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Commodity Storage, Price Stabilization, and Food Security 商品储存、价格稳定和粮食安全
Q3 Business, Management and Accounting Pub Date : 2020-01-01 DOI: 10.1515/jafio-2019-0053
A. Schmitz
The debate over the role of commodity storage in reducing price instability to the net benefit to society continues. Most of the early literature deals with stocks and price instability under price certainty. Little attention is given to the effects of stockholding on food security. Some of the earlier works based on welfare economics (Just, Hueth, and Schmitz 2004) include Waugh (1944), Oi (1961), Massell (1970), and Hueth and Schmitz (1972). Waugh concludes that consumers prefer price instability. As a result, there are costs from commodity storage used to generate price stability. Likewise, Oi concludes that producers prefer price instability; hence, storage is costly for producers. Massell demonstrates that in a market setting that included producers and consumers, society prefers price stability over instability. However, Schmitz (forthcoming) argues that this need not be the case given that both consumers and producers prefer price instability. His arguments are based on an explanation of why stocks are not achievable (Schmitz 2018a) and that producers prefer price instability regardless of the source of the instability (Schmitz 2018b). Later literature expanded the analyses to multi-products. For example, Turnovsky, Shalit, and Schmitz (1980) and Schmitz, Shalit, and Turnovsky (1981) using utility maximization models demonstrated that in the case of multi-products, producers, for example, prefer stability for a subset of the commodities produced but not for the entire set. Tisdell (1972) analyzed stock policy under uncertainty and concluded that the welfare gains from stabilization are highly dependent on the degree of market uncertainty. Feder, Just, and Schmitz (1980) presented a theory of the firm model where, under uncertainty, producers have several risk management tools, including storage. (References to additional papers can be found in Wright and Williams (1984)).
关于商品储存在减少价格不稳定以实现社会净利益方面的作用的辩论仍在继续。大多数早期文献都涉及股票和价格确定性下的价格不稳定性。很少注意到库存对粮食安全的影响。一些早期基于福利经济学的著作(Just,Hueth,and Schmitz 2004)包括Waugh(1944),Oi(1961),Massell(1970),以及Hueth和Schmitz(1972)。沃得出结论,消费者更喜欢价格不稳定。因此,商品储存产生了用于产生价格稳定性的成本。同样,Oi得出结论,生产者更喜欢价格不稳定;因此,存储对生产商来说成本高昂。Massell证明,在包括生产者和消费者的市场环境中,社会更喜欢价格稳定而不是不稳定。然而,Schmitz(即将发表)认为,鉴于消费者和生产者都喜欢价格不稳定,情况不必如此。他的论点是基于对为什么股票是不可实现的解释(Schmitz 2018a),以及生产者更喜欢价格不稳定,而不管不稳定的来源是什么(Schmitz-2018b)。后来的文献将分析扩展到多产品。例如,使用效用最大化模型的Turnovsky、Shalit和Schmitz(1980)以及Schmitz、Shalit和Turnovsky(1981)证明,在多产品的情况下,例如,生产商更喜欢所生产商品的一个子集的稳定性,而不是整个商品集的稳定性。Tisdell(1972)分析了不确定性下的股票政策,得出稳定带来的福利收益高度依赖于市场的不确定性程度。Feder、Just和Schmitz(1980)提出了一种企业模型理论,在不确定性下,生产商有几种风险管理工具,包括存储。(其他论文的参考文献见Wright和Williams(1984))。
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引用次数: 3
Effects of Stockholding Policy on Maize Prices: Evidence from Zambia 库存政策对玉米价格的影响:来自赞比亚的证据
Q3 Business, Management and Accounting Pub Date : 2019-12-07 DOI: 10.1515/jafio-2019-0057
Yujun Zhou, K. Baylis
Abstract Many countries in the developing world use public stockholding programs to stabilize prices for both farmers and consumers. Governments directly purchase and store staple grains, and then sell them to processors or consumers, often at heavily subsidized prices. Despite the substantial costs of these stockholding programs, little is known about their effectiveness in mitigating retail price swings. This paper estimates the effects of purchase and sales activities of the Zambian Food Reserve Agency (FRA) on monthly maize market prices across more than thirty markets in Zambia from 2003 to 2008. To deal with the endogeneity in purchases and sales, we use predicted FRA purchase and sales targets as instrumental variables. Controlling for other policies, we find evidence that FRA activities stabilize retail prices in major district markets within the cropping year. Results show that FRA purchases raise local prices for surplus maize producers about 5 % on average at the time of harvest, and that FRA sales help lower the prices to consumers during the lean season up to 7 %. However, we find limited evidence that the FRA is able to reduce price volatility between years.
