A dynamic interregional theory of migration and population growth

The authors attempt to bring the theory of regional amenity value determination together with a theoretical framework on migration to form a cohesive theoretical model. They build on previous efforts to do this by introducing factors such as the housing market and determination of the equilibrium level of real full income. The implied geographical focus is on the United States.     

Capital accumulation and the growth of aggregate agricultural production

This report empirically examines the role which capital accumulation plays in the growth of agricultural production potential. The report assumes that the degree to which available technology can be implemented in a nation's agricultural sector depends on accumulated investments that have been made in the sector. Results from estimating aggregate agricultural production functions show the primary importance of rural labor in accounting for agricultural gdp and crop production. Capital accumulation is the dominant explainer of livestock production. Estimation results support the conjecture that capital tends to save scarce land resources (substitute relationship) and use rural labor (complementarity relationship). Output supply elasticities derived from the estimated equations tend to be large. The large elasticities imply that price distortions have had large impacts on resource use and production.     

食品添加剂与食品安全概述

合理使用食品添加剂有助于食品行业的商品化,但是随着食品安全事故的逐渐增多,必须要对食品添加剂的使用有正确的认识.本文对食品添加剂的主要问题进行阐述,分析食品添加剂的作用、重要性、发展现状以及可能存在的问题,并最终提出正确使用食品添加剂的建议.     

The Food Stamp Program and Food Insufficiency

Food stamp participants have higher food insufficiency rates than eligible nonparticipants, even after controlling for other factors. Given the Food Stamp Program's prominent role in the alleviation of hunger, this is a counterintuitive result. We conjecture that these higher rates are due to adverse selection insofar as households more likely to be food insufficient are also more likely to receive food stamps. We establish a theoretical framework to address this adverse selection. Using a simultaneous equation model with two probits, we show that once one controls for this adverse selection, food stamp recipients have the same probability of food insufficiency as nonrecipients.     

Food Aid and Food Security: A Cautionary Note

A simple model is presented to examine the effects of instability in global food aid supplies on foreign exchange expenditures and food availability in recipient countries. When global food prices rise, food aid recipients are doubly affected through decreased availability of food aid, and through higher costs of additional commercial imports needed to make up the shortfall. Empirical estimates of key parameters of the model suggest that countries with a high dependence on food aid may place their food security at risk.
Suit un modèle simple qui permet d'analyser les conséquences de l'instabilité des approvi-sionnements destinés à l'aide alimentaire sur les dépenses en devises étrangères et l'offre d'aliments dans les pays bénéficiaires. Lorsque le prix mondial des aliments augmente, les bénéficiaires de l'aide alimentaire subissent le contrecoup à la fois d'une aide alimentaire réduite et du coût plus éléve des produits importés pour répondre à la pénurie. Une estimation empirique des principaux parametrés du modele suggére que les pays qui dépendent fortement de l'aide alimentaire compromettent leur sécurité alimentaire.     

后疫情时代粮食发展与粮食安全

后疫情时代,世界粮食发展与安全格局发生新变化。稳定发展粮食生产,继续解决好吃饭问题,是治国理政的头等大事。改革开放以来,特别是党的十八大以来,我国粮食发展与安全取得重大成就,堪称伟大奇迹。中国特色的“三农”理念、农村改革、制度政策、农业经营主体、农业科技创新,为国家粮食发展与安全奇迹的创造提供了有力支撑。面对当前全球粮食生产及供给面临的新形势新挑战,必须深入贯彻习近平总书记关于粮食安全的重要论述,认真学习贯彻十九届五中全会精神,进一步强化对粮食地位、功能及内涵的认识,从维护国家安全、应对国际地缘政治新挑战和新冠肺炎疫情影响、支撑国家经济社会稳定发展、加快形成双循环发展新格局和全面建设社会主义现代化国家的战略高度,坚持把“三农”工作摆在全党工作的重中之重地位,坚定不移地走中国特色粮食发展与安全之路。     

Food,farmers, and the future: Investigating prospects of increased food production within a national context

With international food price shocks in 2008 and 2011, food security became a political priority in many countries. In addition, some politicians have recently adopted a more nationalistic stance. Against that background, this paper critically investigates the prospects of increased food production within a national context. We use a small, high-income country, Norway, as an empirical case. In 2012, the government set a goal of increasing agricultural food production by 20% by 2030. We ask: 1) How has food production in Norway developed before and after the goal was set? 2) What plans do farmers have, and what do they regard as the main obstacles to increased production? We apply a mixed method combining public statistics, a survey, and interviews. We analyze four production systems: a) milk; b) grass-based meat; c) combined pig and grain; and d) grain. These systems represent around 80% of the domestically consumed food produced on farms in Norway. Since 2000, aggregate food production has had a slight downward trend with periodic fluctuations. Based on a political economy approach, we identify land and labor as the most limiting factors. Capital is less of a hindrance and offers a potential for increased production. Farmers have modest expectations of increased production, though. This outlook resonates with the strong integration of agriculture into the wider economy, at both micro and macro levels, making it challenging to implement new policies and change farm practices on a broad basis. Increases in some specific products, however, are realistic.     

