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Introduction to the special issue in honor of the late Dr. James Rude 纪念已故詹姆斯-鲁德博士特刊导言
IF 2.5 2区 经济学 Q2 AGRICULTURAL ECONOMICS & POLICY Pub Date : 2024-08-28 DOI: 10.1111/cjag.12373
Derek Brewin, Ryan Cardwell, Alan P. Ker
<p>Dr. James Rude, colleague and friend, died in May of 2022. James was raised on a grain farm in Birch Hills, Saskatchewan and earned a BA and a MA in Economics from the University of Saskatchewan. He served as a lecturer at the University of Saskatchewan, starting in 1982. In 1984 he began working at SaskTel before moving to the trade secretariate with the Saskatchewan provincial government. In 1993, he earned a PhD in Agricultural Economics at the University of Guelph, after which he worked on trade policy at Agriculture and Agri-Food Canada. James also worked as a researcher at the University of Saskatchewan and at Iowa State University. James was hired as an Assistant Professor at the University of Manitoba in 2002 and moved to the University of Alberta's Department of Resource Economics and Environmental Sociology in 2007, where he spent his last 15 years. Many economists who worked with James grew accustomed to in-depth discussions of agricultural issues with him and felt a significant personal and professional loss after his passing. He was the go-to person in our profession for information about current and historical institutions governing Canadian agricultural policy. To honor James’ contributions and foster his brand of economic analysis, the <i>Canadian Journal of Agricultural Economics</i> commissioned a special issue on current issues in agricultural economics inspired by his work.</p><p>James’ research interests were broad; he contributed to the analysis of a wide range of issues in applied economics. The wide range of articles in this special issue reflect the broad reach of James’ research and policy work.</p><p>The first group of papers focuses on policy interventions and rent seeking. Vercammen (<span>2024</span>) investigates the time-series properties of agricultural TFP growth, and provocatively challenges the commonly-held view that slower agricultural TFP growth can be attributed to declining public R&D expenditures. Wichman (<span>2024</span>) investigates bidding behavior in conservation auctions; Barichello et al. (<span>2024</span>) generate a model to estimate quota values in Canada's dairy market; Cardwell and Biden (<span>2024</span>) analyze compensation payments to producers in Canada's supply-managed industries in the wake of recent trade agreements.</p><p>The second group of papers is related to farm-level production and management decisions. McKnight et al. (<span>2024</span>) develop a model to understand how producers of bioenergy feedstocks respond to changes in relative crop prices; De Laporte et al. (<span>2024</span>) investigate how Canada's suite of BRM programs affect farmers’ decisions to undertake GHG-emission reducing practices; Larue and Ker (<span>2024</span>) model how climate-related production shocks affect Canadian apple production and trade flows.</p><p>The third group of papers analyses market power and price transmission in agricultural supply chains. Singbo and Sossou (<span>2024</spa
詹姆斯-鲁德(James Rude)博士是我的同事和朋友,于 2022 年 5 月去世。詹姆斯在萨斯喀彻温省桦树山的谷物农场长大,并获得萨斯喀彻温大学经济学学士和硕士学位。从 1982 年开始,他在萨斯喀彻温大学担任讲师。1984 年,他开始在萨斯喀彻温省电信公司工作,之后转入萨斯喀彻温省政府贸易秘书处。1993 年,他获得圭尔夫大学农业经济学博士学位,之后在加拿大农业和农业食品部从事贸易政策工作。詹姆斯还曾在萨斯喀彻温大学和爱荷华州立大学担任研究员。2002 年,詹姆斯受聘担任马尼托巴大学助理教授,2007 年调入阿尔伯塔大学资源经济学和环境社会学系,并在那里度过了他最后的 15 年。许多与詹姆斯共事过的经济学家都习惯了与他一起深入讨论农业问题,他的去世让他们感受到了个人和职业上的重大损失。他是我们行业中了解加拿大农业政策现行和历史制度的最佳人选。为了纪念詹姆斯的贡献并推广他的经济分析品牌,《加拿大农业经济学杂志》受他的工作启发,委托出版了一期关于当前农业经济问题的特刊。本特刊的文章范围广泛,反映了詹姆斯研究和政策工作的广泛性。Vercammen(2024 年)研究了农业全要素生产率增长的时间序列特性,对农业全要素生产率增长放缓可归因于公共研发支出下降这一普遍观点提出了质疑。Wichman(2024 年)研究了保护性拍卖中的竞标行为;Barichello 等人(2024 年)建立了一个模型来估算加拿大乳制品市场的配额价值;Cardwell 和 Biden(2024 年)分析了在最近的贸易协定之后对加拿大供应管理行业生产者的补偿支付。McKnight 等人(2024 年)建立了一个模型,以了解生物能源原料生产者如何应对相对作物价格的变化;De Laporte 等人(2024 年)调查了加拿大的一整套生物资源管理计划如何影响农民采取温室气体减排措施的决策;Larue 和 Ker(2024 年)建立了一个模型,以了解与气候相关的生产冲击如何影响加拿大的苹果生产和贸易流动。Singbo 和 Sossou(2024 年)研究了魁北克谷物市场的市场力量如何有利于当地谷物销售商;McKendree 等人(2024 年)模拟了饲养场的产能利用率如何影响饲养牛市场的价格传递;Zheng 等人(2024 年)估计了 COVID-19 干扰对加拿大牛肉供应链的价格传递和价格波动的影响。他对加拿大农业经济学研究的影响是深远而持久的,这些论文都是在他的工作启发下完成的。詹姆斯的逝世给我们的学科和社区成员留下了一片空白。我们将继续秉承他的传统开展工作,并努力达到詹姆斯在其富有成效、影响深远的职业生涯中所设定的标准。 Introduction au numéro spécial en l'honneur du regretté Dr. James RudeLe Dr James Rude, collègue et ami, est décédé en mai 2022.James a grandi dans une ferme céréalière à Birch Hills, en Saskatchewan, et a obtenu un baccalauréat et une maîtrise en économie de l'Université de la Saskatchewan.1982 年,他开始在萨斯喀彻温大学任教。1984 年,他开始在萨斯喀彻温省电信公司(SaskTel)工作,之后重新加入萨斯喀彻温省省政府商务秘书处(secrétariat du commerce du gouvernement provincial de la Saskatchewan)。1993 年,他在圭尔夫大学获得农业经济学博士学位,之后在加拿大农业和农产品公司从事商业政治方面的工作。詹姆斯还曾在萨斯喀彻温大学和爱荷华大学担任研究员。2002 年,詹姆斯受聘为马尼托巴大学副教授;2007 年,他重返阿尔伯塔大学资源经济学和环境社会学系,并在此度过了 15 个春秋。与詹姆斯一起工作过的许多经济学家都习惯于与他就农业问题进行讨论,并在他去世后发现了他的人事和职业上的巨大损失。
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引用次数: 0
For Amber waves of grain: Commodity booms and structural transformation in 19th century America 为了琥珀谷物浪潮:19 世纪美国的商品繁荣与结构转型
IF 2.5 2区 经济学 Q2 AGRICULTURAL ECONOMICS & POLICY Pub Date : 2024-08-21 DOI: 10.1111/cjag.12372
Jeff Chan