摘要发展中国家的许多国家利用公共持股计划来稳定农民和消费者的价格。政府直接购买和储存主粮,然后以高额补贴价格出售给加工商或消费者。尽管这些持股计划成本高昂,但人们对其在缓解零售价格波动方面的有效性知之甚少。本文估计了2003年至2008年赞比亚粮食储备局(FRA)的采购和销售活动对赞比亚30多个市场玉米月度市场价格的影响。为了处理采购和销售中的内生性,我们使用预测的FRA采购和销售目标作为工具变量。在控制其他政策的情况下,我们发现有证据表明,FRA活动在种植年内稳定了主要地区市场的零售价格。结果表明,联邦铁路管理局的采购使剩余玉米生产者在收获时的当地价格平均上涨了约5%,联邦铁路局的销售有助于在旱季将消费者的价格降低7%。然而,我们发现有限的证据表明,联邦铁路管理局能够减少多年之间的价格波动。
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引用次数: 3
Regular Price Stickiness in German Food Retailing 德国食品零售业的价格粘性
Q3 Business, Management and Accounting Pub Date : 2019-11-20 DOI: 10.1515/jafio-2019-0027
P. Holzer, Thomas Bittmann
Abstract The present study investigates the underlying factors of price stickiness in German food retailing using fluid milk as a case study. We distinguish the duration between two actual price changes and two regular price changes as measures for price stickiness. Especially in the case of private labels, the choice of proxy for price rigidity has important implications. If we consider (regular) price changes, private label products are more (less) rigid than national brands. Price rigidity increases in the product’s average price. Prices of low priced private labels are rather flexible. Price adjustment of high priced private labels is similarly sluggish compared to national brands. We rationalize this finding with variable mark-ups under imperfect competition. In line with previous research, we find that price stickiness also depends on product attributes, retail formats, menu costs, psychological price points, and time-varying market conditions.
摘要本研究以液态奶为个案,探讨德国食品零售业中价格粘性的潜在因素。我们区分两次实际价格变化和两次常规价格变化之间的持续时间作为价格粘性的度量。特别是在自有品牌的情况下,选择价格刚性的代理具有重要意义。如果我们考虑(定期)价格变化,自有品牌产品比国家品牌更(更少)僵化。价格刚性增加了产品的平均价格。低价自有品牌的价格相当灵活。与全国性品牌相比,高价自有品牌的价格调整同样迟缓。我们用不完全竞争下的可变加价来合理化这一发现。与之前的研究一致,我们发现价格粘性还取决于产品属性、零售业态、菜单成本、心理价格点和时变的市场条件。
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引用次数: 2
Storage Policies: Stockpiling Versus Immediate Release 存储策略:储存与立即释放
Q3 Business, Management and Accounting Pub Date : 2019-11-12 DOI: 10.1515/jafio-2019-0055
J. Wesseler
Abstract Storage policies are used in many countries to smooth price volatility and thereby support food security. When there is a global decrease in food supply caused by a number of extreme weather effects, food reserves are expected to reduce the potential negative implications for households with low purchasing power. In this paper, the properties of such a stockpiling policy are assessed and compared to a policy with storage but without stockpiling. The results show that a stockholding policy is an expensive strategy that generates economic benefits only in extreme cases.