强化食品抽样检验推动食品安全深度监管

做好食品抽样检验工作是确保食品质量和安全的关键,本研究对目前国内食品抽样检验管理现状进行了分析,针对食品安全抽样检验管理存在的问题提出要强化制度建设、强化技术团队建设、制定统一检测标准等方法,并提出进一步深化改革食品安全抽样检验管理办法,旨在保障公众食品安全,提高食品抽样监管力度.     

Food Stamps and Food Spending: An Engel Function Approach

Estimation of Food Stamp Program (FSP) effects has been complicated by self-selection and by a contradiction between observed spending patterns and the economic theory of consumer choice. We developed a modified version of the traditional theory, in which participant households may be partly extramarginal even if they have some cash spending on at-home food. Using Current Population Survey (CPS) data for 2001–2005, we estimated Engel functions for at-home and away-from-home food spending for FSP participants and nonparticipants. Compared to nonparticipants with the same level of total income, participants had higher at-home food spending and lower away-from-home food spending.     

论当前形势下食品抽检监测与食品安全

当前食品安全事关人们的身体健康,食品抽检监测质量与食品安全问题已经引发全社会的关注和重视.本文主要讨论了当前形势下抽检监测对于食品安全的重要意义.针对我国存在的食品安全主要问题展开分析,针对现存问题采取科学、有序的食品抽检监测措施,为保障人们的生命安全和健康做出积极贡献.     

Food Preferences and Ethnicity

Policies to curb food imports in food deficit Sahelian countries have been unsuccessful. Sahelian countries are ethnically diverse and each group has demonstrated strong preferences for cereals and other foods. Yet, research on the consequences of expressed food preferences on food production, consumption, and importation is limited. In this paper, the effects of ethnic identity and income class on food consumption choices were investigated. The results showed that all consumers, use the same criteria in evaluating a given set of foods irrespective of ethnic group, or income class. Ethnic groups and income classes choose a given food basket, which maximizes their welfare, if the same criteria are used in making their food choices.     

Food Aid, Food Prices, and Producer Disincentives in Ethiopia

Although the short-term aims of food aid are well conceived, strong concerns have been voiced regarding the long-term impacts of such aid on incentives for agricultural producers in recipient countries. This article examines the statistical link between food aid shipments and food prices in Ethiopia over the period 1996–2006. Monthly data from three markets and three commodities are used to estimate a system of seemingly unrelated regression models for food prices. Results indicate that previous year food aid shipments reduce prices in all producer and consumer markets. These effects, however, appear to be limited to the set of internationally traded commodities that are domestically marketed. A recursive regression procedure is used to identify the food aid threshold at which a negative aid effect emerges. Food aid shipments that constitute less than 10% of domestic production appear to be benign, but shipments above this level show signs of being disruptive to local markets. We use a simple policy simulation to argue that production-sensitive targeting, e.g., conditioning food aid on local food production, would help to circumvent disincentive effects.     

Consumer Valuation of Food Quality and Food Safety Attributes in Vietnam

Food systems in developing countries are currently undergoing a profound transformation toward high-value products. Appropriate policies are needed to guide this transformation, presupposing good understanding of consumer preferences. We analyze consumers' valuation of different vegetable attributes in metropolitan areas of Vietnam, using contingent valuation techniques and a mediation framework for two specific examples. Consumers are willing to pay an average price premium of 60% for Chinese mustard that is free of chemical residues and of 19% for different convenience attributes of potatoes. Income levels and media have positive impacts on the willingness to pay, partly mediated through consumer perceptions.     

食品安全检测技术对食品质量安全的影响

食物的品质安全是保证人们生命健康的关键因素,是人们赖以生存与发展的最主要的前提条件。而随着社会主义市场经济的日益发展,人们的生活水平也在逐步改善,对食物的安全品质问题也越来越关注。目前,在我国的食品安全监督管理检验中,不论是在技术上,还是在产品质量安全监督管理方面,都仍面临着许多不足和问题,并不断影响检验技术的深入发展与完善。因此,本文重点对食品安全监督管理检验技术进行了论述与研究,期望可以通过了解该技术进展状况,为我国食品领域发展提出合理的指导意见,实现我国食品安全监督管理检验技术水平的进一步提高,进而促进我国食品领域的健康发展。     

粮食安全背景下的生态安全与食品安全

新中国建国以来粮食安全、生态安全与食品安全的关系大致分为两个阶段:从新中国成立到改革开放前属于粮食供应短缺与生态环境压力增大时期;改革开放以来,化肥、农药、动植物激素等生产要素的大量引入,促使粮食供需达到紧张平衡,短期内粮食安全问题得到缓解,长期来看,农业面源污染加剧,土壤毒化、地下水超采、土地荒漠化与水土流失继续恶化,粮食供给不可持续,同时,粮食安全问题逐渐以食品安全的形式表现出来。面对粮食安全、生态安全与食品安全的三重压力,中国应适时调整农业发展战略,逐步摆脱石油农业,实现农业的可持续发展。