability compared to other crops such as maize and cassava. The study thus recommends measures aimed at encouraging farmers to adapt and increase agricultural productivity. There is a need to strengthen the provision of extension services and inform farmers about climate variability
乌干达的气候正在发生变化,气温上升,降水模式改变,导致极端气象条件,如长期干旱、洪水和山体滑坡。然而,大多数(68%)乌干达人主要依靠受气候变化影响的雨养农业。因此,本研究通过结合来自美国国家海洋和大气管理局(NOAA)的长期气候数据,以及2009年至2019年期间乌干达国家小组调查(UNPS)的六波数据,调查了气候变率对乌干达农业生产力的影响。用面板数据估计的趋势和回归分析证实了气候变率的存在,以及乌干达各地农户的脆弱性。实证结果表明,降水变率对农业生产力的影响呈显著的u型。这往往表明,随着降水变异性的加剧,农户将适应不断变化的降水,从而提高生产率。区域和特定作物的分析表明,相对于该国的其他地区,乌干达东部可能是受影响最大的地区,而豆类和香蕉可能比玉米和木薯等其他作物更容易受到气候变化的影响。因此,该研究建议采取措施,鼓励农民适应并提高农业生产率。有必要加强提供推广服务,并使农民了解气候变化
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引用次数: 0
Responding to inefficiencies on smallholder maize farms: Can sustained adoption of sustainable agricultural practices make a difference? 应对小农玉米农场的低效率:持续采用可持续农业实践能带来改变吗?
IF 0.6 Q3 Agricultural and Biological Sciences Pub Date : 2022-12-31 DOI: 10.53936/afjare.2022.17(4).21
Wisdom Richard Mgomezulu, Kennedy Machira, A. Edriss, Innocent Pangapanga-Phiri, M. Chitete
This study aimed to bring forth empirical evidence of the effect of the sustained adoption of sustainable agricultural practices (SAPs) on the technical and profit efficiency of farmers. Previous studies remain inconclusive about whether the adoption of SAPs has any bearing on the efficiency of maize farmers. The current study introduced the concept of sustained adoption and compared levels of efficiency between one-time SAP adopters and sustained adopters. Using a sample of 2 100 households, the study employed the Cobb-Douglas stochastic frontier model to analyse both the technical and profit efficiency of maize farmers, and a two-stage tobit model was used to control for endogeneity. The study found that the one-time adoption of SAPs has no effect on the technical efficiency of maize farmers, whilst sustained adoption significantly improves the technical and profit efficiency of maize farmers. The study recommends a shift towards promoting the sustained adoption of SAPs for sustainable benefits for farmers.
本研究旨在为持续采用可持续农业实践(SAPs)对农民技术效率和利润效率的影响提供实证证据。以前的研究仍然没有得出结论,是否采用SAPs对玉米农民的效率有任何影响。目前的研究引入了持续采用的概念,并比较了一次性SAP采用者和持续采用者之间的效率水平。本研究采用Cobb-Douglas随机前沿模型分析玉米农户的技术效率和利润效率,并采用两阶段tobit模型控制内生性。研究发现,一次性采用SAPs对玉米农户的技术效率没有影响,而持续采用SAPs可显著提高玉米农户的技术效率和利润效率。该研究建议转向促进可持续采用sap,为农民带来可持续利益。
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引用次数: 1
Determinants of bilateral trade flow between Ethiopia and its major trading partners: A gravity model approach 埃塞俄比亚与其主要贸易伙伴之间双边贸易流量的决定因素:引力模型方法
IF 0.6 Q3 Agricultural and Biological Sciences Pub Date : 2022-12-31 DOI: 10.53936/afjare.2022.17(4).24
Firomsa Mersha Tekalign, A. Mehare
This study seeks to identify the internal and external factors determining Ethiopia’s bilateral exports and total trade flows. It uses panel data covering 21 major trading partners of Ethiopia from 2000 to 2017 and estimates an augmented fixed effects gravity model. The results reveal that domestic and foreign revenues increase Ethiopia’s bilateral exports, whereas the country’s foreign direct investment and the population size of the trading partners decrease bilateral exports. The results further show that both the domestic and foreign income and similarity endowment of Ethiopia increase the country’s total trade. The study provides recommendations for the effective implementation of supply side policies to enhance trade.
