农业机械化发展及其服务外包的原因分析——源自冀豫鲁3省问卷调查数据的证明

[目的]在统计描述华北平原农民的机械采纳率和机械采纳方式的基础上,分析农民的机械化需求和农机手的机械服务供给行为及其内在逻辑,从理论和实证两个维度对华北平原地区农业机械技术的特殊实现形式——服务外包做出解释。[方法]运用描述性统计分析和成本收益核算等方法,利用冀豫鲁3省779个农户和45个农机手的实地调研数据分别对农业机械化发展的前提条件和实现方式做出解释。[结果]农业劳动力成本上升与农机购置成本下降,共同刺激了农民的机械技术需求,是华北平原农业机械化快速发展的前提条件;持有农业机械的农民基于理性选择而向其他农民提供农机作业服务,是推动华北平原农业机械化以服务形式实现的主要原因。[结论]相关部门应继续探索高效的农机补贴模式,刺激农民的机械技术需求;农业机械支持政策可适当向农机合作社倾斜,提高农机手的组织化程度和服务数量与质量。     

供给侧结构性改革推进四川省玉米产业转型发展策略

[目的]随着中国粮食产量的"十二连增",国内农业生产的主要矛盾也逐步由总量不足转向结构性矛盾,其中玉米产业面临的矛盾尤为突出,玉米产业结构调整是我国农业供给侧结构性改革推进中的首要任务。四川既是全国玉米生产的重要省份,也是玉米消费大省,如何推进玉米产业供给侧结构性改革、实现产业转型发展还有待于思考。[方法]文章从供需平衡、供给结构、供给效益和供给效率4个角度分析了四川玉米产业供给侧的特征,同时从要素供给、社会化服务和产业链3个方面分析了影响四川玉米产业发展的制约因素。[结果]四川玉米消费结构呈现多元变化,从口粮消费为主转变为以饲料、工业加工消费为主;草食畜牧业发展迅速,饲用作物需求量增大;农业科技支撑力度明显,玉米育种成就突出。[结论]提出从优化品种结构、推行种养循环、培育新型经营主体、拓展产业链等方面推进四川玉米产业的转型升级。     

平衡膳食模式视角下粮食需求预测

[目的]随着时代的进步和社会经济的发展,对粮食安全内涵的理解也在逐步深化,粮食安全内涵不仅包括数量方面,还包括营养健康安全,保障居民营养健康成为粮食安全的新时代内涵。基于营养目标的粮食需求研究,建立营养—消费—生产的粮食生产模式,对引导居民合理健康消费和保障粮食安全具有十分重要的意义。[方法]文章首先分析了我国城乡居民营养消费状况,然后基于平衡膳食模式视角,引入标准人消费系数这一概念对我国未来粮食需求进行了更准确的预测。[结果]城镇居民粮食消费已达到高营养目标,但目前农村居民仅达到低营养目标水平,相当于21世纪初的城镇消费水平;考虑人口结构因素,2020年和2030年粮食需求总量分别为4.8亿t和5.6亿t,比没有考虑人口结构变化时分别减少8700万t和2 600万t。[结论]根据分析结果,提出以下几点政策建议:(1)宣传普及营养健康消费知识,引导居民合理膳食;(2)关注人口结构变动,及时调整粮食安全调控机制;(3)优化食品工业的产业机构升级,提高饲料粮转化率。     

甘肃省食用植物油供需波动变化研究

食用植物油是人民群众的生活必需品,其消费量已成为衡量一个国家人民生活水平的重要标志,并在国家食物安全中占有重要的地位,保障其供给安全,对促进经济发展和社会稳定具有重要意义。文章收集整理了1978~2012年甘肃省油料作物和食用植物油相关数据,运用速度法和数理统计等方法,从产量、供给、需求、消费量、库存消费比等方面,分析研究甘肃省食用植物油供需波动变化情况。研究得出油料市场供给基本满足消费需求,但油料作物种植发展缓慢,产业化水平较低;食用植物油供需波动处于紧平衡状态,自给率仅为76%左右,省外购进的量远远大于外销量,消费需求的增长速度超过产量的增长,食用植物油缺口较大,同时存在种植品种与加工品种、品种结构与市场需求、区域性产销不协调之处。通过综合分析研究,构建了"以自给为主,贸易调剂为铺"的供给模式,提出了提高食用植物油安全供给的政策选择,为甘肃省食用植物油发展提供了新思路和科学依据,对保障甘肃省食用植物油安全供给具有重要意义。     