摘要许多国家采用储存政策来缓和价格波动,从而支持粮食安全。当一些极端天气影响导致全球粮食供应减少时,预计粮食储备将减少对低购买力家庭的潜在负面影响。本文评估了这种储存政策的性质,并将其与有储存但没有储存的政策进行了比较。结果表明,持股政策是一种代价高昂的策略,只有在极端情况下才会产生经济效益。
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引用次数: 16
Farmers’ Grain Storage and Losses in Ethiopia 埃塞俄比亚农民的粮食储存和损失
Q3 Business, Management and Accounting Pub Date : 2019-11-09 DOI: 10.1515/JAFIO-2019-0059
F. Bachewe, B. Minten, Alemayehu Seyoum Taffesse, K. Pauw, Alethia Cameron, Tirsit Genye Endaylalu
Abstract While storage losses at the farm are often assumed to be an important contributor to presumed large postharvest losses in developing countries, reliable and representative data on these losses are often lacking. We study farmers’ storage decisions and self-reported storage losses for grains based on two large-scale household surveys conducted in major agricultural areas in Ethiopia. We show that a relatively large share of grain production is stored by farm households for own consumption and that storage technologies are rudimentary. Farmers’ self-reported storage losses amount to an average of 4 % of all grains stored and 2 % of total harvest. These storage losses differ significantly by socioeconomic variables and wealth, as well as by crop and humidity. We further see strong spatial heterogeneity in storage losses being significantly higher in southwest Ethiopia. Efforts to scale up the adoption of improved storage technologies to reduce storage losses at the farm level should consider these characteristics.
在发展中国家,农场的储存损失通常被认为是造成巨大采后损失的一个重要因素,但关于这些损失的可靠和有代表性的数据往往缺乏。我们根据在埃塞俄比亚主要农业区进行的两次大规模家庭调查,研究了农民的粮食储存决策和自我报告的粮食储存损失。我们的研究表明,相对较大的粮食产量是由农户储存供自己消费的,而且储存技术还很落后。农民自我报告的储存损失平均占所有储存谷物的4%,占总收成的2%。这些储存损失因社会经济变量和财富,以及作物和湿度而有很大差异。我们进一步看到,埃塞俄比亚西南部储存损失的空间异质性明显更高。在农场一级扩大采用改良储存技术以减少储存损失的努力应考虑到这些特点。
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引用次数: 14
Commodity Storage, Post-Harvest Losses, and Food Security: Panel Data Evidence from Ethiopia 商品储存、收获后损失和粮食安全:来自埃塞俄比亚的小组数据证据
Q3 Business, Management and Accounting Pub Date : 2019-11-09 DOI: 10.1515/jafio-2019-0058
Z. Gebreegziabher, G. V. van Kooten
Abstract In Ethiopia, 95 % of total agricultural output comes from some 11 million smallholder farmers. A relatively significant proportion of the food grown in the country is stored at the household level by smallholder farm households, mainly for own consumption. Storage losses, generally perceived to be high, have significant implications for household food security. This study provides a microeconomic perspective of commodity storage, post-harvest losses (PHL), and food security in Ethiopia. It relies on a large-scale household panel dataset, the Ethiopia Socioeconomic Survey (ESS), which comprises 4,000 households in rural areas and small towns that are representative of the most populous regions of Ethiopia. The data were collected as part of the World Bank’s LSMS-ISA project; it involved three “waves” or collection periods: 2011/12, 2013/14, and 2015/16. Data from only the second and third waves were used to estimate a random-effects probit model. Findings show that the magnitude of PHL is substantial: damage is due to rodents and rotting related to traditional storage facilities, poor ventilation, humidity/temperature, and undesirable post-harvest handling. Findings also show that PHL decreases with better market access and improved storage practices. Mitigation measures that improve and promote modern grain storage facilities appear to provide a double dividend – reducing PHL while addressing food insecurity.
