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Success criteria for commodity exchanges 商品交易的成功标准
IF 0.6 Q3 Agricultural and Biological Sciences Pub Date : 2020-07-01 DOI: 10.22004/AG.ECON.307624
J. Roche
The starting point for this article is the concept of a commodity exchange. A working definition is a physical or – more likely – electronic marketplace for buying, selling and trading commodities, whether ‘hard’ commodities, which typically are natural resources that must be mined or extracted (gold, rubber, oil, etc.), or ‘soft’ commodities, which are mainly agricultural products or livestock (coffee, corn, cotton, sugar, soybeans, etc.). The purpose of the exchange is to provide an organised and reliable marketplace where exchange members can trade commodities on behalf of their clients, which can range from farmers to speculators. Some exchanges trade commodities for spot or forward delivery, whilst others provide futures and options, where deliveries are rare or settlement is in cash (Gross 2014). Most exchanges operate under a national regulatory framework approved by government. Exchanges matter because they act as intermediaries, removing credit risk between their members by interposing themselves between buyers and sellers.
本文的出发点是商品交换的概念。一个有效的定义是购买、销售和交易商品的物理或更有可能是电子市场,无论是“硬”商品,通常是必须开采或提取的自然资源(黄金、橡胶、石油等),还是“软”商品,主要是农产品或牲畜(咖啡、玉米、棉花、糖、大豆等)。交易所的目的是提供一个有组织和可靠的市场,交易所成员可以代表他们的客户进行商品交易,这些客户可以从农民到投机者。一些交易所交易商品现货或远期交割,而其他交易所提供期货和期权,其中交割很少或以现金结算(Gross 2014)。大多数交易所在政府批准的国家监管框架下运营。交易所之所以重要,是因为它们充当中介,通过介入买卖双方,消除成员之间的信用风险。
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引用次数: 0
Contrat de travail et performance des exploitations cacaoyères dans le Mbam et Kim au Cameroun 喀麦隆Mbam和Kim可可农场的雇佣合同和绩效
IF 0.6 Q3 Agricultural and Biological Sciences Pub Date : 2020-06-30 DOI: 10.53936/afjare.2020.15(2).08
André Nso Ngang, Cyrille Bergaly Kamdem, Christian Bernard Kaldjob Mbeh, Philippe Pédelahore, D. Onana, Joséphine Mireille Akoa Etoa
Dans le but d’appréhender l’influence des types de contrat de travail sur les performances des exploitations cacaoyères dans le Mbam et Kim au Cameroun, un échantillonnage raisonné a permis de sélectionner 114 exploitants cacaoyers. L’approche à deux étapes recourant aux modèles Data Enveloppent Analysis (DEA) et Tobit censuré a permis d’analyser l’efficacité des exploitations. Deux types de contrat ont été identifiés: le contrat annuel fixe (CAF) et le contrat par pourcentage de vente (CPV) de cacao récolté. Les résultats montrent que le CPV semble plus performant par rapport au CAF en termes de productivité et de d’allocation. Par ailleurs, l’augmentation de la superficie des exploitations, du nombre de défrichements et le traitement mixte sont les facteurs qui contribuent mieux à l’inefficacité de ces cacaoyères, tandis que la récolte sanitaire, l’augmentation du nombre de réglages d’ombrage et des tailles du cacaoyer sont sources d’efficacité.
为了了解雇佣合同类型对喀麦隆MMFA和KIM可可农场绩效的影响,对114名可可农民进行了合理抽样。使用数据包络分析(DEA)和TOBIT审查模型的两步方法分析了运营效率。确定了两种类型的合同:收获可可的固定年度合同(CAF)和销售百分比合同(CPV)。结果表明,在生产率和分配方面,CPV似乎比CAF表现更好。此外,增加农场面积、清理次数和混合处理是导致这些可可树效率低下的最佳因素,而卫生收获、增加遮荫设置和可可树大小是效率的来源。
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引用次数: 0
Does crop diversification reduce downside risk of external maize yield-enhancing technology? Evidence from Ethiopia 作物多样化是否降低了外部玉米增产技术的下行风险?来自埃塞俄比亚的证据
IF 0.6 Q3 Agricultural and Biological Sciences Pub Date : 2020-06-30 DOI: 10.53936/afjare.2020.15(2).07
M. Jaleta, P. Marenya, B. Beshir, O. Erenstein
Unexpectedly lower yield outcomes (downside risks) challenge farmers’ use of external inputs that can enhance crop productivity. Using household-level panel data collected from Ethiopia, we estimated the effects of crop diversification through maize-legume intercropping/rotation on maize yield distribution and downside risk. Results from endogenous switching regression models and quintile moment approaches show that plots with maize-legume intercropping/rotation have the highest average maize yield. Such crop diversification reduces the downside risk in maize yield more when applied to plots receiving external inputs. The results imply that, in addition to the technical support around external input use in smallholder maize production, Ethiopia’s agricultural extension may also need to give due emphasis to both spatial and temporal crop diversification practices. This could enhance crop productivity further and reduce the potential downside risks typically hampering smallholders’ external input use in maize production.