粮食需求预测方法述评

在国内外24篇有代表性的粮食需求预测文献基础上,文章重点对这些文献的预测时间、预测结果、预测方法、预测的地区、城乡和品种差异进行了比较分析.现有文献的3个主要特点是:首先,定性分析、时间序列模型和联立方程模型是最常见的三种方法,单方程模型和其他方法应用较少;第二,文献集中关注2010 ～2030的粮食需求预测,且在相同时间点不同文献的预测结果比较接近;第三,在预测中,少数文献关注地区差异、城乡差异或品种差异,并且同时关注3种差异的只有1篇.在对现有文献评价基础上,文章提出粮食需求预测领域应进一步深入研究的方向.     

Modelling tourist flow association for tourism demand forecasting

The purpose of this study is to examine tourism demand for Singapore from 1995 to 2013 by six major origin countries which belong to three different regions. Unlike prior tourism research, we take into account the dependence relations among the different tourist flows via copula. Copula is a statistical model of dependence and measurement of association. Specifically, we investigate the association between two tourist flows in each region. Based on empirical copula estimation, the Frank function has been identified as the most appropriate to capture the pairwise dependence structures of tourist flows. The copula-based approach combined with econometric models is proposed for tourism demand analysis that can be used to predict tourist arrivals. We apply the copula-ARDL and copula-ECM frameworks to generate joint forecasts of tourist arrivals from three regions. The findings show that the forecast performance of the Frank copula-based model outperforms the benchmark model which corresponds to the independence structure (no association) of tourist flows.     

Towards a geography of tourism

This paper traces the development of geographical interest in tourism during the past half century and examines the range and scope of the geography of tourism. The available literature is reviewed and suggestions are made regarding possible research aveneus and theoretical developments. Six major areas of interest are identified: spatial aspects of supply, spatial aspects of demand, the geography of resorts, patterns of movements and flows, the impact of tourism, and models of tourist space. Through an emphasis on spatial interaction an attempt is made to provide some cohesion and synthesis for this body of knowledge which constitutes the basis of the geography of tourism.     

The geography of tourism: An introduction

The geography of tourism is limited by a dearth of published research in geographic journals, the relatively few individuals who actively participate in the sub-discipline, and the lack of prestige the subject matter specialty has in geography. Despite these imperfections geographers make important contributions to the study of tourism because of their unique point-of-view. This characteristic perspective is seen in the context of a conceptual frame-of-reference which consists of a matrix based on two trichotomies. An analysis and interpretation of this framework and its application to the nine substantive articles included in the special issue constitute a majority of the article.     

Implementing market segmentation using full-refund and no-refund customer returns policies in a dual-channel supply chain structure

Products returned by customers are common in the retail industry and result in costs to both the supplier and the retailer. In practice, retailers implement returns policies that may give customers a full, partial, or no refund for returned products. In this paper, we examine how a firm that faces customer returns can enhance profit by using different customer returns policies, full-refund and no-returns, as a device to segment its market into a dual-channel structure. We also show the impact of customer returns on the firm's pricing and ordering decisions, as well as on the firm's profit in such a dual-channel structure.     

成功的市场进驻策略是决定市场地位的关键——宝洁公司在中国的市场进驻成功个案

美国宝洁公司在中国改革开放之际,敏锐地察觉到中国市场的巨大潜力,向中国日用品市场进驻。在多元品牌政策和差异性市场策略的总体策略指引下,宝洁公司充分考虑中国经济,政治,文化背景,以中国东西部经济差距,城乡消费者需求差异,中国消费者对传统文化的要求和可持续发展为基础,开发具有中国传统品味的高科技环保产品,建立特殊的分销体系,建立了在中国市场的首席地位。同时,宝洁公司以遵守中国法律,履行社会责任和道德准则为己任,与当地政府配合,协助开展文化和经济辅导活动,保护生态环境与自然资源,在消费者心目中建立了良好的企业形象,为进一步发展提供了有利基础,达到了双赢的目的。