基于联合分析法的城市住区绿地雨水设施 居民喜好度研究

城市化进程带来如城市内涝等诸多环境问题，使得 海绵城市和低影响开发成为热点。城市住区绿地作为城市绿地 的一个重要类型，既是住区居民重要的景观游憩场地，也是海 绵城市低影响开发的重要海绵体，是兼具径流绩效和景观绩效 等综合绩效的复合设施。如何让雨水设施在发挥径流绩效的同 时兼具满足居民需求的景观绩效，是目前相关研究的难点和热 点。居民喜好度的研究是住区绿地雨水设施景观绩效优化提升 的重要方法之一。通过联合分析法，遴选雨水收集、雨水转 输和雨水调蓄3个环节的源头减排雨水设施，模拟江南住区中 心绿地雨水设施场景收集居民评价，进行不同居民群体的设 施喜好度效用值相关性统计和住区绿地不同类型雨水设施效 用值及相对重要性分析。并通过走访、文献查阅解析所得数 据，为住区绿地雨水设施景观绩效提升和低影响开发设计提 供启示和借鉴。     

Time preference and international trade

We first consider a closed model, where households' time discount depends on externality in consumption. We can prove that there is a unique steady state, which is a saddle point. Then we extend the model to a two‐country world, and derive the condition on the effects of consumption externality under which there is a unique free trade steady state with saddle‐point stability.     

重男轻女观念会加剧当地家族企业的机会主义动机吗——以家族企业上市公司为例

本文基于重男轻女观念的视角，探究地区文化是否会影响当地家族企业的机会主义动机。本文研究发现，重男轻女地区的家族企业更愿意安排男性家族成员担任CEO等重要职位，更多地引入家族成员参与企业经营。由于担心这种机会主义行为，外部投资者对当地家族企业的投资更为谨慎。本文从地区文化的视角阐释了家族企业的异质性，推动了已有研究从“家族企业与非家族企业有何不同”向“不同地区文化下的家族企业间有何不同”层面深入。     

Consumer Preferences for Fresh Tomatoes in Benin using a Conjoint Analysis

Constraints related to the technical and socioeconomic aspects of adopting tomato varieties are well documented. However, preferences relating to the demand for this fruit are rarely studied. In fact, demand for the different varieties of tomatoes might be related to consumers’ preferences for the extrinsic (color, size) and intrinsic (taste, nutritive value, water content) characteristics specific to each variety. It is therefore indispensable to determine the characteristics of tomatoes preferred by consumers. We examine consumers’ preferences for tomato attributes among a sample of 600 consumers in four representative markets in the main cities in southern Benin. The study also identifies potential segments of consumers and the market shares of each profile for each segment. The study identifies four potential tomato market segments, two of which have a strong preference for local tomatoes, namely, those that can be conserved for long periods and those with a firm consistency.     

Financing the sustainable management of Rwanda's protected areas

Rwanda's Nyungwe National Park is a biodiversity hotspot with the most endemic species in the ecoregion and the highest number of threatened species internationally. Nyungwe supplies critical ecosystem services to the Rwandan population including water provisioning and tourism services. Tourism in the Park has strong potential for financing enhanced visitor experiences and the sustainable management of the Park. This paper explores quantitatively the economic impacts of adjustment in Park visitation fees and tourism demand as a source of revenues to improve Park tourism opportunities and ongoing operations and maintenance. The methods developed in this paper are novel in integrating the results of stated preference techniques with a regional computable general equilibrium modelling approach to capture multisectoral, direct, indirect and induced impacts. Such methods have strong potential for assessing revenue generation alternatives in other contexts where park managers are faced with the need to generate additional revenue for sustainable park management while facing diminishing budget allocations. Results of this analysis demonstrate that adjustment of Park fees has a relatively small impact on the regional economy and well-being when compared with a strategy aimed at generating increased tourism demand through investment in improving the visitor experience at Nyungwe National Park.     

管理层权力与或有事项信息披露——基于环境不确定性的调节效应研究

基于2003—2016年我国A股上市公司的经验数据，以企业表内列报的预计负债金额与表外附注中披露的或有事项频数为考察对象，实证检验了管理层权力对或有事项信息披露的影响。研究发现，管理层权力与表内列报的或有事项信息显著负相关，而与表外披露的或有事项信息显著正相关；进一步发现，随着环境不确定性的增加，管理层权力对企业表内预计负债列报的负向影响显著增强，而对表外或有事项披露的正向影响明显减弱。在当前外部环境瞬息万变、内部治理机制弱化的背景下，管理层可能会利用其控制权操控或有事项信息的披露方式，自我服务偏好明显。     

政府审计、内部控制与企业创新

利用手工收集的政府审计公告数据，以2013—2017年的国有上市公司为样本，采用PSM+DID方法检验政府审计对国有上市公司创新活动的影响，并进一步根据内部控制质量和是否存在内部控制缺陷对样本进行分组检验两者之间的关系。研究结果表明：政府审计显著增加了国有上市公司的创新投入和创新产出；在内部控制质量高和不存在内部控制缺陷的样本企业中，政府审计对企业创新活动的促进作用更加显著。     

土地价格与企业创新*——来自微观数据的证据

近年来，中国土地出让价格迅速攀升，对企业行为产生了重要的影响。本文利用土地交易的微观数据，采用工具变量的方法研究了土地价格上涨对于工业企业创新的影响。研究发现土地价格上涨会减少企业申请专利的数量。其原因在于地价上涨缩紧了企业的资金约束，并影响了企业的资源配置，造成企业减少研发投入。异质性研究表明，高地价对位于产业园区的企业、国有企业的不利影响更小，但是对创新型试点城市中的企业的抑制作用更强。     

The Effect of the Interaction between Price and Time Preference on Cigarette Consumption among Pregnant Women

In this study, I explore smoking behavior among pregnant U.S. women using the 1979 cohort of the National Longitudinal Survey of Youth. The key aspect of this study is the availability of smoking participation data before and during pregnancy. I consider the probabilities of smoking cessation while pregnant as the outcome. I find that pregnant women who smoke are less responsive to price changes when they are more future-oriented. Women who are more present-oriented are more likely to smoke and consume more cigarettes given that they smoke more than those who are future-oriented. Moreover, those who discount the future more heavily are more sensitive to the money price of cigarettes than those who are more future-oriented. I focus on the role of time preference and the interaction between time preference and price in determining these outcomes.