在埃塞俄比亚,95%的农业总产量来自1100万小农。该国种植的粮食中有相当大一部分是由小农家庭在家庭一级储存的,主要供自己消费。储藏损失普遍被认为很高,对家庭粮食安全有重大影响。本研究提供了埃塞俄比亚商品储存、收获后损失和粮食安全的微观经济学视角。它依赖于一个大规模的家庭面板数据集,即埃塞俄比亚社会经济调查(ESS),该数据集包括代表埃塞俄比亚人口最多地区的农村地区和小城镇的4000个家庭。这些数据是作为世界银行lsm - isa项目的一部分收集的;它涉及三个“浪潮”或收集期:2011/12、2013/14和2015/16。仅使用第二和第三波的数据来估计随机效应概率模型。结果表明,PHL的严重程度是巨大的:破坏是由于啮齿动物和与传统储存设施有关的腐烂,通风不良,湿度/温度和采收后处理不当。研究结果还表明,PHL随着市场准入的改善和存储实践的改进而降低。改善和促进现代粮食储存设施的缓解措施似乎提供了双重红利——减少PHL的同时解决粮食不安全问题。
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引用次数: 3
Is Commodity Storage an Option for Enhancing Food Security in Developing Countries? 商品储存是加强发展中国家粮食安全的一种选择吗?
Q3 Business, Management and Accounting Pub Date : 2019-11-08 DOI: 10.1515/JAFIO-2019-0054
G. C. van Kooten, A. Schmitz, P. Kennedy
Abstract We revisit the underlying economics of commodity storage and its relation to food security by first clarifying the standard model used to analyze the economic efficiency and distributional effects of commodity storage programs. We find that producers prefer stabilization, although their incomes are more variable, while consumers are indifferent. However, numerical simulations indicate that physical stocks will build up inexorably over a sustained period or the government will need to raise prices continuously over a prolonged period. For the least developed countries facing fluctuating world prices, government should guarantee the price received by producers because, with price uncertainty, farmers could experience losses even under a ‘good’ weather outcome; this would guarantee the producer price, benefitting farmers, while allowing the consumer price to vary with the world price benefits consumers as they prefer price instability. In some cases, however, the government may wish to impose a price ceiling so that households living at or near subsistence can afford to buy grain – an argument based on the grounds of food security. Numerical simulations indicate that such a mixed-price policy increases the wellbeing of both consumers and producers. Physical storage is not a necessity.
摘要我们通过首先澄清用于分析商品储存计划的经济效率和分配效应的标准模型,重新审视了商品储存的基本经济学及其与粮食安全的关系。我们发现,生产者更喜欢稳定,尽管他们的收入变化更大,而消费者则漠不关心。然而,数值模拟表明,实物库存将在一段持续的时间内无情地增加,否则政府将需要在很长一段时间内持续提价。对于面临世界价格波动的最不发达国家,政府应保证生产商收到的价格,因为由于价格的不确定性,即使在“好”天气的情况下,农民也可能遭受损失;这将保证生产者价格,使农民受益,同时允许消费者价格随世界价格变化,这有利于消费者,因为他们更喜欢价格不稳定。然而,在某些情况下,政府可能希望设定价格上限,以便生活在或接近自给水平的家庭能够负担得起购买粮食的费用——这是基于粮食安全的理由。数值模拟表明,这种混合价格政策增加了消费者和生产者的福祉。物理存储不是必须的。
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引用次数: 4
The Role of Storage and Trade in Food Security 储存和贸易在粮食安全中的作用
Q3 Business, Management and Accounting Pub Date : 2019-11-05 DOI: 10.1515/jafio-2019-0056
P. Kennedy, A. Schmitz, G. C. van Kooten
Abstract This paper examines the role of storage and trade on food security with respect to milled rice in India for the period 1966–2013. Data on food balances, prices, and population obtained from FAOSTAT allow for the observation of the status quo with storage and trade. Then, using a spatial equilibrium framework, the outcomes without storage or trade are simulated. Our results are consistent with the literature with respect to welfare effects. Storage results in net welfare gains to society, although producers gain while consumers lose. Producers receive a welfare gain from net exports while consumers gain from net imports. From a food security perspective, the use of storage has provided benefits to consumers by increasing stability in the market, as seen through decreased standard deviation in both domestic rice prices and per capita availability. The results are mixed with respect to stability from trade.
