城市核心区旧城改造的典型困境与突破思路

在城市的发展史中,城市更新是永恒的命题。城市核心区旧城改造对土地集约利用、重塑城市增长极、提升城市形象、重塑城市特色意义重大。但旧城改造面临利益格局复杂、协调成本高、居民普遍贫困、优势区位推高开发成本、原迁还模式未能显著改善居民生存状态等一系列问题。因此,今后城市核心区旧城改造应遵循以下思路：保障居民生存条件优化,保障性住房政策可以加入到旧城改造项目;政企民多方合作、互利共赢;审慎选择注重长远利益的开发主体;保障区域文脉的延续与空间的协调等。     

中国出口中间产品市场集中度:质量竞争还是价格竞争?

文章利用2000~2006年中国海关微观数据,采用产品的单位价格和赫尔芬达尔-赫希曼指数(HHI)分别测度产品的质量和市场集中度,考察了中国出口中间产品的质量对其市场集中度的影响。实证研究表明,单位价格测度的中间产品质量对市场集中度有显著的负向影响,这意味着宏观上中国中间产品出口企业没有采用质量竞争策略提高市场份额,而是采用价格竞争策略来获得市场份额。实证研究还发现,进口中间产品质量、双边中间产品贸易规模、出口企业数量和贸易国收入水平对中国出口中间产品市场集中度有负向影响,而中国行业平均工资和行业人均固定资产对中国出口产品市场集中度具有正向影响。     

关于中国跨国油气管道安全问题的思考

近年来,我国能源对外依存度不断提高,我国通过多条跨国管道保障国家的能源供应安全。本文简要介绍了我国陆上油气通道的情况,分析了这些跨国油气管道所面临的政治、社会、宗教、战争等风险,提出了应对这些风险的措施,供相关企业及部门参考。     

Oil shocks,policy uncertainty and stock returns in China

This paper examines the interdependence of China's policy uncertainty, the global oil market and stock market returns in China. A structural VAR model is estimated that shows that a positive shock to economic policy uncertainty in China has a delayed negative effect on global oil production, real oil prices and real stock market returns. Shocks to oil market‐specific demand significantly raise China's economic policy uncertainty and reduce the real stock market returns. As measured by a spillover index, the interdependence between these variables has been rising since 2003 as China's influence in the oil market has increased. An equivalent spillover index calculated for the US is smaller and has been largely flat over time.     

Revisiting the Concept of a Societal Orientation: Conceptualization and Delineation

Marketers have traditionally evaluated products and practices on the basis of whether something could be sold. It is also important to evaluate products and practices from a societal perspective, “Should a product be sold?” The first idea reflects a managerial orientation and what must be done to sell a product; the second idea reflects a societal orientation and the impact of selling a product. In relation to the second idea, the societal marketing concept was introduced in 1972. There has been little advancement in our understanding of a societal orientation since that time. The current study presents a conceptualization of a societal orientation based on a review of literature and qualitative interviews. The construct was conceptualized as “attention to the long-term well-being of individuals and society at large by enhancing positive impacts from and reducing negative effects associated with production and consumption of a product.” Five domains comprising a societal orientation are proposed: physical consequences, psychological well-being, social relationships, economic contribution, and environmental consciousness.     

正确把握大思路 配套推进分税制——兼与“纵向分两段，横向分两块”的主张商榷

本文认为,以分税制为基础的分级财政是市场经济新体制所要求的财政体制,需要在统一市场构建中逐步贯通运行这一财政体制,过渡措施不应凝固为实现中长期目标的障碍,要正确把握大思路,配套推进分税制。     

粮食生产对生态碳汇的影响研究

[目的]协同推进粮食安全与碳中和目标是当下中国的核心议题,但粮食生产对生态碳汇的影响尚不明确,文章尝试梳理粮食生产影响生态碳汇的作用机理,并实证甄别粮食生产影响生态碳汇的净效应。[方法]构建粮食生产影响生态碳汇的分析框架,利用2000—2017年中国县域面板数据,采用双向固定效应模型进行实证检验。[结果]基准分析表明,粮食生产对生态碳汇总量具有显著正向影响。异质性分析表明,复种指数的适度提升有助于发挥粮食生产的碳汇效应;相较于西部和东北地区,东部和中部地区粮食生产的碳汇效应更大。[结论]应重视粮食生产的碳汇属性,通过耕作制度调整等手段加强土壤保护,挖掘粮食生产的碳汇潜力;优化陆地绿色植被空间布局,降低农地、林地和草地等不同绿色植被碳汇的潜在冲突;基于区域差异,制定具有区域针对性的粮食安全与碳中和协同行动方案。     

Estimation of Binary Response Models With Endogenous Regressors

This paper reviews six approaches to binary response (y₁) structural forms with an endogenous regressor y₂: (i) the two‐stage least squares estimator‐like substitution approach, (ii) the control function approach, (iii) the system reduced‐form approach, (iv) the artificial instrumental regressor approach, (v) the transformed‐response instrumental variable estimator approach and (vi) the classical maximum likelihood estimator approach. The applicability of the six methods differs greatly, depending on whether y₂ is a continuously distributed random variable or a discrete transformation of a latent . We conduct a real‐data‐based simulation study, and provide an empirical illustration. Our overall recommendation is using (i) and (ii), as the others have undesirable features such as analytic complexity in (iii), computational difficulty in (iv) and (vi), and poor finite‐sample performance in (v).