This paper examines the effect that the export boom in wheat had on US counties from 1870 to 1900. I find that increased exports in wheat, exogenously driven by declines in British wheat production, led to an unequal effect on wheat production across counties. Specifically, counties that were less well-suited to wheat production increased their wheat output relative to more productive counties. These low-yield counties also reduced their urban population share and increased the amount of agricultural activity occurring within their borders. Taken together, my results suggest that the wheat boom in 19th century America led to more wheat production in counties which were less well-suited for growing it, which slowed these counties' transition from rural to urban.

本文研究了 1870 年至 1900 年小麦出口热潮对美国各县的影响。我发现,在英国小麦产量下降的外因推动下,小麦出口的增加对各县的小麦产量产生了不平等的影响。具体而言,相对于产量较高的县,不太适合小麦生产的县增加了小麦产量。这些低产县还减少了城市人口比例,增加了其境内的农业活动量。综合来看,我的研究结果表明,19 世纪美国的小麦热潮导致不适合种植小麦的县的小麦产量增加,从而减缓了这些县从农村向城市的过渡。
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引用次数: 0
Asymmetric spot-futures prices adjustments in Quebec grain markets 魁北克谷物市场不对称的现货期货价格调整
IF 2.5 2区 经济学 Q2 AGRICULTURAL ECONOMICS & POLICY Pub Date : 2024-07-22 DOI: 10.1111/cjag.12370
Alphonse Singbo, Dislène Sossou

