Using choice experiments to value catchment and estuary health in Tasmania with individual preference heterogeneity*

Choice experiments (CE) have become widespread as an approach to environmental valuation in both Australia and overseas. However, there are few valuation studies that have addressed natural resource management (NRM) changes in Tasmania. Furthermore, few studies have focussed on the estimation of estuary values. The CE study described in this paper aims to analyse community preferences for NRM options in the George catchment, Tasmania. Catchment health attributes were: the length of native riverside vegetation; the number of rare native animal and plant species in the George catchment; and area of healthy seagrass beds in the Georges Bay, which was used as a measure of estuary condition. Mixed logit models with interactions between socio‐economic variables and the choice attributes were estimated to account for systematic and random taste heterogeneity across respondents. Results reveal considerable variation in preferences towards the attributes and show that value estimates are significantly impacted by the way in which we account for preference heterogeneity. Preference heterogeneity thus needs to be considered when estimating community willingness‐to‐pay for environmental changes. This study further shows little responsiveness to the presented changes in estuary seagrass area.     

我国制造业进出口隐含污染分析:基于投入产出的方法

使用非竞争型投入产出表,核算了我国1976-2004年制造业28个行业6种污染物进出口隐含污染的BEET指标值和PTT指标值,并分析了我国进出口隐含污染的规模效应和结构效应。研究结果表明,我国进口和出口的规模效应为正且逐年增长,20世纪90年代以后出口规模效应逐渐大于进口规模效应;出口的结构效应基本小于零,进口的结构效应不明确,我国的产业结构调整和升级可能有利于减少我国进出口的净隐含污染量。此外,制造业出口隐含污染主要来源于纺织、塑料、机械设备和工业化学这四个行业。     

金融危机以来我国沿海港口货物吞吐量影响因素研究——兼论我国经济由外需拉动向内需驱动转型的一个证据

通过建立基于贸易引力模型的我国沿海港口货物吞吐量影响因素的VAR模型,分别考察了交通运输业固定投资、人民币汇率、世界经济状况和国内经济状况对我国沿海港口货物吞吐量的影响,并以金融危机以来的数据作为样本对该模型进行了实证检验。由脉冲响应和方差分解分析发现:世界经济发展状况对我国沿海港口货物吞吐量的影响最大,且世界经济的复苏将显著提高沿海港口货物吞吐量;交通运输业固定投资在经过一个滞后期后,也会对沿海港口货物吞吐量起到积极的作用;人民币汇率对我国沿海港口货物吞吐量的影响不可忽略,且汇率上升(即本币贬值)将提高沿海港口货物吞吐量;而国内经济发展状况则与我国沿海港口货物吞吐量之间并不存在显著的确定关系,这或表明我国经济的发展方式正由外需拉动向内需驱动转型。     

天津市七里海湿地土地利用结构优化配置

研究目的:研究兼顾生态效益和经济效益的天津市七里海湿地土地利用结构优化配置,为促进区域可持续发展提供依据。研究方法:运用多目标优化模型,将生态承载力、生态绿当量和经济效益作为生态效益和经济效益双优化表征,研究土地利用结构优化配置。研究结果:采用该方法获取的土地利用结构优化配置结果表明,研究区的土地利用结构得到优化,经济效益和生态效益得以兼顾,有利于当地实现持续健康发展。研究结论:利用多目标优化模型不但能够较好地协调利益相互竞争的多种目标,而且优化算法具有可靠的数学基础,可以成为区域土地利用结构优化的主要方法。     

Informal barriers and agricultural trade: does monetary integration matter?

EU enlargement and the recent sovereign‐debt crisis of Euro zone countries have revived the debate around the (European Monetary Union) EMU. In this article we ask how informal barriers to agricultural and food trade have changed since the introduction of the common European currency, and whether this evolution can be attributed to monetary integration. We focus on the foreign trade of the 11 EMU founder countries over a nine‐year period covering the creation of the EMU and find a diminishing marginal trade impact of both information and institutional barriers. We find a lower level of trade barriers, but cannot attribute this outcome to the introduction to the Euro.     

World market integration for export and food crops in developing countries: a case study for Mali and Nicaragua

Using a generalized error correction model, this article measures and compares market integration for export cash crops versus imported food crops for Mali and Nicaragua, and computes transmission elasticities between changes in the goods’ border and domestic prices. Both Mali and Nicaragua obtain the bulk of their export revenue from a particular agricultural commodity—cotton for Mali and coffee for Nicaragua—and both import the same key staple food of rice. To reap the economic gains from this trade specialization, the two countries’ agriculture must be well‐integrated into world markets. The two countries present an important policy contrast that affects their degree of world market integration and price transmission. In Mali, a parastatal enterprise controls its cotton industry, while Nicaragua has less state direction over agriculture. Reflecting this difference, the results show that for both its main export and import commodity, Nicaragua is more integrated into world markets and has higher price transmission than Mali. The results for Nicaragua also show much higher integration and price transmission for its main agricultural export (coffee) than its major import (rice).     

中国农村商业保险发展现状分析

论文分析了中国农村商业保险的发展历程和现实状况,针对目前影响农村商业保险发展的影响因素给出了政策和体制方面的解决方案。论文分析了中国农村商业保险保持良好发展态势、业务规模快速扩大、覆盖面逐步拓宽等现状,在如何有效发挥商业保险的救济和保障作用、如何拓宽商业保险在农村经济发展新模式等方面进行了探讨,并为中国农村商业保险的发展给出了有益的建议。     

海洋经济对国民经济的影响机制研究

本研究引入VAR模型,运用协整检验、因果检验及脉冲响应和方差分析的动态模拟手段实证分析1985～2008年我国海洋经济增长对国民经济的影响机制。结果表明：海洋经济增长能够促进后期国民经济增长,对国民经济的冲击表现出即期和延期效应,增长弹性呈先增后减的规律;海洋经济对沿海地区经济增长效果起效快,影响强劲,国民经济对海洋经济预测方差的作用贡献率不断提高,且沿海地区远高于全国。     

农户林权抵押贷款意愿及其影响因素分析——基于林业生产性融资需求的视角

利用四川省5个省级集体林权制度改革试点县(区)32个村508个农户调查数据,运用Logit模型对农户林权抵押贷款意愿及其影响因素进行实证分析。研究表明,在现行林权抵押贷款制度安排下,农户的性别、受教育年限、是否担任过村干部、非农就业人数比重、是否获得过信用贷款、投资风险承受能力、林木林产品销售比例、是否与企业签订购销合同和政府的支持等因素对农户林权抵押贷款意愿有显著影响。     

基于协同博弈模型的企业集群网络式创新策略

通过构建网络式创新的协同竞争博弈模型,得出影响网络式创新的参数,并在此基础上设计网络式合作创新的具体策略。