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Development of the European Union’s environmental policy and its measures for climate protection – a review 欧盟环境政策的发展及其气候保护措施综述
Pub Date : 2022-02-08 DOI: 10.19041/apstract/2021/1-2/8
Zoltán Gabnai
The negative impacts of human activities on the environment and nature can be felt worldwide. Thus there is a growing focus on measurements that keep sustainability in mind. As one of the main pioneers of environmental protection and sustainability efforts, these aspects are more and more prevalent in the current environmental policy of the European Union (EU). In this review article, the development of the environmental policy of the EU is presented. After listing the main milestones, the role of the EU in the area of environmental protection, the frameworks built around the goals and the roles of the institutions are discussed. Then – with an international detour – the details of the Paris Agreement about climate change and the state of the 20/20/20 commitments are summarised. In the remaining parts of the article, the focus is on the climate protection goals of the EU for the next three decades, the expected future directions, and the agenda of the von der Leyen Commission concerning climate protection. An important step and tool for achieving the goals set until 2050 is to incorporate climate and environmental protection elements to the 2021-2027 budget of the EU. In order to achieve the expected effects, it is crucial to develop the right tools of the environmental policy, to form a widespread cooperation, to raise awareness, and incentivise and support the innovative solutions in the sustainability area.
人类活动对环境和自然的负面影响在全世界都能感受到。因此,人们越来越关注可持续性的测量方法。作为环境保护和可持续发展努力的主要先驱之一,这些方面在欧盟(EU)当前的环境政策中越来越普遍。在这篇综述文章中,介绍了欧盟环境政策的发展。在列出主要里程碑之后,讨论了欧盟在环境保护领域的作用,围绕目标建立的框架和机构的作用。然后——绕个国际弯路——总结关于气候变化的《巴黎协定》的细节和20/20/20承诺的现状。在文章的其余部分,重点是欧盟未来三十年的气候保护目标,预期的未来方向,以及冯德莱恩委员会关于气候保护的议程。实现2050年目标的一个重要步骤和工具是将气候和环境保护因素纳入欧盟2021-2027年预算。为了达到预期的效果,关键是要制定正确的环境政策工具,形成广泛的合作,提高认识,激励和支持可持续发展领域的创新解决方案。
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引用次数: 1
economic situation of Hungarian crop production enterprises, especially in Hajdú-Bihar county 匈牙利农作物生产企业的经济状况,特别是Hajdú-Bihar县
Pub Date : 2022-02-08 DOI: 10.19041/apstract/2021/1-2/11
Adél Dorottya Erdős, L. Szőllősi
Increasing the competitiveness of Hungarian crop production plays a key role in moving forward at the international level. However, improving efficiency and profitability is essential in this regard. The natural resources in Hungary provide an excellent opportunity for crop production. About 8% of the arable land in Hungary (a total of 4.3 million hectares) belongs to farmers in Hajdú-Bihar County. This research is based on secondary data that can be found in the HCSO and EMIS databases. HCSO data was used for the comparison of national and county data characterising crop production, while the EMIS database was used to process the financial data of enterprises dealing with field crop production. The Hungarian sample size is 853, of which 69 enterprises are from Hajdú-Bihar County. The aim of this study is to assess the profitability, assets and financial situation of arable crop production enterprises operating in Hajdú-Bihar County as a function of national average data. Based on the examined profitability indicators (operating ROS and ROA), it was established that the enterprises in Hajdú-Bihar County are profitable, even in a national context. In terms of operating ROS, the farms in the examined county were able to achieve a 3.6 percentage point higher value due to their more efficient cost management, despite having a similar level of technology compared to businesses spanning across the entire country. The proportion of farms with the lowest leverage ratio (<20%) is 16 percentage points higher at the county level than at the national level. In addition, almost 70% of the enterprises operating in Hajdú-Bihar County have excellent liquidity. This rate is 50% at the national level.