Asymmetric price transmission has been the subject of many studies in agricultural economics, but few has been said on Quebec grain market. This study uses threshold cointegration models to examine the dynamic relationship between Quebec spot and futures prices. Estimation results with daily, weekly, and monthly data from September 1994 to May 2022 are three-fold. First, the main point to keep from cointegration tests is that futures prices and Quebec local grain prices are integrated but estimations with daily data are consistent to highlight a nonlinear long-run relationship. Second, results indicate overall positive asymmetric for daily and weekly prices transmissions from futures to spot market. Third, the positive asymmetric prices transmissions shed light on the oligopoly structure of Quebec grain market and inefficiencies in the pricing mechanism which favor local grain sellers. Results with different data frequencies show that aggregated monthly prices data compared to more disaggregated data such as daily and weekly prices may lead to different results. Results imply that policymakers and market stakeholders could facilitate increased grain market competition. Grain users like Quebec hog producers need to better understand additional tools for their management of price risk like futures market and real time prices movement monitoring.

非对称价格传导一直是农业经济学的研究主题,但有关魁北克谷物市场的研究却很少。本研究使用阈值协整模型来考察魁北克现货和期货价格之间的动态关系。利用 1994 年 9 月至 2022 年 5 月的每日、每周和每月数据进行的估计结果有三个方面。首先,协整检验的要点是期货价格和魁北克当地谷物价格是一体化的,但每日数据的估计结果是一致的,突出了非线性的长期关系。其次,结果表明,从期货市场到现货市场的每日和每周价格传输总体上是正非对称的。第三,正的非对称价格传递揭示了魁北克谷物市场的寡头垄断结构,以及有利于当地谷物销售商的定价机制的低效率。不同数据频率的结果表明,月度综合价格数据与更细分的数据(如日价格和周价格)相比,可能会导致不同的结果。结果表明,政策制定者和市场利益相关者可以促进谷物市场竞争的加剧。魁北克生猪生产商等谷物用户需要更好地了解期货市场和实时价格走势监测等其他价格风险管理工具。
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引用次数: 0
Milk, money, and gender: Exploring the link between women's decision-making in dairy production and welfare investments in boys versus girls 牛奶、金钱和性别:探索妇女在乳制品生产中的决策与对男孩和女孩的福利投资之间的联系
IF 2.5 2区 经济学 Q2 AGRICULTURAL ECONOMICS & POLICY Pub Date : 2024-07-22 DOI: 10.1111/cjag.12368
Jessie Lin, Meike Wollni

Greater women's bargaining power and decision-making within a household have been shown to increase investments in human capital. This study links women's participation in decision-making in dairy production with household investment in girls and boys in health, nutrition, and education. We survey households in the urbanizing region of Bangalore, India. We utilize a multinomial treatment effects model to analyze the individual and household factors that are associated with women's participation in sole or joint decision-making. We then assess how the type of decision-making influences a household's investments. The results first show that female decision-making households are more disadvantaged on average than other types of decision-making households. Second, we observe that female decision-makers for dairy production are more likely to have more children and earn a higher income than their husbands. Third, the main findings show that households in which women engage in joint decision-making have higher levels of investment across all categories for girls. Conversely, investments decrease in education and nutrition for both girls and boys when the wife is the sole decision-maker. Lastly, investments are enhanced further for girls when households can sell milk at a higher price.

事实证明,妇女在家庭中更大的议价权和决策权可增加对人力资本的投资。本研究将妇女参与乳制品生产决策与家庭对女孩和男孩在健康、营养和教育方面的投资联系起来。我们对印度班加罗尔城市化地区的家庭进行了调查。我们利用多项式处理效应模型来分析与妇女参与单独或共同决策相关的个人和家庭因素。然后,我们评估了决策类型对家庭投资的影响。结果首先表明,与其他类型的决策家庭相比,女性决策家庭平均处于更不利的地位。其次,我们观察到,乳制品生产的女性决策者更有可能比她们的丈夫生育更多的孩子,收入也更高。第三,主要研究结果表明,在妇女参与共同决策的家庭中,女孩在所有类别中的投资水平都较高。相反,如果妻子是唯一的决策者,女孩和男孩在教育和营养方面的投资都会减少。最后,当家庭能够以更高的价格出售牛奶时,女孩的投资会进一步增加。
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引用次数: 0
Using the evolution of knowledge to explain changes in farm size distribution and specialization 用知识的演变解释农场规模分布和专业化的变化
IF 2.5 2区 经济学 Q2 AGRICULTURAL ECONOMICS & POLICY Pub Date : 2024-07-17 DOI: 10.1111/cjag.12371
Hanlin Wei