本文考察了1966年至2013年期间印度精米的储存和贸易对粮食安全的影响。从粮农组织统计数据库获得的关于粮食平衡、价格和人口的数据可用于观察粮食储存和贸易的现状。然后,利用空间均衡框架,模拟了没有储存或贸易的结果。我们的结果与有关福利效应的文献一致。储存给社会带来了净福利收益,尽管生产者受益而消费者受损。生产者从净出口中获得福利收益,而消费者从净进口中获益。从粮食安全的角度来看,储存的使用增加了市场的稳定性,从而给消费者带来了好处,这可以从国内大米价格和人均可得量的标准偏差降低中看出。就贸易稳定而言,结果好坏参半。
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引用次数: 5
The Influence of Online Reviews on Restaurants: The Roles of Review Valence, Platform, and Credibility 网络评论对餐馆的影响:评论价值、平台和可信度的作用
Q3 Business, Management and Accounting Pub Date : 2019-10-02 DOI: 10.1515/jafio-2018-0020
Anne-Wil van Lohuizen, Andres A. Trujillo‐Barrera
Abstract Online reviews influence consumer decision making, retrieving valuable information about consumers to the companies. We investigate how review valence, platform type, and review credibility affect purchase intention (visit to restaurants). We use an experimental 2 × 4 between-subjects factorial design with two platforms (company websites and independent websites) and four types of review valences (neutral, negative, positive and balanced), with data of 256 respondents. Results show that purchase intentions are influenced by review valence. The effect is moderated by perceived review credibility. Review platform has no moderating effect on the influence of review valence. Results provide practical information for marketers in the service industry.
在线评论影响消费者的决策,为企业检索消费者有价值的信息。我们调查了评价效价、平台类型和评价可信度如何影响购买意愿(去餐馆)。我们采用实验性的2 × 4受试者间因子设计,采用两个平台(公司网站和独立网站)和四种评价价(中性、消极、积极和平衡),共有256名受访者的数据。结果表明,评价效价对购买意向有显著影响。这种效应被感知到的评论可信度所调节。评价平台对评价效价的影响没有调节作用。结果为服务行业的营销人员提供了实用的信息。
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引用次数: 1
The GMO Pipeline, Import Bans and Asynchronous Approvals – The Impact on Agricultural Trade GMO管道、进口禁令和异步批准——对农业贸易的影响
Q3 Business, Management and Accounting Pub Date : 2019-07-31 DOI: 10.1515/JAFIO-2019-0015
Marija Pavleska, W. Kerr
Abstract The divergence in approaches to regulation of genetically modified organisms (GMOs) among countries is a contentious policy issue that has externalities that inhibit trade in agricultural products. One result is that approvals of GMO events is internationally asynchronous. Countries whose approval processes are slower or more stringent often impose import bans or other non-tariff barriers on imports of GM products they have rejected or have yet to approve. These trade barriers have been the subject of considerable investigation. As more and more GMO events are approved in some countries, but not in others, the probability of unintended mingling of GM crops in shipments of non-GM crops increases. Shipments of non-GM crops with a low level presence of non approved GM crops are routinely rejected by importing countries. This growing disruption to trade has not received a great deal of attention. This paper uses information from the GMO research and commercialization pipeline to estimate the potential impact of increases in mingling on international trade flows using a CGE model – GTAP. The results suggest that the growing potential for mingling will have a considerable detrimental impact on trade flows and, hence, tolerance levels should be an important question for multilateral trade negotiations.
摘要各国对转基因生物监管方法的差异是一个有争议的政策问题,其外部性抑制了农产品贸易。一个结果是GMO事件的批准在国际上是异步的。批准程序较慢或更严格的国家通常对其拒绝或尚未批准的转基因产品的进口实施进口禁令或其他非关税壁垒。这些贸易壁垒一直是大量调查的主题。随着越来越多的转基因事件在一些国家获得批准,但在另一些国家却没有,转基因作物在非转基因作物运输中意外混合的可能性增加。进口国通常会拒绝进口未经批准的转基因作物含量较低的非转基因作物。这种日益严重的贸易中断并没有引起太多关注。本文使用来自GMO研究和商业化渠道的信息,使用CGE模型——GTAP来估计混合增加对国际贸易流的潜在影响。结果表明,日益增长的混合潜力将对贸易流动产生相当大的不利影响,因此,容忍度应该是多边贸易谈判的一个重要问题。
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引用次数: 1
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Journal of Agricultural and Food Industrial Organization
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