提高匈牙利作物生产的竞争力对在国际一级向前发展起着关键作用。然而,在这方面,提高效率和盈利能力是必不可少的。匈牙利的自然资源为农作物生产提供了绝佳的机会。匈牙利约8%的耕地(共430万公顷)属于Hajdú-Bihar县的农民。本研究以HCSO和EMIS数据库中的二手数据为基础。HCSO数据用于比较全国和县域作物生产特征数据,EMIS数据库用于处理大田作物生产企业的财务数据。匈牙利样本量为853家,其中69家企业来自Hajdú-Bihar县。本研究的目的是评估Hajdú-Bihar县耕地作物生产企业的盈利能力、资产和财务状况作为全国平均数据的函数。根据审查的盈利能力指标(经营ROS和ROA),确定Hajdú-Bihar县的企业是盈利的,即使在全国范围内也是如此。在经营ROS方面,尽管与全国各地的企业相比,技术水平相当,但受调查县的农场由于更有效的成本管理,能够实现3.6个百分点的高价值。最低杠杆率(<20%)的农场比例,县级比全国高16个百分点。此外,Hajdú-Bihar县近70%的企业具有良好的流动性。这个比率在全国范围内是50%。
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引用次数: 0
Profit efficiency among catfish marketers in Lagos state, Nigeria: a Stochastic Profit Frontier Analysis (SPFA) approach 尼日利亚拉各斯州鲶鱼市场的利润效率:随机利润前沿分析(SPFA)方法
Pub Date : 2022-02-08 DOI: 10.19041/apstract/2021/1-2/3
Aboaba Settings Kazeem
The study analyzed the determinants of profit efficiency among catfish marketers in Lagos state, Nigeria. Multistage sampling procedure was used to select 120 catfish marketers, data were collected with the aid of a structured questionnaire. The data collected were analyzed with the use of descriptive statistics, enterprise budgetary technique, Shephered-Futrell method and stochastic profit frontier analysis (SPFA) model. The result of the gross ratio and net return on investment reveals that catfish marketing was a profitable and bankable enterprise. About 76.72% of sales revenue was taken up by the costs. The SPFA reveals that cost of catfish purchased and depreciation cost had positive (p<0.01) effects on profit while transportation cost (p<0.01) and labour cost (p<0.05) had negative effects. Furthermore, marital status and credit use (p<0.01) had negative effects on profit inefficiency, the mean profit efficiency of the catfish marketers was 74%. The study concluded that catfish marketers were inefficient, however, to improve the efficiency of the marketers and create more job opportunities; the study recommends that credit facilities that will enable the marketers increase their scale of operation, acquire better marketing resources and employ capable hands in catfish marketing should be made available and accessible. Policies that will help to provide good road networks and reduce the pump price of premium motor spirit (PMS) should be given adequate consideration.      
该研究分析了尼日利亚拉各斯州鲶鱼营销商利润效率的决定因素。采用多阶段抽样方法,选取120名鲶鱼营销员,采用结构化问卷收集数据。运用描述性统计、企业预算技术、shepherd - futrell方法和随机利润前沿分析(SPFA)模型对所收集的数据进行分析。毛利率和净投资回报率的结果表明,鲶鱼营销是一个盈利和银行的企业。约76.72%的销售收入被成本占用。SPFA结果显示,采购成本和折旧成本对利润有正影响(p<0.01),运输成本(p<0.01)和人工成本(p<0.05)对利润有负影响。此外,婚姻状况和信贷使用对利润效率低下有负向影响(p<0.01),鲶鱼营销商的平均利润效率为74%。研究认为,鲶鱼营销人员效率低下,但要提高营销人员的效率,创造更多的就业机会;该研究建议,应提供信贷便利,使营销商能够扩大经营规模,获得更好的营销资源,并在鲶鱼营销中雇用有能力的人手。应充分考虑有助于提供良好道路网络和降低优质汽油(PMS)零售价的政策。
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引用次数: 0
Estimation of Armington elasticities: case of vegetables in Mongolia 阿明顿弹性的估计:以蒙古蔬菜为例
Pub Date : 2022-02-08 DOI: 10.19041/apstract/2021/1-2/5
Amar Uuld, R. Magda
Mongolian people often consume meat more than vegetable in diet due to traditional nomadic culture. Nowadays, the Mongolian people’s diet has been changing who consume more vegetables with associated urbanization (half of the population live in urban areas, mostly in the capital city). Even though vegetable consumption has been increased recently, the vegetable market is still a high reliance on imports and threatening national food security. Since 2016, the Mongolian government has especially paid attention to increasing vegetable's domestic production and substitution to import vegetables (Ministry