This study developed a theoretical model to explain the consolidation of farmland and specialization in agriculture. In the model, farmers are assumed to be endowed with knowledge regarding the production of each crop, which evolves through learning. Knowledge across crops is substitutable to various degrees. The farm size distribution and specialization are shown to be equilibrium outcomes determined by the distribution of knowledge. A simulation example based on farm-level acreage data from California is presented to show the relevance of learning mechanisms and test model implications.

本研究建立了一个理论模型来解释耕地整合和农业专业化。在该模型中,假定农民拥有关于每种作物生产的知识,这些知识通过学习不断发展。不同作物的知识具有不同程度的可替代性。农场规模分布和专业化被证明是由知识分布决定的均衡结果。本文以加利福尼亚州农场一级的种植面积数据为基础,提出了一个模拟实例,以说明学习机制的相关性并检验模型的含义。
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引用次数: 0
Are milk quota prices a rational investment? Modeling quotas as financial assets 牛奶配额价格是理性投资吗?将配额作为金融资产建模
IF 2.5 2区 经济学 Q2 AGRICULTURAL ECONOMICS & POLICY Pub Date : 2024-07-12 DOI: 10.1111/cjag.12369
Richard R. Barichello, James Vercammen, Benjamin Zammit-Maempel

Our objective in this paper is to examine the growth of the price of farm milk quotas in Canada, to shed light on their patterns of growth within the last 15 years. Our quota price model is based on the Gordon growth model, supplemented by some important characteristics of the milk quota market. Our explanatory variables include the quota rental price, interest rate, and expectations of both price and quantity growth, all for the province of Alberta over the 2009–2023 time period. Our economic model of quota prices performs well by giving results with the predicted signs for all variables in our model and high levels of statistical significance except for expectations of quantity allocations when entered separately. The model has two variants, one with the expectation of growth in quota rents and the other with the expectation of growth in the quota asset price. Econometric issues related to time series problems are dealt with. The model allows calculation of policy risk, which shows an interesting pattern over this time period.

本文旨在研究加拿大农场牛奶配额价格的增长情况,以揭示其在过去 15 年中的增长模式。我们的配额价格模型以戈登增长模型为基础,辅以牛奶配额市场的一些重要特征。我们的解释变量包括阿尔伯塔省 2009-2023 年期间的配额租赁价格、利率以及价格和数量增长预期。我们的配额价格经济模型表现出色,模型中的所有变量都出现了预测的符号,而且除了单独输入数量分配预期外,其他变量都具有较高的统计显著性。该模型有两个变体,一个是配额租金增长预期,另一个是配额资产价格增长预期。处理了与时间序列问题有关的计量经济学问题。该模型可以计算政策风险,在这一时期显示出一种有趣的模式。
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引用次数: 0
Climate change, production and trade in apples 气候变化、苹果生产和贸易
IF 2.5 2区 经济学 Q2 AGRICULTURAL ECONOMICS & POLICY Pub Date : 2024-06-29 DOI: 10.1111/cjag.12367
Bruno Larue, Alan P. Ker

In this paper, we investigate the impacts of climate extremes on the production and trade of apples. Apple production being notoriously sensitive to climate shocks, we show that March and April temperatures and precipitations beyond estimated thresholds cause large yield reductions in Quebec and Ontario. In years when climate shocks are large and highly correlated across space, large variations in national production cause major variations in trade flows. Hence, we exploit the theoretical foundations of a sectoral structural gravity model to implement counterfactual trade experiments about harvest shocks in Canada and the United States. We report changes in tariffs, imports, exports, farmgate prices, and in consumer welfare. The shocks greatly impact trade between North American countries but have little impact on other countries except for Chile and New Zealand which see their exports grow.

