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Analysis of the bulb weight of garlic with a focus on sample selection bias 大蒜鳞茎质量的分析,重点是样本选择偏差
Pub Date : 2023-06-30 DOI: 10.24997/kjae.2023.64.2.61
Seong Cheon Choi, Tongjoo Suh
To perform analyses to estimate the bulb weight of garlic, many studies have used actual survey data on garlic growth, which are constructed by periodically examining growth information. Since some individual plants may wither or necrotize during growth, sample selection bias may occur if only surviving individuals are used to estimate the bulb weight of garlic without consideration of the characteristics of individuals that drop out. In this study, the Heckit model was used to estimate the final bulb weight of garlic, with correction for non-randomly selected garlic individuals. As a result of this estimation, it was shown that the presence of garlic damage had a significant effect on survival in the selection model. Some growth variables, such as the leaf sheath and the number of leaves, were directly proportional to the final bulb weight of garlic in the outcome model, whereas variables such as planting density and the number of days of rainfall were inversely proportional to the final bulb weight.
为了进行分析以估计大蒜的鳞茎重量,许多研究使用了大蒜生长的实际调查数据,这些数据是通过定期检查生长信息构建的。由于一些单株在生长过程中可能会枯萎或坏死,如果只使用存活的个体来估计大蒜的鳞茎重量,而不考虑脱落个体的特征,可能会出现样本选择偏差。在本研究中,使用Heckit模型来估计大蒜的最终鳞茎重量,并对非随机选择的大蒜个体进行了校正。结果表明,在选择模型中,大蒜损伤的存在对存活有显著影响。在结果模型中,一些生长变量,如叶鞘和叶片数,与大蒜的最终鳞茎重成正比,而种植密度和降雨天数等变量与最终鳞茎重成反比。
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引用次数: 0
Measuring Beef Demand by Country of Origin and Cooking Purpose: The Multiple Discrete-Continuous Extreme Value Model Approach 按原产国和烹调目的衡量牛肉需求:多重离散-连续极值模型方法
Pub Date : 2023-06-30 DOI: 10.24997/kjae.2023.64.2.1
Yun-Sun Park, Jae Bong Chang
There has been a steady increase in the consumption of Korean beef in recent years, with the per capita consumption of beef reaching a record high in 2022. The domestic beef market provides consumers with more choices, so traditional methods of demand analysis that rely on whole beef products are likely to become less useful. Employing the multiple discrete-continuous extreme value model (MDCEV), we analyze scanner data on consumer panels over a long period. Our findings indicate Hanwoo beef demand is less price sensitive than other beef types. Furthermore, Hanwoo beef has a relatively larger cross-price elasticity than other alternatives. Consumers' income, age, and household size also significantly affect the interrelationship between demand and supply. Higher-income consumers are more likely to choose Hanwoo beef and less likely to choose imported beef. Larger families are more likely to select beef for grilling rather than cooking. These results explain current beef expenditure patterns and help understand how consumers make decisions.
近年来,韩国牛肉消费量稳步增长,2022年人均牛肉消费量创下历史新高。国内牛肉市场为消费者提供了更多的选择,因此依赖于全牛肉产品的传统需求分析方法可能会变得不那么有用。采用多重离散-连续极值模型(MDCEV),我们分析了长时间内消费者面板上的扫描仪数据。我们的研究结果表明,韩宇牛肉的需求对价格的敏感度低于其他类型的牛肉。此外,韩宇牛肉的交叉价格弹性也比其他牛肉大。消费者的收入、年龄和家庭规模也显著影响需求和供给的相互关系。高收入消费者更倾向于选择韩宇牛肉,而不太可能选择进口牛肉。大家庭更有可能选择牛肉烧烤而不是烹饪。这些结果解释了目前的牛肉消费模式,并有助于了解消费者如何做出决定。
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引用次数: 0
Can Cheap Talk Eliminate the House Money Effect in Apple Experimental Auction? 廉价言论能消除苹果实验拍卖中的房屋收益效应吗?
Pub Date : 2023-06-30 DOI: 10.24997/kjae.2023.64.2.21
Yanghyung Ryoo, Se-Hyuk Kim
In the experimental auction, participation fees can cause a house money effect that makes the value of the product higher than the actual value. The purpose of this study is to analyze whether the house money effect can be eliminated in experimental auctions by applying cheap talk used in contingent valuation and choice experiment to reduce hypothetical bias. For the analysis, an experimental auction is conducted by organizing five different auction products depending on whether or not to provide information on the taste of apples, method, color, and sugar content. The number of experimental groups is 8, and four groups provide a cheap talk, and four groups do not. The number of bidders per group is about 15, and the number of rounds is 9. The results show that it has been empirically verified that cheap talk can eliminate the house money effect. The results also indicate that as the auction round progresses, the younger the age or the lower the education level, the greater the effect of removing the house money effect of the cheap talk. Since cheap talk is easily applicable and effective, the use of cheap talk is recommended in studies using experimental auction.