本研究旨在确定决定埃塞俄比亚双边出口和贸易总额的内部和外部因素。该研究使用了2000年至2017年埃塞俄比亚21个主要贸易伙伴的面板数据,并估计了一个增强的固定效应重力模型。结果表明,国内外收入增加了埃塞俄比亚的双边出口,而该国的外国直接投资和贸易伙伴的人口规模减少了双边出口。结果进一步表明,埃塞俄比亚的国内外收入和相似性禀赋都增加了该国的贸易总额。该研究为有效实施供给侧政策以促进贸易提供了建议。
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引用次数: 0
The generalised translog cost function to estimate tariffs for potable water: The case of Tunisia 估计饮用水价格的广义超对数成本函数:突尼斯的案例
IF 0.6 Q3 Agricultural and Biological Sciences Pub Date : 2022-12-31 DOI: 10.53936/afjare.2022.17(4).23
tawfik ben amor
The present study aims to estimate the marginal cost of potable water supply and analyse the implications for more efficient, equitable and income-adequate tap water tariffs in Tunisia. Furthermore, this article aims to develop a new pricing model for potable water. Pricing by the Tunisian water utility focuses on setting water prices to cover average costs, often using designs that increase clogging rates. This results in a large volume of potable water being wasted. To facilitate the efficient estimation of pricing models, we attempt to introduce generalised translog (GT) cost specifications for multiple products including Box-Cox transformations. It turns out that the marginal social cost of providing a cubic meter of water must consist of two components: volumetric charges, at €0.048/m3 , and connection water charges, of €0.055/km.
本研究的目的是估计饮用水供应的边际成本,并分析对突尼斯更有效、公平和收入充足的自来水收费的影响。此外,本文旨在建立一种新的饮用水定价模型。突尼斯水务公司的定价侧重于设定水价以覆盖平均成本,通常采用增加堵塞率的设计。这导致大量的饮用水被浪费。为了促进定价模型的有效估计,我们尝试为包括Box-Cox变换在内的多种产品引入广义超对数(GT)成本规范。事实证明,提供一立方米水的边际社会成本必须由两部分组成:体积费,每立方米0.048欧元,连接水费,每公里0.055欧元。
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引用次数: 0
Pastoral livestock market integration amidst improvements in physical and communication infrastructure: Evidence from northern Kenya 在有形和通信基础设施改善的背景下,畜牧市场一体化:来自肯尼亚北部的证据
IF 0.6 Q3 Agricultural and Biological Sciences Pub Date : 2022-12-31 DOI: 10.53936/afjare.2022.17(4).22
P. Chelanga, N. Jensen, Kavoi Mutuku Muendo
This article analyses the level of integration in pastoral markets in Kenya using high-frequency data generated through a crowdsourcing endeavour. The vector error-correction model framework was used to estimate the causal relationships between the short- and long-run market price. The results indicate that a higher proportion of price variation in larger markets in the region was due to market price shocks, while variation in the smaller markets originated from the larger markets. Weekly adjustments and the convergence of prices on a long-run equilibrium after experiencing shocks were also observed. Price transmission was also evident between markets operating along different trading routes. However, markets located close to production catchments exhibited lower price trends, despite being connected. These results suggest a strong influence of the recent infrastructural investments on price transmission between markets in the region. The findings imply that more investments would enhance the competitive trading environment and reduce unidirectional price transmission.
本文使用通过众包努力产生的高频数据分析了肯尼亚畜牧市场的整合水平。采用向量误差修正模型框架估计了短期和长期市场价格之间的因果关系。结果表明,该地区较大市场的价格波动比例较高是由于市场价格冲击,而较小市场的价格波动源于较大市场。在经历冲击后,每周的调整和价格在长期均衡上的趋同也被观察到。沿着不同贸易路线运作的市场之间的价格传递也很明显。然而,位于生产集水区附近的市场尽管相互连接,但价格趋势较低。这些结果表明,最近的基础设施投资对该地区市场之间的价格传递有很大影响。研究结果表明,更多的投资将增强竞争交易环境,减少单向价格传导。
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引用次数: 0
期刊
African Journal of Agricultural and Resource Economics-AFJARE
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