在本文中,我们研究了极端气候对苹果生产和贸易的影响。苹果生产对气候冲击的敏感度是众所周知的,我们的研究表明,3 月和 4 月的气温和降水量超过估计的临界值会导致魁北克和安大略的苹果大幅减产。在气候冲击较大且跨空间高度相关的年份,全国产量的巨大变化会导致贸易流量的重大变化。因此,我们利用部门结构重力模型的理论基础,对加拿大和美国的收成冲击进行了反事实贸易实验。我们报告了关税、进口、出口、农场交货价格和消费者福利的变化。冲击极大地影响了北美国家之间的贸易,但对其他国家的影响很小,只有智利和新西兰的出口出现增长。
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引用次数: 0
Signaling sustainability: Do Canadian consumers prefer broad or narrow food sustainability labels? 可持续发展的信号:加拿大消费者喜欢宽泛还是狭窄的食品可持续性标签?
IF 2.5 2区 经济学 Q2 AGRICULTURAL ECONOMICS & POLICY Pub Date : 2024-06-22 DOI: 10.1111/cjag.12366
Yang Yang, Jill E. Hobbs, Megan Fulmes, Stuart J. Smyth

Sustainability labeling has been increasingly integrated into many food product labels in response to consumer interest in purchasing sustainably produced food. While a product label may contain the phrase “sustainably produced”, little additional information is available to consumers regarding how sustainability has been enhanced, or the dimensions of sustainability encompassed by the label. Using data from a survey of 1416 Canadian consumers, we examine consumer perceptions of sustainability and preferences for broad versus narrow sustainability claims across several contexts, including the dimensions of sustainability and the scope of a sustainability standard with respect to compliance criteria, product coverage, and geographical coverage. We find low levels of consumer knowledge and understanding of sustainability labeling, heterogeneity with respect to which dimension of sustainability appeals to different types of consumers, and a general preference for broad over narrowly defined sustainability labels, particularly with respect to the scope of criteria encompassed by the label. Our findings suggest some confusion as to what constitutes sustainability in the context of agri-food, but that broader, more encompassing labels are likely to gain more traction with consumers.

为了满足消费者对购买可持续生产食品的兴趣,可持续性标签越来越多地被纳入许多食品标签中。虽然产品标签上可能包含 "可持续生产 "的字样,但消费者几乎无法获得更多有关如何提高可持续性或标签所包含的可持续性维度的信息。利用对 1416 名加拿大消费者的调查数据,我们研究了消费者对可持续性的看法,以及在几种情况下对广义和狭义可持续性声明的偏好,包括可持续性的维度和可持续性标准在合规标准、产品覆盖范围和地理覆盖范围方面的范围。我们发现,消费者对可持续发展标签的了解和理解程度较低,不同类型的消费者对可持续发展的哪个维度具有吸引力存在差异,而且消费者普遍倾向于广义的可持续发展标签,而不是狭义的可持续发展标签,特别是在标签所涵盖的标准范围方面。我们的研究结果表明,在农业食品方面,人们对什么是可持续性存在一些困惑,但更广泛、更全面的标签可能会获得消费者更多的青睐。
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引用次数: 0
Explaining consumer willingness to pay for country-of-origin labeling with ethnocentrism, country image, and product image: Examples from China's beef market 用民族中心主义、国家形象和产品形象解释消费者为原产国标签付费的意愿:以中国牛肉市场为例
IF 9 2区 经济学 Q2 AGRICULTURAL ECONOMICS & POLICY Pub Date : 2024-05-14 DOI: 10.1111/cjag.12359
Shijun Gao, Carola Grebitus, Karen L. DeLong

Chinese beef imports have been increasing in recent years. At the same time, Chinese public sentiment toward foreign countries, including those who export beef to China, has been changing. Therefore, this research uses a discrete choice experiment (DCE) to investigate the role of ethnocentrism, country image, and product image on consumer willingness to pay for country-of-origin labeled beef. Results indicate, on average, Chinese consumers prefer domestic beef most, and value beef from Australia and the US somewhat similarly. Their willingness to pay varies based on their perceived image of the country that the beef originates from and based on their perception of the safety of the beef, that is, product image. The more ethnocentric consumers are, the more they prefer domestic beef and discount foreign beef. Importantly, the effects of ethnocentrism, country image, and product image are stronger on the willingness to pay for domestic beef than for imported beef. More generally, findings indicate that controlling for ethnocentrism, country image, and product image contributes to understanding consumer willingness to pay for products originating from foreign countries. Overall, findings suggest that stronger ethnocentric tendencies lead to lower willingness to pay for imported beef (with some exceptions), and positive country image and product image increase the willingness to pay for imported beef. Thus, it is important to consider these constructs when estimating consumer willingness to pay for imported products, especially for countries where public sentiment toward exporting countries may be prone to change in a dynamic global environment.