of food and Agriculture, 2017). Therefore, this paper provided to substitution elasticity (the Armington elasticity) between import vegetables and domestic vegetables in Mongolia. Additionally, we estimated the home bias value of vegetables. The so-called Armington elasticities are widely used for computable general equilibrium (CGE) analysis, which determines a degree of substitution between import goods and domestically produced goods. Several of the authors studied Armington elasticities at the product level. We choose six vegetables (such as potato, garlic and onion, tomato, carrot and turnips, cabbage, and cucumber) related to lack of information. The empirical result shows that the Armington elasticities in the long-run higher than the short-run with exception of potato which means that products are similar in the long-run. However, our estimated Armington elasticities are quite lower than the previous studies result which means that Mongolian people indicated more prefer home growing vegetables than import vegetables. Moreover, we found that the home bias value is high in the short-run even long -run, this appears to be a higher relative weight on home vegetables. JEL code: F13, Q17, Q18
受传统游牧文化的影响,蒙古人的饮食中肉类的摄入量往往高于蔬菜。如今,蒙古人的饮食已经发生了变化,随着城市化的发展,蒙古人消费更多的蔬菜(一半的人口生活在城市地区,主要在首都)。尽管最近蔬菜消费量有所增加,但蔬菜市场仍然高度依赖进口,威胁着国家粮食安全。2016年以来,蒙古政府特别重视增加蔬菜的国内生产和替代进口蔬菜(Ministry of food and Agriculture, 2017)。因此,本文给出了蒙古进口蔬菜与国产蔬菜之间的替代弹性(阿明顿弹性)。此外,我们估计了蔬菜的家偏值。所谓的阿明顿弹性被广泛用于可计算一般均衡(CGE)分析,它决定了进口商品和国内生产商品之间的替代程度。几位作者在产品层面研究了阿明顿弹性。我们选择了六种蔬菜(如土豆、大蒜和洋葱、西红柿、胡萝卜和萝卜、卷心菜和黄瓜)相关的信息缺乏。实证结果表明,除马铃薯外,长期的阿明顿弹性高于短期,这意味着产品在长期内是相似的。然而,我们估计的阿明顿弹性比以往的研究结果要低得多,这意味着蒙古人更喜欢国产蔬菜而不是进口蔬菜。此外,我们发现,家庭偏差值在短期甚至长期都很高,这似乎是家庭蔬菜的相对权重较高。JEL代码:F13, Q17, Q18
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引用次数: 1
Factors associated with sustainability of agripreneurship interest among graduate youth in Southwestern Nigeria 与尼日利亚西南部毕业生青年农业创业兴趣可持续性相关的因素
Pub Date : 2022-02-08 DOI: 10.19041/apstract/2021/1-2/4
D. Alabi, D. L. Aribifo, Michael Famakinwa
The paper examined factors associated with sustainability of agripreneurship interest of graduate youth in Southwestern Nigeria. It specifically described the socio-economic characteristics of the respondents; identified their agripreneurship activities of interest and identified factors associated with their interest. A multi-stage sampling procedure was used to select 185 respondents from the selected the Local Government Areas in Southwestern States, quantitative and qualitative data were collected using semi structured questionnaire and Focus Group Discussion (FGD) respectively. Data were analyzed using descriptive statistical tool such as frequency counts, percentages, means and standard deviation while factor analysis was used to isolate crucial factors associated with sustainability of agripreneurship interest of serving graduate youth in the study areas. Results showed that respondents had a mean age of 26.18 ± 2.74 years and majority (75.7%) were not graduates of agriculture. The agricultural enterprises of interest to the respondents were poultry farming (67.6%)’ fish farming (56.5%) and snail farming (50.9%). Crucial factors found to influence sustainability of graduate youth’s interest in agripreneurship were motivational, parental influence, community asset and institutional factors among other. The study concluded that these identified factors were germane to the sustainability of graduate youth’s interest in agripreneurship in Southwestern Nigeria.
