Environmental Taxation and Vertical Cournot Oligopolies: How Eco-industries Matter

This article specifies what an optimal pollution tax should be when dealing with a vertical Cournot oligopoly. Polluting firms sell final goods to consumers and outsource their abatement activities to an environment industry. It is assumed that both markets are imperfectly competitive. Thus, the tax is a single instrument used to regulate three sorts of distortions, one negative externality and two restrictions in production. Consequently, the optimal tax rate is the result of a trade-off that depends on the firms’ market power along the vertical structure. A detailed analysis of Cournot-Nash equilibria in both markets is also performed. In this context, the efficiency of abatement activities plays a key-role. It gives a new understanding to the necessary conditions for the emergence of an eco-industrial sector.      

黑龙江省垂直绿化攀缘树种的筛选

在分析垂直绿化植物生长主要限制因子--土壤干旱与贫瘠的基础上,从黑龙江省山地植被中引种栽培19种攀援树种,对其生物学特性、生活习性、抗旱性等关键因素进行了试验研究。根据试验及露地栽培观察结果,采用百分法综合评价出17种适宜立体绿化的攀援树种,为立体绿化与植被恢复提供了更多可供参考的植物种类,以满足绿化中对景观多样性、植物多样性的要求。     

皖江城市群空间范围的界定

城市群空间范围的界定是城市群研究的基础。使用区位商方法确定芜湖和安庆为皖江城市群的中心城市,计算了中心城市在研究范围内的经济联系强度和经济联系隶属度,以此为基础,确定了皖江城市群的空间范围并划分了其空间腹地层次为：核心区（芜湖市、安庆市、马鞍山市、枞阳县、当涂县、怀宁县）;紧密腹地（合肥市、池州市、芜湖县、无为县、铜陵市、繁昌县）;竞争腹地（桐城市、巢湖市、东至县、和县、宣城市、潜山县、南陵县、望江县、庐江县、含山县、太湖县、滁州市、宿松县、肥西县）;边缘腹地（肥东县、铜陵县、岳西县、青阳县、全椒县、泾县、宁国市、石台县、郎溪县）。     

我国钢铁业产业内贸易的实证研究

文章从整体和分类两个层面上对我国钢产量居世界第一以来的钢铁业产业内贸易的水平和结构进行了实证研究。结果表明,我国钢铁业产业内贸易水平较低,贸易变动主要由产业间贸易引起;而且钢铁业的垂直型产业内贸易水平较低,产业内贸易以水平型产业内贸易为主。我国为此应该采取相关对策,促进钢铁业产业内贸易的发展。     

纵向财政失衡、FDI竞争与医疗卫生服务供给水平——兼论标尺竞争机制下地区间的策略性行为北大核心CSSCI

关于医疗卫生服务供给不足的原因一直是社会各界高度关注的重点话题,现行的财政分权制度常被认为是最主要的原因。本文尝试将表征现行财政分权制度特征的三个要素,即纵向财政失衡、地区FDI竞争和地区间竞争模仿的策略性行为,与医疗卫生服务供给水平纳入同一分析框架,在对其理论机制分析的基础上,利用2007-2018年277个地级及以上城市面板数据,实证考察它们之间的关系特征及机制路径。研究发现,纵向财政失衡与地区FDI竞争对医疗卫生服务供给水平均存在显著的抑制作用,同时,地区FDI竞争对纵向财政失衡的负向抑制作用具有正向调节效应。进一步分析发现,地方政府间的标尺竞争使其在医疗卫生服务供给行为上表现出明显的策略模仿,医疗卫生服务供给水平呈明显的空间溢出效应。异质性分析发现,发达地区医疗卫生服务供给水平受抑制的主因是FDI竞争所致,欠发达地区则主要缘于纵向财政失衡的显著影响。机制分析发现,纵向财政失衡通过作用于财政支出结构与医疗卫生支出效率两种方式实现对医疗卫生服务供给水平的抑制,而FDI竞争则主要是通过扭曲财政支出结构的方式实现其抑制作用。本文的研究丰富了医疗卫生服务供给不足制度性成因探寻的文献,对于如何全面推进新一轮财税体制改革、深化医疗卫生体制改革、优化政绩考核指标等具有借鉴意义。     

