社会规范、环境规制与农户施肥行为选择研究

目的 依托社会规范与环境规制引导农户施肥行为选择,对提高农业生产效率实现农业绿色发展具有重要意义。方法 通过将农户施肥行为选择分为直接减少化肥施用量与采纳化肥替代技术两部分,构建多变量Probit模型。文章基于甘肃省895份农户调研数据,分析社会规范、环境规制对农户施肥行为选择的影响。结果 （1）社会规范对农户施肥行为选择有促进作用。社会规范的描述性规范和命令性规范既能促进农户采纳化肥替代技术,也对农户减少化肥施用有正向作用。（2）环境规制作用复杂。引导型规制能引导农户减少化肥施用量,却对农户采纳化肥替代技术有消极作用。激励型规制能促进农户采纳化肥替代技术,却会刺激农户过量施用化肥;（3）社会规范与环境规制对农户施肥行为选择存在交互作用,二者对农户采纳化肥替代技术的交互作用为正。结论 政府应改进引导型规制的技术培训方式,减少其对农户时间与动员成本的挤占,避免激起农户的抵触心理;调整激励型规制的方式方法,防范其在刺激化肥过量施用方面的负作用。此外,重视社会规范建设,发挥社会规范对环境规制的辅助与矫正作用,引导二者良性互动,协同发力。     

资源型城市问题演变路径分析

一部分资源型城市经济水平经过一段较快的增长之后,发展速度缓慢甚至停滞,并产生了普遍的地区性问题。造成我国资源型城市目前的困境,主要是地区经济发展过程中一些阻碍经济增长的问题没得到及时有效解决,以及资源经济价值相对优势时间差异。文章通过对产生这些问题的原因进行深入分析,试图提出解决资源型城市问题、促进城市和地区经济持续良性发展的有效方法。     

可持续发展视野下的中国人口控制目标

从可持续发展的视野看,我国的长远人口总量应该保持在6亿以下,而中长期总人口目标应设定为“十一五”时期末人口总量控制在13.4亿人以内;2020年人口总量控制在14亿人左右;2030年人口总量峰值为14.2亿人左右。在峰值以后,还要继续努力,到21世纪70年代以后使我国人口下降到6亿左右。     

Endogenous timing and the choice of quality in a vertically differentiated duopoly

The endogenous choice of timing is discussed in a vertically differentiated duopoly where quality improvement requires a fixed convex cost. The timing decision concerns the quality stage. Using an extended game with observable delay, it is shown that only simultaneous equilibria can arise. This puts into question the ability of Stackelberg games to describe the entry process.     

甘肃河西地区啤酒大麦产业化发展现状与对策

通过对甘肃河西地区啤酒大麦产业化发展优势、现状及存在问题的分析,提出了该区啤酒大麦产业化可持续发展中建立优质啤酒大麦产业化生产基地,加快优良品种引进与推广,以市场为导向、效益为纽带、培育和完善市场体系,增强龙头企业的辐射带动作用,全面优化市场秩序,完善生产经营,促进啤酒大麦生产健康发展的对策。     

How do trade openness,public expenditure and institutional performance affect unemployment in OIC countries? Evidence from the DCCE approach

This study explores the relationship between trade openness, public expenditure, institutional performance, and unemployment in member countries of the Organization of Islamic Cooperation (OIC) (formerly the Organization of the Islamic Conference). The conventional panel data techniques overlook cross-sectional dependence and yield-biased results. A new methodology called dynamic common correlated effects (DCCE) is employed to deal with the issue of cross-sectional dependence. The long-run results demonstrate that trade openness is inversely and significantly associated with overall unemployment and youth unemployment in lower-income as well as all the OIC economies and positively correlated in the higher-income OIC group. Public expenditure has an inverse and significant correlation with unemployment in OIC countries overall and higher-income OIC countries. Moreover, institutional performance and foreign direct investment are negatively related to unemployment in all OIC economies. The research shows the need for the continuation of open trade policies, strong institutions, and higher public expenditure in the OIC countries in order to decrease overall unemployment—in particular, youth unemployment.     

“互联网+”背景下兰州市特色农产品物流发展研究

近年来互联网技术的应用,有效推动力了兰州市特色农产品物流的迅速发展,但目前发展水平并不高。文章通过对兰州特色农产品物流业的现状展开分析,发现目前仍存在物流成本高、基础设施不完善、信息化水平低、缺乏专业化物流人才等问题,基于此,提出相关对策建议,以期为兰州市特色农产品物流业的发展提供参考。     

Asymmetric causality of economic policy uncertainty and oil volatility index on time-varying nexus of the clean energy,carbon and green bond

Vigorously developing the clean energy industry, improving the carbon allowance trading scheme, and issuing green bonds can effectively reduce emissions. To this end, this study aims to investigate the time-varying connections among clean energy, carbon, and green bonds through the DCC-MIDAS model, thus providing a bird's-eye view of their dynamic nexus. A non-parametric causality-in-quantile method is also employed to adequately capture the asymmetric causation of economic policy uncertainty (EPU) and the oil volatility index (OVX) on cross-asset correlations under different market conditions. The primary results imply complicated links among these three assets, with alternating positive and negative trends throughout the sample period. Notably, turbulence in financial markets can exacerbate network connectivity, particularly during the COVID-19 pandemic. Moreover, EPU and OVX can serve as strong predictors across various distributions of cross-market connections, which indicates that co-movement between assets is vulnerable to exogenous risks, especially under normal market conditions. Our findings have broader implications for market participants and policymakers.     

农村环境治理问题与对策调查分析——以天水市杨王村为例

本文针对农村环境治理中存在的突出问题,对天水市杨王村进行了实地调查,发现以下几方面的特点:村民的不理解、不配合、治理资金的匮乏、治理主体责任划分模糊以及缺乏长效的监督管理机制是当前所面临的突出问题,文章对存在的问题进行原因分析,提出了如下建议,我们应不断提高环境保护意识,领导干部要积极树立榜样,建立合理的奖惩机制,积极筹措资金不断完善环境治理体系的建设,以保障美丽乡村目标的实现。