本文研究了与尼日利亚西南部毕业生青年农业创业兴趣可持续性相关的因素。它具体描述了受访者的社会经济特征;确定他们感兴趣的农业创业活动和确定与他们的兴趣有关的因素。采用多阶段抽样方法,从西南各州选定的地方政府区域中抽取185名受访者,分别采用半结构化问卷和焦点小组讨论(FGD)收集定量和定性数据。使用频率计数、百分比、均值和标准差等描述性统计工具对数据进行分析,同时使用因子分析来分离与研究地区服务毕业生青年农业创业兴趣可持续性相关的关键因素。结果调查对象平均年龄为26.18±2.74岁,非农科毕业生占75.7%;受访者感兴趣的农业企业为家禽养殖业(67.6%)、养鱼业(56.5%)和蜗牛养殖业(50.9%)。影响大学生创业兴趣可持续性的关键因素包括动机、父母影响、社区资产和制度因素等。研究得出的结论是,这些确定的因素与尼日利亚西南部毕业生青年对农业创业的兴趣的可持续性密切相关。
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引用次数: 0
Board diversity and firm value; mediating effect of CSR of listed oil firms in Nigeria 董事会多元化与公司价值;尼日利亚石油上市公司社会责任的中介效应
Pub Date : 2022-02-08 DOI: 10.19041/apstract/2021/1-2/7
Stephanie M. Chondough
In this empirical study, the mediating effect of corporate social responsibility (CSR) on the nexus between corporate value and board diversity is investigated. However, hypotheses developed for this study were tested with annualized panel dataset of eight (8) Nigerian listed oil and gas firms in the upstream sector spanning 2012 to 2019. Stakeholder theory was used to underpin the study. The study employed three indicators for board diversity (board professionalism, board nationality and board gender), Tobin’s Q and amount spent on CSR. The panel regression results show that looking at the indirect effect in Model One; board diversity has no significant effect on firm value. However, empirical findings indicated that CSR exerts a significant and positive relationship with corporate value. Considering Model Two, the results show that CSR plays a pertinent role in establishing the nexus between corporate value and board diversity, this finding is congruent with stakeholder theory. The study recommends that environmental sensitive firms should maintain an appropriate and balance diverse board as it plays a pertinent and significant role in establishing the nexus between stakeholder relationship and the firms, which can also serve as a mechanism to mitigate manager's opportunistic tendencies behind CSR investment. JEL code: L95, M14, M41
本实证研究考察了企业社会责任在企业价值与董事会多样性关系中的中介作用。然而,本研究提出的假设是用2012年至2019年期间尼日利亚8家上游上市石油和天然气公司的年度面板数据集进行测试的。利益相关者理论是研究的基础。本研究采用了三个董事会多样性指标(董事会专业性、董事会国籍和董事会性别)、托宾Q和企业社会责任支出。面板回归结果表明,考虑模型一的间接效应;董事会多元化对公司价值的影响不显著。然而,实证结果表明,企业社会责任与企业价值之间存在显著的正相关关系。考虑到模型二,结果表明企业社会责任在建立公司价值与董事会多样性之间的联系方面发挥了相关作用,这一发现与利益相关者理论是一致的。研究建议,环境敏感型企业应保持适当和平衡的多元化董事会,因为它在建立利益相关者关系与企业之间的联系方面起着相关和重要的作用,也可以作为一种机制来缓解管理者在企业社会责任投资背后的机会主义倾向。JEL代码:L95, M14, M41
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引用次数: 0
Optimal crop plan of cooperative farmers in Osun state, Nigeria: a linear programming approach 尼日利亚Osun州合作农民最优作物计划:线性规划方法
Pub Date : 2022-02-08 DOI: 10.19041/apstract/2021/1-2/2
N. Sofoluwe, A. Tijani
Optimal level of production requires better use of existing resources at the lowest possible cost. Despite the inherent advantage of cooperatives to the agricultural sector, the question of how farmers under cooperative umbrella use farm resource for optimal outcome remains unanswered. This study investigates optimal crop mix for cooperative farmers in rural communities in Southwest Nigeria. Primary data were collected for the study through structured questionnaire. The data were fitted to Linear Programming Model. Three different cropping patterns are identified among the cooperative farmers. Based on the results from linear programming model, only maize, cassava and yam are admitted in the final plan and this combination is to be produced at 2.23 hectares. The gross margin value associated with the plan is ₦156, 235.781 (1$ = N365). Input resources such as land, labour, fertilizer, and chemicals are not fully utilized. The slack values for these inputs are 0.31, 651.20, 1929.6 and 140.76 respectively. The sensitivity analysis shows that seed/seedling is the only binding resource in the final plan with a shadow price which suggests that proper allocation of seed and seedlings would improve returns to cooperative farmers. There is need for appropriate farm management strategies to ensure optimal return for farmers. More education and training is suggested to boost cooperative farmers understanding of optimum strategy that is needed to improve production and earnings. JEL code: Q10, Q13