出乎意料的低产量结果(下行风险)挑战了农民使用可以提高作物生产力的外部投入。利用从埃塞俄比亚收集的家庭层面的面板数据,我们估计了通过玉米-豆类间作/轮作实现作物多样化对玉米产量分布和下行风险的影响。内生转换回归模型和五分位数矩方法的结果表明,玉米-豆类间作/轮作小区的玉米平均产量最高。当应用于接受外部投入的地块时,这种作物多样化可以更多地降低玉米产量的下行风险。研究结果表明,除了围绕小农户玉米生产的外部投入使用提供技术支持外,埃塞俄比亚的农业推广可能还需要适当重视作物的空间和时间多样化做法。这可以进一步提高作物生产力,减少通常阻碍小农户在玉米生产中使用外部投入的潜在下行风险。
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引用次数: 4
Success Criteria for Commodity Exchanges 商品交易所的成功标准
IF 0.6 Q3 Agricultural and Biological Sciences Pub Date : 2020-06-30 DOI: 10.53936/afjare.2020.15(2).09
Julian Spencer Roche
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引用次数: 0
Governance structures and incentives in the wheat value chain in Ethiopia 埃塞俄比亚小麦价值链中的治理结构和激励措施
IF 0.6 Q3 Agricultural and Biological Sciences Pub Date : 2020-06-30 DOI: 10.22004/AG.ECON.307627
Z. Shikur, B. Legesse, J. Haji, M. Debello
Empirical studies on the effects of governance structures on incentives have still received little attention in the wheat value chain research of developing countries. The purpose of this paper is to investigate the effects of governance structures on actors’ incentives in different functional nodes of the wheat value chain. This study used personal interviews to collect primary data from input suppliers, wheat producers, wholesalers, wheat processors and co-operatives. Mixed sampling techniques (i.e. random, census and purposive) were applied to select sampling units. Descriptive statistics and the ordered logit model were used to analyse the data. This paper found that governance structures, opportunistic behaviour, asymmetric information and trust influence actors’ incentives in each functional node of the wheat value chain. Specifically, extension services, governance structures, power relations and price information have significant and positive effects on producers’ price incentives. The study provides pioneering evidence of the effects of governance structures on incentives in each functional node of the value chain. The study adds new knowledge to the existing empirical knowledge. The results recommend government to use effective policy interventions to reduce opportunistic behaviours and asymmetric information, and to adopt incentive strategies to encourage investment, and increase productivity and profitability.
在发展中国家的小麦价值链研究中,关于治理结构对激励作用的实证研究仍然很少受到关注。本文的目的是研究治理结构对小麦价值链不同功能节点参与者激励的影响。这项研究使用个人访谈来收集来自投入供应商、小麦生产商、批发商、小麦加工商和合作社的主要数据。采用混合抽样技术(即随机抽样、普查和有目的抽样)来选择抽样单位。数据分析采用描述性统计和有序logit模型。研究发现,治理结构、机会主义行为、信息不对称和信任会影响小麦价值链各功能节点的参与者激励。具体而言,推广服务、治理结构、权力关系和价格信息对生产者的价格激励具有显著而积极的影响。该研究为治理结构对价值链每个功能节点激励的影响提供了开创性的证据。这项研究在现有经验知识的基础上增加了新的知识。研究结果建议政府采取有效的政策干预措施,减少机会主义行为和信息不对称,并采取激励策略,鼓励投资,提高生产力和盈利能力。
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引用次数: 5
Fishing location choice and risk preferences among small fishers – Implications for fisheries management policies 小渔民的捕鱼地点选择和风险偏好-对渔业管理政策的影响
IF 0.6 Q3 Agricultural and Biological Sciences Pub Date : 2020-06-30 DOI: 10.22004/AG.ECON.307626
R. Sultan
The study provides evidence for how risk preferences determine fishing location choices by artisanal fishers on the south-west coast of the island of Mauritius. Risk preference is modelled using a random linear utility framework defined over mean-standard deviation space. The study estimates expected revenue and revenue risk from the Just and Pope production function and applies the random parameter logit model to account for fisher-specific and location-specific characteristics. The findings are consistent with utility-maximising fishers, whereby the likelihood to choose a fishing location is positively associated with expected revenue and negatively related to revenue risk. Distance from fishing station to fishing grounds affects the choice of fishing location negatively. The estimated model allows heterogeneity in risk preferences and concludes that 51% of fishers can be classified as risk averse, 31% as risk seekers and the remaining as risk neutral. The study also estimates the degree of substitutability and complementarity between fishing locations based on the risk preferences of fishers and discusses the relevance of this for fisheries management policy.