在实验拍卖中,参与费会产生房屋货币效应,使产品的价值高于实际价值。本研究的目的是通过运用或有估价和选择实验中的廉价话来减少假设偏差,分析在实验拍卖中房屋货币效应是否可以消除。为了进行分析,根据是否提供苹果的味道、制作方法、颜色、含糖量等信息,组织了5种不同的拍卖产品,进行了实验拍卖。实验小组的数量为8个,其中4组提供廉价谈话,4组不提供。每组投标人数约为15人,轮数为9轮。研究结果表明,通过实证验证了廉价谈话可以消除房屋资金效应。研究结果还表明,随着拍卖回合的进行,年龄越小或受教育程度越低的人,廉价话对消除房款效应的作用越大。由于廉价话容易适用和有效,因此建议在使用实验拍卖的研究中使用廉价话。
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引用次数: 0
Assessing the effects of changes in Hanwoo breeding cow population on equilibrium using Multimarket Partial Equilibrium model 利用多市场部分均衡模型评估韩宇种牛种群变化对均衡的影响
Pub Date : 2023-06-30 DOI: 10.24997/kjae.2023.64.2.43
Minkyoung Kim, Hong-Sung Mun, Kyeong-Soo Jeong
A vertically integrated structure was considered in developing a Multimarket Partial Equilibrium Model for the Hanwoo industry. In order to eliminate the supply effect on the final demand for Hanwoo beef, Hanwoo beef demand index was constructed and integrated into the model. Using simulations that altered the number of breeding cows, the model was utilized to examine the ripple effect on equilibrium quantity and price, which are crucial in regulating the supply and demand of Korean beef. The study found that altering the number of breeding cows affected the feeder and fed cattle markets depending on the timing of the alteration to the breeding cow population. Fattening breeding cows is a significant tool that directly impacts market equilibrium but caution is needed when implementing this policy as it cannot be considered a fundamental measure for stabilizing the Hanwoo supply.
在建立韩宇产业的多市场部分均衡模型时,考虑了垂直整合结构。为了消除供给对韩牛最终需求的影响,构建了韩牛需求指数,并将其纳入模型。通过模拟改变繁殖牛的数量,该模型被用来研究对平衡数量和价格的连锁反应,这对调节韩国牛肉的供需至关重要。研究发现,改变种牛的数量会影响饲养者和饲料牛市场,这取决于改变种牛数量的时间。让奶牛增肥是直接影响市场均衡的重要手段,但这并不是稳定韩雨供应的根本措施,因此在实施过程中应慎重。
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引用次数: 0
The potential of the mobile application as a food waste reduction alternative 移动应用程序作为减少食物浪费替代方案的潜力
Pub Date : 2023-06-30 DOI: 10.24997/kjae.2023.64.2.77
Yeona Hong, Chanmi Yun
This study aims to analyze the impact of using ‘Last Order’, a mobile application that provides a discount service for near-expiry food, on food waste reduction, and to verify whether food redistribution through such a platform can be an effective alternative to proactively reducing domestic food waste. A survey was conducted among 216 ‘Last Order’ users and 376 non-users, of which 469 respondents(136 users and 333 non-users), excluding single-person households, were used for the analysis. The results of the analysis showed that the variable ‘whether or not to use the application which discounts service for near-expiry food’ had a significant negative value, indicating that the use of the application contributed to a reduction in the amount of food waste generated per household per day. It implies that increased use of the application will increase the potential for reducing food waste through the consumption of near-expiry food from retailers to households.
本研究旨在分析使用“Last Order”(一款为即将过期的食品提供折扣服务的移动应用程序)对减少食物浪费的影响,并验证通过该平台重新分配食物是否可以成为主动减少家庭食物浪费的有效替代方案。对216名“Last Order”用户和376名非用户进行了调查,其中469名受访者(136名用户和333名非用户)被用于分析,不包括单身家庭。分析结果表明,变量“是否使用该应用程序为即将过期的食品提供折扣服务”具有显著的负值,这表明该应用程序的使用有助于减少每户家庭每天产生的食物浪费量。这意味着增加应用程序的使用将增加通过从零售商到家庭消费接近过期食品来减少食物浪费的潜力。
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引用次数: 0
Are Efficient and Inefficient Farms Heterogeneous? Evidence from Kansas Farms 高效农场和低效农场是异质的吗?来自堪萨斯农场的证据
Pub Date : 2023-03-30 DOI: 10.24997/kjae.2023.64.1.103
Youngjune Kim, Bowen Chen, Allen M. Featherstone, D. Pendell
Most of the previous literature on efficiency assumes that efficient and inefficient farms are homogeneous in production, even though they may have different strategies to increase efficiency. Exploiting Super Data envelopment analysis (DEA) and quantile regression, this study examines the sources of efficiency with particular consideration of the heterogeneity between efficient and inefficient farms using a farm-level dataset. The results show that an increase in some farm characteristics, such as the number of beef cows, percentage of income from beef cows, and percentage of acres owned, affects efficiency in different ways for efficient and inefficient farms. These results imply that efficient and inefficient farms are heterogeneous in terms of how farm characteristics affect efficiency.