最佳生产水平要求以尽可能低的成本更好地利用现有资源。尽管合作社对农业部门具有固有的优势,但合作社保护伞下的农民如何利用农场资源以获得最佳结果的问题仍然没有答案。本研究调查了尼日利亚西南部农村社区合作农民的最佳作物组合。通过结构化问卷收集研究的主要资料。数据采用线性规划模型拟合。合作社农民的种植模式有三种。根据线性规划模型的结果,最终计划只允许玉米,木薯和山药,该组合的生产面积为2.23公顷。与该计划相关的毛利率值为奈拉156,235.781(1美元= N365)。土地、劳动力、化肥、化学品等投入资源没有得到充分利用。这些输入的松弛值分别为0.31、651.20、1929.6和140.76。敏感性分析表明,种子/幼苗是最终计划中唯一具有影子价格的约束性资源,这表明合理配置种子和幼苗可以提高合作农民的收益。有必要采取适当的农场管理策略,以确保农民获得最佳回报。建议提供更多的教育和培训,以促进合作社农民了解提高生产和收入所需的最佳战略。JEL代码:Q10, Q13
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引用次数: 0
Carbon dioxide emission trends and environmental problems in Central Europe 中欧二氧化碳排放趋势与环境问题
Pub Date : 2022-02-08 DOI: 10.19041/apstract/2021/1-2/6
M. Rabbi
In this research, the effect of CO2 emission was measured in two different land-use types (Crop and Grassland) in Central European and V4 countries. The primary aim of this study is to identify the significant output of CO2 emissions from cropland and grassland. Secondary data collected from FAO (Food and Agriculture Organization of the United Nations) between 2010 and 2017. Mann-Whitney U test and odds ratio used to study the differences between the two country groups, and Principal Component Analysis was applied to create a performance map regarding the emission. A General Additive Panel model has analyzed the influence of area sizes and the regional differences on emissions. Results showed that the effect of grassland size is the primary factor in CO2 emission. A significant difference can only be found between CEU and V4 countries regarding grassland size effect on CO2 emission under grassland, which was rather small in the case of the V4 group but explained a larger part of the variance the of CEU countries. The odds of having higher CO2 from cropland to grassland was 2.43 times in the case of V4 compared to CEU countries.  
在本研究中,测量了中欧和V4国家两种不同土地利用类型(作物和草地)的CO2排放效应。本研究的主要目的是确定农田和草地的二氧化碳排放量。2010年至2017年期间从粮农组织(联合国粮食及农业组织)收集的二级数据。使用Mann-Whitney U检验和优势比来研究两个国家组之间的差异,并应用主成分分析来创建有关排放的绩效图。利用通用加性面板模型分析了面积大小和区域差异对排放的影响。结果表明:草地面积是影响CO2排放的主要因素;草地规模对草地下CO2排放的影响仅在CEU和V4国家之间存在显著差异,在V4组中差异较小,但在CEU国家之间差异较大。与中东欧国家相比,V4国家从农田到草地的二氧化碳含量较高的几率是后者的2.43倍。
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引用次数: 0
Development of leisure and sports consumption and sports motivation among children with disabilities 残疾儿童休闲体育消费与运动动机的发展
Pub Date : 2022-02-08 DOI: 10.19041/apstract/2021/1-2/9
Nóra Laoues-Czimbalmos, Zoltán Szerdahelyi, A. Müller
The number of studies on the leisure and sporting habits of people with disabilities as well as the background of sports motivation is far from the focus of research on intact research. Thus, the assessment of physical habits and sports motivation factors determining the quality of life of persons with disabilities can be considered as a less researched deficit area in Hungary and internationally. In our research, we examine the recreational and sporting habits of the 8-18 year-olds, as well as the motivational background, and the results of this research are presented in this paper. The importance of this issue is confirmed by the fact that, according to a UN survey, 650 million people have some kind of disability, 50 million of them in Europe and nearly half a million in Hungary, 5% of the population. The questionnaire (N = 639) was filled by children with disabilities living in the North Great Plain region with the help of a teacher. We used both closed and open questions in the questionnaire, and we helped and orient children with response categories for some questions.  Data were processed using SPSS software, averaged, standard deviation, median, mode, and Chi2 probe was used to examine relationships in addition to basic statistics. Our results showed that it is a problem for young people with disabilities that they prefer passive leisure activities, which is similar to the results of studies on intact research. Boys and girls have different sports, boys are more active than girls.