这项研究为毛里求斯岛西南海岸个体渔民的风险偏好如何决定捕鱼地点选择提供了证据。风险偏好使用在平均标准差空间上定义的随机线性效用框架进行建模。该研究估计了Just和Pope生产函数的预期收入和收入风险,并应用随机参数logit模型来解释特定于渔民和特定于地点的特征。研究结果与效用最大化渔民一致,即选择捕鱼地点的可能性与预期收入呈正相关,与收入风险负相关。从捕鱼站到渔场的距离对捕鱼地点的选择产生负面影响。该估计模型允许风险偏好的异质性,并得出结论,51%的渔民可以被归类为风险厌恶型,31%的渔民可以归类为风险寻求型,其余的渔民可以分类为风险中性型。该研究还根据渔民的风险偏好估计了捕鱼地点之间的可替代性和互补性程度,并讨论了这与渔业管理政策的相关性。
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引用次数: 1
The promotion of amaranth value chains for livelihood enhancement in East Africa: A systems modelling approach 促进东非改善生计的苋菜价值链:系统建模方法
IF 0.6 Q3 Agricultural and Biological Sciences Pub Date : 2020-06-01 DOI: 10.22004/AG.ECON.307620
K. Dizyee, D. Baker, M. Herrero, H. Burrow, L. McMillan, D. Sila, K. Rich
This paper conducts ex-ante impact assessments for policy interventions to promote amaranth value chains in Tanzania and Kenya. Amaranth is an underdeveloped, drought-resistant, and nutrition-rich crop used for human food, animal fodder, and ornamental purposes. Promoting amaranth value chains is a difficult task, given that amaranth is not a well-established commodity and has limited market outlets in the developing world at present. This paper provides a framework within which conduct scenario analysis of ways to promote amaranth value chains using system dynamics (SD). We constructed an integrated amaranth production and market model to evaluate the impact of producer adoption of improved production technologies (improved seed varieties), and changes in demand for amaranth products, on producer profits and planting behaviour. The results of our model show that the profitably upgrading and commercialising of amaranth value chains require multifaceted and chain-level interventions that improve supply- and demand-side conditions. Interventions that target only the supply side serve to increase amaranth production, but generate minor economic gain for producers.
本文对坦桑尼亚和肯尼亚促进苋价值链的政策干预措施进行了事前影响评估。苋是一种不发达、耐旱、营养丰富的作物,用于人类食物、动物饲料和观赏目的。鉴于苋不是一种成熟的商品,目前在发展中国家的市场渠道有限,促进苋的价值链是一项艰巨的任务。本文提供了一个框架,在该框架内使用系统动力学(SD)对促进苋价值链的方法进行情景分析。我们构建了一个综合的苋生产和市场模型,以评估生产者采用改良生产技术(改良种子品种)以及对苋产品需求的变化对生产者利润和种植行为的影响。我们模型的结果表明,苋价值链的盈利升级和商业化需要多方面的链级干预措施,以改善供需双方的条件。仅针对供应侧的干预措施有助于提高苋的产量,但对生产商产生的经济收益很小。
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引用次数: 3
Nutritional implications of dietary patterns in Mali 马里饮食模式的营养意义
IF 0.6 Q3 Agricultural and Biological Sciences Pub Date : 2020-04-17 DOI: 10.22004/AG.ECON.303679
M. Smale, V. Thériault, Amidou Assima, Yénizié Koné
Mali’s population is experiencing lifestyle and dietary changes that are driven in part by urbanisation and income growth. Utilising two large-scale datasets, we bring new empirical evidence regarding whether Malians are shifting toward highly processed foods, meals purchased away from home, and sugary foods. We find that on-farm production represents only 25% of the food consumed by rural households during the hungry season, and 36% after harvest. Processed food shares are greater in urban (60%) than in rural areas (48%), and considerably higher overall than those reported for Eastern and Southern Africa, but with a lower portion of highly processed foods and negligible shares of meals consumed outside the home. Average household dietary diversity scores are higher in urban than in rural areas. Women’s and household diet diversity varies by season in both locations. About half of farm women interviewed did not meet minimum adequate dietary diversity during the lean season.