以前大多数关于效率的文献都假设高效和低效的农场在生产上是同质的,即使它们可能有不同的提高效率的策略。本研究利用超级数据包络分析(DEA)和分位数回归,利用农场层面的数据集,特别考虑了高效和低效农场之间的异质性,考察了效率的来源。结果表明,一些农场特征的增加,如肉牛数量、肉牛收入百分比和拥有的土地百分比,会以不同的方式影响高效和低效农场的效率。这些结果表明,就农场特征如何影响效率而言,高效农场和低效农场是异质的。
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引用次数: 0
Determinants of Poverty in Malawi: Evidence from the Fifth Integrated Household Survey 2019 马拉维贫困的决定因素:来自2019年第五次综合住户调查的证据
Pub Date : 2023-03-30 DOI: 10.24997/kjae.2023.64.1.67
Hyunju Oh, Taeyoon Kim
This study uses the 2019 Malawi Fifth Integrated Household Survey with 2,688 data to determine poverty factors in Malawi. Households’ subjective assessment of poverty having six levels is used with an ordered-probit model since it can easily catch deprivation in various aspects of people’s lives and complement the income-based poverty measurement for farmers in developing countries. Furthermore, consumption poverty using the annual per capita consumption value is compared with subjective poverty with a multinomial logit model. A partial proportional odds model is used as it rejects the parallel lines assumption. The overall results indicate that subjective and consumption poverty determinants overlap. But subjective poverty is more associated with household assets, natural disasters, aid, financial inclusion, food security, marital status, and education level than consumption poverty in Malawi. Policy support for continuing and developing subsidy programs for food, agricultural input, and life convenience is suggested since ongoing programs equally treat a variety of households and increase possibilities to escape both subjective and consumption poverty. Also, a rural extension program that provides asset management education is expected to draw overall welfare for vulnerable households. Finally, female welfare should be improved by reducing the wage gap and diversifying its welfare programs to improve the social perception of female labor.
本研究使用2019年马拉维第五次综合家庭调查的2688个数据来确定马拉维的贫困因素。家庭对贫困的主观评估分为六个等级,并与有序概率模型一起使用,因为它可以很容易地捕捉到人们生活各个方面的贫困情况,并补充发展中国家农民基于收入的贫困衡量。在此基础上,利用人均年消费价值对消费贫困与主观贫困进行了多项逻辑比较。采用部分比例赔率模型,因为它拒绝平行线假设。总体结果表明,主观和消费贫困决定因素重叠。但在马拉维,主观贫困更多地与家庭资产、自然灾害、援助、金融包容性、食品安全、婚姻状况和教育水平相关,而非消费性贫困。建议对持续和发展食品、农业投入和生活便利补贴项目提供政策支持,因为正在进行的项目平等地对待各种家庭,增加了摆脱主观贫困和消费贫困的可能性。另外,还将推进提供资产管理教育的农村延伸事业,为弱势家庭带来整体福利。最后,应该通过缩小工资差距和多样化福利项目来改善女性福利,以改善社会对女性劳动的认识。
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引用次数: 0
Study on the effect of rural seniors’ labor force participation on health and health investment 农村老年人劳动力参与对健康和卫生投资的影响研究
Pub Date : 2023-03-30 DOI: 10.24997/kjae.2023.64.1.1
Namhoon Kim
The purpose of this study is to theoretically and empirically analyze the effect of labor force participation of rural seniors on their health and health investment. The study suggests the health investment model of old people based on the Grossman model and investigates the correlation between their labor force and health variables by using the Korean Longitudinal Study of Ageing (KLoSA) and panel data analysis model. The empirical results show that health improves when the elderly live in rural areas or participate in the labor force. However, if the seniors living in rural areas participate in the labor force, the health improvement effect was offset. Further, if the rural seniors work, they are more likely to use medical services, but less likely to attend health activity programs than those who do not work. The lack of leisure time for working rural seniors can reduce the size of health investment and worsen the health gap between rural and urban elderly. The policy authorities need to make an effort to ensure health investment opportunities for the elderly in rural areas.