关于残疾人的休闲和运动习惯以及运动动机背景的研究数量远远不是完整研究的研究重点。因此,对决定残疾人生活质量的身体习惯和运动动机因素的评估可被视为匈牙利和国际上研究较少的缺陷领域。在我们的研究中,我们考察了8-18岁青少年的娱乐和运动习惯,以及动机背景,并将研究结果发表在本文中。根据联合国的一项调查,这个问题的重要性得到了这样一个事实的证实:6.5亿人有某种残疾,其中5000万人在欧洲,近50万人在匈牙利,占人口的5%。问卷(N = 639)由生活在北大平原地区的残疾儿童在一位老师的帮助下填写。我们在问卷中使用了封闭式和开放式问题,我们帮助和引导孩子对一些问题的回答类别。数据采用SPSS软件处理,除基本统计外,采用平均、标准差、中位数、众数和Chi2探针检验关系。我们的研究结果表明,青少年的残疾倾向于被动的休闲活动是一个问题,这与完整研究的结果相似。男孩和女孩有不同的运动,男孩比女孩更活跃。
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引用次数: 1
Pork production and consumption issues from the perspective of the religion and the World's growing population 从宗教和世界人口增长的角度看猪肉生产和消费问题
Pub Date : 2021-10-08 DOI: 10.19041/APSTRACT/20201-2/16
V. Viktoria, Szűcs István
In this article we would like to present the production and consumption issues of pork meat in the world. We intend to examine the production and consumption of pork meat from the point of view of the population. The growing population of the world requires an increasing amount of food, especially animal source of protein, ie meat. We want to examine how the world can supply the growing population with food, including (pork) meat. The growing population generates ever-increasing consumption from year to year, and may not be able to satisfy it, adequately supplying the population with food, especially (pork) meat. Livestock farming, especially extensive animal husbandry, will be less able to produce sufficient quantities of meat for the growing needs. During the analysis of food (meat) data we would like to present the difference between each continent on both the production and the consumption side. Examining the pork consumption, it should be mentioned the differences in the cultural habits, because the pork meat is the most affected in religious restrictions, regulations. The religious affiliation/identity is basically determined by the food and consumer habits, too. Due to the differences in dietary habits and religious culture, we think that the consumption of pork can be highly variable in the world and from country to country as well. In general, we would like to answer questions about how the world (pork) meat production is going, is the meat consumed in the countries where it is produced (export – import issues), what are the factors that influence (pork) meat consumption (culture and religion impact on pork consumption, animal health issues), and is there enough (pork) meat for the world's growing population. JEL code: P46, Q18, Q56 ARTICLE IN PRESS!
在这篇文章中,我们想介绍世界上猪肉的生产和消费问题。我们打算从人口的角度来研究猪肉的生产和消费。世界上不断增长的人口需要越来越多的食物,特别是动物来源的蛋白质,即肉。我们想研究世界如何为不断增长的人口提供食物,包括猪肉。不断增长的人口每年都会产生越来越多的消费,而且可能无法满足它,为人口提供足够的食物,特别是(猪肉)肉。畜牧业,特别是粗放型畜牧业,将无法生产足够数量的肉类来满足日益增长的需求。在分析食品(肉类)数据时,我们希望展示各大洲在生产和消费方面的差异。考察猪肉消费,应该提到文化习惯的差异,因为猪肉是受宗教限制、规定影响最大的。宗教信仰基本上也是由食物和消费习惯决定的。由于饮食习惯和宗教文化的差异,我们认为猪肉的消费量在世界范围内以及各国之间都有很大的差异。总的来说,我们想回答的问题是:世界(猪肉)肉类生产是如何进行的,肉类在生产国消费(出口-进口问题),影响(猪肉)肉类消费的因素是什么(文化和宗教对猪肉消费的影响,动物健康问题),以及世界上不断增长的人口是否有足够的(猪肉)肉类。JEL代码:P46, Q18, Q56
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引用次数: 2
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Apstract Applied Studies in Agribusiness and Commerce
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