在城市化和收入增长的推动下,马里的人口正在经历生活方式和饮食习惯的改变。利用两个大规模数据集,我们提供了新的经验证据,证明马里人是否正在转向高度加工食品、离家购买的食品和含糖食品。我们发现,在饥饿季节,农场生产仅占农村家庭消费食物的25%,收获后为36%。城市地区的加工食品比例(60%)高于农村地区(48%),总体上比东部和南部非洲报告的比例高得多,但高度加工食品的比例较低,在家庭以外消费的膳食比例可以忽略不计。城市家庭平均饮食多样性得分高于农村地区。在这两个地区,妇女和家庭的饮食多样性因季节而异。约有一半接受采访的农场妇女在淡季没有达到最低限度的适当饮食多样性。
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引用次数: 7
La segmentation du marché urbain du riz local au Bénin: Une analyse par la méthode de classification par cluster 贝宁当地大米城市市场细分:聚类分类方法分析
IF 0.6 Q3 Agricultural and Biological Sciences Pub Date : 2020-03-30 DOI: 10.53936/afjare.2020.15(1).01
Rose Fiamohe
L’objectif de cette étude est d’identifier les segments de marchés appropriés pouvant permettre aux coopératives rizicoles de commercialiser efficacement leurs productions. Ainsi, des enchères expérimentales ont été menées en 2015 pour collecter les données auprès de 291 consommateurs urbains. La méthode de segmentation two-step cluster a permis d’identifier trois segments de marché de riz local déterminés par les caractéristiques socio-économiques et géographiques des consommateurs et les attributs du riz: le premier composé majoritairement d’hommes qui consomment le riz local en faible proportion; le deuxième composé uniquement de femmes ne consommant pas le riz local et le dernier à majorité féminine consomme exclusivement le riz local. Des actions de marketing spécifiques ciblant chacun des segments sont nécessaires pour accroître significativement la consommation du riz local et améliorer les revenus des principaux acteurs.
本研究的目的是确定适当的细分市场,使水稻合作社能够有效地销售其产品。2015年进行了实验性拍卖,收集了291名城市消费者的数据。两步集群细分法确定了由消费者的社会经济和地理特征以及大米属性决定的三个当地大米市场细分:第一个主要由男性组成,他们少量食用当地大米;第二类完全由不食用当地大米的妇女组成,最后一类主要由妇女组成,只食用当地大米。需要针对每个细分市场采取具体的营销行动,以大幅增加当地大米消费,提高主要参与者的收入。
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引用次数: 0
Impact of women’s share of income on household expenditure in southeast Nigeria 尼日利亚东南部妇女收入份额对家庭支出的影响
IF 0.6 Q3 Agricultural and Biological Sciences Pub Date : 2020-03-30 DOI: 10.53936/afjare.2020.15(1).04
P. Opata, A. Ezeibe, Chikwuma Ume
The main focus of this paper was to: (i) determine the impact of women’s share of household income on the pattern of expenditure on various categories of basic goods in southeast Nigeria; (ii) explain the pattern of household expenditure using the bargaining model of household behaviour; and (iii) extrapolate the results to the policy implications of gender-specific control of household incomes. We used cross-sectional household data elicited from a sample of 400 households constituting 2 520 members collected from November 2016 to March 2017 and disaggregated by gender. We found that increasing women’s share of incomes raises the budget share for food, children’s clothes, children’s school fees, fuel for household services and other expenditure, although not significantly with the budget shares for alcohol and meals out of the home. Our results suggest that any strategy by policymakers in southeast Nigeria to improve any of the expenditure items should target the empowerment of the gender that will more likely spend their money on the items concerned.
本文的主要重点是:(i)确定妇女在家庭收入中所占份额对尼日利亚东南部各类基本商品支出模式的影响;(ii)使用家庭行为的议价模型来解释家庭支出模式;以及(iii)将结果外推到按性别控制家庭收入的政策影响。我们使用了从2016年11月至2017年3月收集的400户家庭(共2520名成员)的横断面家庭数据,并按性别分类。我们发现,增加妇女的收入份额会提高食品、童装、儿童学费、家庭服务燃料和其他支出的预算份额,尽管与外出饮酒和用餐的预算份额相比没有显著差异。我们的研究结果表明,尼日利亚东南部政策制定者改善任何支出项目的任何战略都应以增强性别权能为目标,让他们更有可能将钱花在相关项目上。
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引用次数: 4
期刊
African Journal of Agricultural and Resource Economics-AFJARE
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