Market structure and demand-side substitutability of chained urban hotel segments

This study analyzes how the demand in hotel markets is divided amongst chained hotel segments. Hypotheses regarding consumers’ switching behavior due to changes in income levels and relative prices are tested using data from 25 major urban markets in the United States, encompassing segments ranging from luxury to economy over 43 quarters. The effects of differentiation and market concentration are also investigated in this context. The results suggest that leisure and individual consumers of the low-scale segments may be trading “up” to higher scales when their income increase, but that upscale segments’ corporate consumers are not necessarily trading “down” when Corporate Income fall. In addition, only low-scale segments appear to be substitutes to upscale segments, but the inverse seems not to be true. Also, properties in mid-range segments are found to be the only ones benefiting from a high market concentration, while low-scale properties turn out to be the ones gaining from differentiation through price.     

农业减量化：农户经营的规模逻辑及其证据

本文将农户分为五种类型,并将农地规模分解为地块规模、经营规模与连片规模,由此构建"农户类型—规模形式—减量化行为"的分析框架,进而阐明农户减量化的规模逻辑。基于农户问卷的实证分析表明:①对于所有样本农户来说,地块规模越大,减施量越高。其中,追求产量最大化的生产型小农,减施量与经营规模呈"倒U"型变化,而追求多元化经营的功能型小农,减施量随经营规模的扩大而增加;②农户连片规模扩大,减施量就增高,并且能够增强地块规模扩大以及经营规模扩大对减施的促进作用;③农户社会服务卷入程度加深,能够增强地块规模、经营规模和连片规模扩大对减施的促进作用。据此,农业减量化,应鼓励农户开展连片种植,形成生产性服务的市场容量,然后诱导服务供应商提供专业化服务,进而实现服务规模经营对农地规模经营的替代。     

Does distance matter in foreign direct investment sub-national location choice? Evidence from China

Multinational enterprises (MNEs) make investment decisions according to the distance factors at a sub-national level. This paper made estimates using the gravity model with provincial foreign direct investment (FDI) data from 2000 to 2012 and employed three concepts of distance. Our empirical results indicate that geographic distance and cultural distance have significant negative effects on FDI flow, whereas economic distance has a significant positive effect. It suggests that FDI prefers to locate in regions that are geographically and culturally close but economically distant from the home country, which further implies that FDI in China is dominated by vertical FDI. Our findings suggest that Chinese provincial governments should place emphasis on attracting FDI from culturally close countries and provide institutional support to encourage and promote horizontal FDI.     

Employment Dynamics and Linkages in the Rural Economy: Insights from Senegal

Evidence on rural wage employment is thin and lacks nuance for different employment sources, insights on dynamic effects, and an understanding of the channels of effects. We assess conceptually and empirically the direct and indirect welfare effects of entry and continuation in different types of wage employment in rural Senegal. Using panel data, fixed effects and first-difference estimation, we show substantial positive welfare and linkage effects. We find that participation in wage employment increases per capita income by 143%, and reduces poverty, poverty gap and food insecurity by, respectively, 63%, 89% and 48%. While the direct effect on income is larger for non-agricultural and contractual wage employment, the indirect income effects through self-employment are more pronounced for agricultural and casual wage employment. Our results imply that job creation is important for rural development, that wage employment in agriculture can lead to considerable growth multiplier effects, and that synergies exist between large-scale and small-scale agriculture.     

The organisation of urban agriculture in Cape Town,South Africa: A social capital perspective

This article explores urban agriculture in Cape Town and its organisational forms. Based on a literature review of peer-reviewed articles and grey literature, it examines the state of linkages among urban farmers and various supporting organisations of urban agriculture. Moreover, it examines the coordination of activities among key supporting organisations. By analysing the roles of state and non-state actors and linkages, the article discusses implications for the development of urban agriculture. This article suggests that a lack of effective coordination of initiatives among supporting actors presents a significant pitfall in the development of urban agriculture. Furthermore, the failure of farmers to self-organise is identified as equally detrimental. Therefore, it calls for improved synergies between state and non-state actors involved to ensure that the gains of urban agriculture are enhanced.