本研究的目的是理论和实证分析农村老年人劳动力参与对其健康和健康投资的影响。本研究提出了基于Grossman模型的老年人健康投资模型,并采用韩国老龄化纵向研究(KLoSA)和面板数据分析模型对老年人劳动力与健康变量的相关性进行了研究。实证结果表明,老年人在农村生活或参加劳动力时,健康状况有所改善。然而,如果生活在农村地区的老年人参与劳动力,则健康改善效果被抵消。此外,如果农村老年人工作,他们更有可能使用医疗服务,但不太可能参加健康活动项目比那些不工作。农村劳动老年人缺乏闲暇时间,会降低卫生投入规模,加剧城乡老年人健康差距。政策当局需要作出努力,确保农村地区老年人的保健投资机会。
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引用次数: 0
The Impact of Abnormal Climate on the Garlic Market Using RCP Scenarios 基于RCP情景的气候异常对大蒜市场的影响
Pub Date : 2023-03-30 DOI: 10.24997/kjae.2023.64.1.25
Hyun Seon Lee, Do-Yeon Park, B. Soon
Our study investigated the impact of the implementation of greenhouse gas reduction (GGR) policies on the garlic market. We set an abnormal climate scenario; (1) emitting greenhouse gases as the current trend, (2) the greenhouse gas reductioin policy. Then, we analyzed whether the GGR policy was implemented or not. When abnormal weather occurred in 2030, Scenario 1 showed a larger decrease in yields per garlic unit than Scenario 2. On the other hand, in the case of price increase, Scenario 2 was found to be smaller than scenario 1. The results imply that if the GGR policy is implemented in abnormal climate conditions, the decrease in garlic yield per unit is relatively small due to favorable climate conditions, and it will positively contribute to stabilizing garlic prices. The results of the study suggest the need to implement GGR policies in the agricultural sector at a time when abnormal climate phenomena are inevitable. Since voluntary participation in farmers is essential to achieve carbon neutrality in the agricultural sector, policies should be implemented to increase farmers' participation rate, such as providing economic incentives when reducing greenhouse gases in the agricultural process.
本研究调查了温室气体减排(GGR)政策的实施对大蒜市场的影响。我们设定了一个异常的气候情景;(1)温室气体排放作为当前趋势;(2)温室气体减排政策。然后,我们分析了GGR政策是否得到了实施。当2030年出现异常天气时,情景1的单产降幅大于情景2。另一方面,在价格上涨的情况下,发现情景2小于情景1。结果表明,在异常气候条件下实施GGR政策,由于气候条件有利,大蒜单产下降幅度较小,对稳定大蒜价格有积极作用。研究结果表明,在异常气候现象不可避免的时候,有必要在农业部门实施GGR政策。由于农民的自愿参与对于实现农业部门的碳中和至关重要,因此应实施提高农民参与率的政策,例如在减少农业过程中的温室气体排放时提供经济激励。
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引用次数: 0
An Analysis of the Effect of Trading Countries’ Cultural Characteristics on Food Trade 贸易国文化特征对食品贸易的影响分析
Pub Date : 2023-03-30 DOI: 10.24997/kjae.2023.64.1.45
G. Cho, Tae In Im, Yoonbai Kim
The previous studies have suggested that the cultural characteristics of a country could affect consumer preference attitude toward innovation and international trade. To examine this effect, Hofstede’s multidimensional index of national culture has been popularly used. This paper focuses on the question of how the Hofstede individual cultural indices affect the international food trade using a gravity equation. The results show that the individual cultural characteristics have different effects on the food trade. An increase in the power distance, uncertainty avoidance, and masculinity index is negatively related to food exports, while an increase in the individualism and indulgence index is positively correlated with food exports. On the other hand, the power distance, and masculinity index have been positively related to the food imports, whereas individualism, uncertainty avoidance, and indulgence index have been negatively related to the food imports. Considering the magnitude of the effects in each index, we find that high uncertainty avoidance, long term orientation, and masculinity index restrain the food trade, while the high power distance index tends to increase food imports. Finally, individualism and indulgence index have a greater effect on food exports than imports.
以往的研究表明,一个国家的文化特征会影响消费者对创新和国际贸易的偏好态度。为了检验这种影响,Hofstede的多维民族文化指数被广泛使用。本文主要研究Hofstede个体文化指数如何利用重力方程影响国际食品贸易。结果表明,个体文化特征对食品贸易有不同程度的影响。权力距离、不确定性规避和男子气概指数的增加与食品出口呈负相关,个人主义和放纵指数的增加与食品出口呈正相关。另一方面,权力距离、男子气概指数与食品进口呈正相关,而个人主义、不确定性规避、放纵指数与食品进口呈负相关。考虑到各指标的影响程度,我们发现高不确定性规避、长期导向和男性化指数抑制了食品贸易,而高权力距离指数倾向于增加食品进口。最后,个人主义和放纵指数对食品出口的影响大于进口。
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引用次数: 0
期刊
Korean Agricultural Economics Association
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