近年来,中国牛肉进口量不断增加。与此同时,中国公众对外国(包括对华出口牛肉的国家)的情感也在发生变化。因此,本研究采用离散选择实验(DCE)来研究民族中心主义、国家形象和产品形象对消费者购买原产地标记牛肉的支付意愿的影响。研究结果表明,平均而言,中国消费者最喜欢国产牛肉,对澳大利亚和美国牛肉的评价也差不多。他们的支付意愿因对牛肉原产国形象的感知和对牛肉安全性的感知(即产品形象)而异。消费者的民族中心主义程度越高,他们就越偏爱国产牛肉,而对外国牛肉不屑一顾。重要的是,与进口牛肉相比,民族中心主义、国家形象和产品形象对国产牛肉支付意愿的影响更大。更广泛地说,研究结果表明,控制民族中心主义、国家形象和产品形象有助于了解消费者对原产于外国的产品的支付意愿。总体而言,研究结果表明,较强的民族中心主义倾向会导致消费者对进口牛肉的支付意愿降低(但也有例外),而积极的国家形象和产品形象则会提高消费者对进口牛肉的支付意愿。因此,在估算消费者对进口产品的支付意愿时,考虑这些因素非常重要,尤其是对于公众对出口国的情绪在动态的全球环境中可能容易发生变化的国家。
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引用次数: 0
Heterogeneous impact of crop diversification on farm net returns and risk exposure: Empirical evidence from Ghana 作物多样化对农场净收益和风险敞口的异质性影响:来自加纳的经验证据
IF 2.5 2区 经济学 Q2 AGRICULTURAL ECONOMICS & POLICY Pub Date : 2024-05-10 DOI: 10.1111/cjag.12360
Baba Adam, Awudu Abdulai

Increasing frequency of extreme weather events threatens the livelihoods of low-income farm households due to the heavy dependence on rain-fed agriculture coupled with the under-developed formal markets for risk management products. Thus, crop diversification is one of the widely used ex ante adaptation strategies to hedge against weather risk exposure. In this study, we use survey data from the northern Savanna zone of Ghana merged with historical weather data to shed light on the heterogeneous impact of crop diversification on farm net returns and risk exposure. We employ the dose response function and instrumental variable techniques to address potential endogeneity concerns. Overall, our findings show that crop diversification is a welfare-enhancing strategy that significantly increases farm net returns, lowers the probability of crop failure, and thus decreases downside risk exposure. Notably, our dose-response function analysis demonstrates that the positive benefits of crop diversification are particularly pronounced at lower intensities, reaching an optimal threshold. Beyond this point, the incremental advantages tend to diminish, suggesting the importance of carefully considering the optimal level of diversification for maximum benefits. The results further underscore the significant impact of both access to agricultural extension services and fertilizer usage on the adoption of crop diversification.

由于严重依赖雨水灌溉的农业,加上风险管理产品的正规市场不发达,极端天气事件日益频繁,威胁着低收入农户的生计。因此,作物多样化是广泛使用的事前适应策略之一,以规避天气风险。在本研究中,我们利用加纳北部热带草原区的调查数据与历史天气数据相结合,揭示了作物多样化对农场净收益和风险敞口的不同影响。我们采用剂量反应函数和工具变量技术来解决潜在的内生性问题。总体而言,我们的研究结果表明,作物多样化是一种提高福利的策略,它能显著提高农场净收益,降低作物歉收的概率,从而降低下行风险敞口。值得注意的是,我们的剂量-反应函数分析表明,作物多样化的积极效益在较低的强度下尤为明显,达到最佳阈值。超过这个临界点,增量优势就会逐渐减弱,这表明必须仔细考虑多样化的最佳水平,以获得最大效益。研究结果进一步强调了获得农业推广服务和使用化肥对采用作物多样化的重要影响。
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引用次数: 0
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Canadian Journal of Agricultural Economics-Revue Canadienne D Agroeconomie
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