农户分化、乡土依赖与集体收益分配权退出

基于3个农村改革试验区716个农户的微观数据,实证分析农户分化、乡土依赖对农户集体收益分配权退出意愿的影响。结果表明,农户的不断分化并未提高其集体收益分配权退出意愿,分化程度较高的农户更倾向于继续持有集体收益分配权,土地、宅基地的退出对集体收益分配权退出意愿未产生显著影响,但对所在村的心理依赖水平有着显著的反向影响,即在集体收益分配权的退出中,对其退出意愿产生影响的更多是农户对乡土的心理依赖,而非现实依赖。这要求在进一步探索中,既要有改革的紧迫感,完善退出机制,引导符合条件的农户理性退出集体收益分配权,也要有历史的耐心,充分尊重农户的乡土情结。     

Deme formation in gall-making aphidsAdelges japonicus (Homoptera: Adelgidae)

The deme formation hypothesis in herbivorous insects states that herbivores differentiate genetically into small demes, each specialized in the idiosyncratic traits of individual plants. We examined this hypothesis in gall-forming aphids,Adelges japonicus, by reciprocal transfers of aphids among three susceptible clones ofPicea jezoensis standing in proximity. Performance of aphids transferred to their natal clone was compared with that of aphids transferred to other novel clones. ANCOVA showed no significant donor (source of aphids) by receptor (recipient of aphids) interactions for both total aphid performance on the host tree over a life cycle and its three subdivisions(q ₁,q ₂ andq ₃). In addition, the total performance on the natal clone was lowest among those in the three clones, which was explicitly against the prediction from the local adaptation. In contrast, there were significant receptor effects onq ₁ (fecundity of gallicolae multiplied by survivorship of fundatrices while feeding on needles) andq ₃ (fecundity of fundatrices multiplied by survivorship of gallicolae before emergence from the galls), suggesting genetic differences in resistance among clones. The two-fold difference inq ₃ among clones was due to different gall size, which was highly correlated with the number of gallicolae that emerged from the gall. The two-fold difference inq ₁ seemed to be caused by different survivorship of larval fundatrices while feeding on needles.     

从《香港船头货价纸》看中国早期经济报纸

作为我国历史上最早的经济类报纸,《香港船头货价纸》主要面向商铺刊登以船务船期为主的经济信息与广告,内容宽泛,富有实用性,体现出了经济类报纸最为本质的特性:服务性。     

试探人力资源价值与价格的计量

如何从定量的角度来分析和计量人力资源的市场价值和价格 ,已成为人们讨论的重要课题之一。本文先试探分析人力资源的市场价值 ,以此为基础再分析人力资源个体的市场价格的确定与计量 ,提出了人才的市场价值模型和市场价格模型     

比喻性"N1的N2"定中结构的甄别与认定

比喻性"N1的N2"定中结构在现代诗歌、散文中大量涌现,已成为一种不可忽视的语言现象,但以往的研究对其关注不够,并在认定该结构时有不够准确的情况.本文通过语料调查增补了大量新鲜例句;对非比喻性"N1的N2"定中结构进行了排除;在以往研究的基础上,利用谓词隐含理论,通过还原该结构的谓词,提出了认定该类结构的方法.     

“华夷之辨”对民族融合的影响——兼与刘锋焘先生商榷

“华夷之辨”的核心是文化之辨,强调保卫先进的华夏文化以求发展,反对屈从落后的夷狄习俗而倒退苟安。这一观念,促成了一种凝重执著的民族凝聚力和向心力,促使了各少数民族向汉文化靠拢而融合为一个民族。特别是在少数民族建立政权时,它成为排斥落后文化,保证中华文化传承、延续的思想武器。因此,“‘华夷之辨’对中华民族史的负面影响”之说需要商榷。     

浅析我国房地产市场过热现象

近年来中国房地产市场越炒越热,房价一路水涨船高,且有继续上涨的趋势。很多人认为房地产市场存在过热现象。房价在近年来迅速上升的原因主要包括人们的收入水平普遍提高,城市化进程加快,土地成本和建筑成本的升高,金融政策比较宽松,人们对房价继续上升的预期,以及海外热钱的涌入。存在的问题主要是供求结构不合理,存在投机行为和金融隐患。建议采取加强土地管理,提高利率以及市场多元化等措施加以调控。     

Consumer Effort in Promotional Incentives

Consumers need to exert effort to use the incentives provided in a promotion campaign. This effort is critical in the consumers’ decision process and for the success of the campaign. We develop a model of consumer redemption effort that is general in nature and is applicable to coupons, rebates, and other price‐discrimination devices. We find that the impact of redemption effort is quite intricate on a firm’s profit and consumers’ surplus. We find that there are cases where a firm would like to operate in a low redemption cost environment while consumers would be better off with higher costs. We identify cases where price can remain the same with or without the promotion. In these cases, it is possible that the surplus for each individual consumer is higher when a firm price discriminates and improves its profit. Our results indicate that a firm would rather have variation in consumer redemption costs than to have variation in consumer valuations. However, in a market with low valuation variability, consumer redemption cost variability is essential for an efficient promotion campaign. Therefore, the markets that naturally have a lot of variability in consumer valuations should be the ones targeted for online promotion programs that reduce consumer effort levels, not the markets with low variability.     

水利投资减灾效果评估:基于中国省际面板数据的实证研究

利用省际面板数据,从全国及区域层面研究新增水利投资、各类型水利设施在抗击农业旱灾、水灾中的效果。研究发现：从全国层面看,新增水利投资能有效降低旱灾成灾率、水灾成灾率,但水利投资抗旱效果比抗击水灾效果好。水库能有效抗旱,但加重了水灾成灾率,水闸抗旱效果明显。从区域层面看,东、中、西部地区水利投资抗旱效果都较明显,而水利投资抗御水灾效果东部地区最明显。机井在中部地区对抗旱起到了一定作用,但东部、西部地区机井数量却与旱灾成灾率正相关。水闸抗御水灾的作用在中部地区显著。中部地区堤防长度与水灾成灾率正相关,西部地区机电排灌站装机容量与旱灾成灾率正相关。东部地区机电排灌站装机容量与水灾成灾率负相关,而在中部地区两者正相关。     

精准扶贫背景下贫困山区旅游扶贫效率研究——以安徽皖南山区18个县(区、市)为例

皖南山区旅游扶贫效率接近中等水平,区域差异大但呈波状缩小趋势。现阶段,旅游扶贫的主要支撑为规模效率,快速的旅游发展、不断扩大的旅游业规模是提升旅游扶贫效率的有效途径。技术进步是导致全要素生产率指数波动的主要因素,旅游体制机制、旅游模式创新是进一步提高其扶贫效率的核心路径。旅游扶贫效率由"局部突出,环线梯度"的点状格局向"四周连片,中部塌陷"的漏斗状格局演化,旅游产业出现外溢。为提升区域旅游扶贫效率,应根据潜力期、朝阳期、黄金期、夕阳期不同的效率形态类型,实施精准的旅游扶贫模式。