Are auction revenues affected by rising art buyers’ premia? The case of early American art

The steady rise in the premiums charged to art buyers at auction (above hammer price) has been underway since 1992. This article, using a stable and bounded sample of repeat purchase of American works created before 1950, reveals that this tact has reduced hammer prices for that art. However, renewed and hyper-competitive efforts to bring more and higher quality art to market by the two main houses, Sotheby’s and Christie’s, have resulted in general profitability. Nevertheless, we calculate that a rise in buyers’ premia at Sotheby’s, a publically traded company, has reduced revenues and profits below their potential in the absence of such increases.     

山西省装备制造业集群企业合作与创新之间关系的经验分析

利用山西省装备制造业集群企业的数据,实证分析了集群企业的纵向合作和横向合作对综合创新、产品创新和流程创新的作用。结果表明:纵向合作是影响山西省装备制造业集群创新的重要因素,横向合作对产品创新的影响较为显著。     

扁平证券市场线和融资限制——中国股票市场的实证检验

资本资产定价模型（CAPM)在国际金融市场的实证检验结果往往呈现扁平证券市场线现象。一些学者认为融资限制是该现象的产生原因。本文旨在研究扁平证券市场线现象是否存在于中国股市,同时分析融资限制对中国股市证券市场线的影响。本文采用投资组合分析法对A股主板市场进行实证检验。本文研究发现：（1)扁平的证券市场线现象同样存在于中国股票市场中;（2)在中国股票市场中,融资限制与证券市场线的斜率呈负相关,与截距呈正相关,这符合融资限制理论;（3)以上两点发现同样存在于多因子定价模型中,这表明本文研究结果具有稳健性。       

Political foundations of the resource curse

In this paper we argue that the political incentives that resource endowments generate are the key to understanding whether or not they are a curse. We show: (1) politicians tend to over-extract natural resources relative to the efficient extraction path because they discount the future too much, and (2) resource booms improve the efficiency of the extraction path. However, (3) resource booms, by raising the value of being in power and by providing politicians with more resources which they can use to influence the outcome of elections, increase resource misallocation in the rest of the economy. (4) The overall impact of resource booms on the economy depends critically on institutions since these determine the extent to which political incentives map into policy outcomes. Countries with institutions that promote accountability and state competence will tend to benefit from resource booms since these institutions ameliorate the perverse political incentives that such booms create. Countries without such institutions however may suffer from a resource curse.     

Strategic environmental policy and the accumulation of knowledge

In dealing with a transnational pollutant-emitting duopoly welfare-maximising policy makers face two negative externalities: imperfect competition and unpriced emissions. Strategic environmental policy models show that these externalities involve a trade-off between reducing pollution and allowing for rent-seeking of the respective firm. This dilemma usually results in a suboptimal internalisation of the negative externality emerging from emissions. Indeed, the conventional model setup includes an R&D stage that enables the firms to mitigate regulation costs. But the typical one period configuration ignores that R&D expenditures create knowledge capital which is, due to its inherent cumulativeness, also effective in following periods. Our model analyses the established trade-off in a two period setting and therefore allows for an investigation of intertemporal knowledge accumulation. We find that the intertemporal effects provide an incentive for a policy maker to set a higher tax rate compared to a one-period setup which lessens the magnitude of the suboptimal internalisation of emissions. Under certain conditions even a tax rate above the Pigouvian level is possible in period 1.     

我国农业支持与农民收入和消费的再思考——基于整体性的多变量协整系统

把农民收入和消费及财政支农和农村金融置于一个框架下进行了考察。基于1978—2008年数据拟合的多变量协整模型较好地反映了我国农村经济的特点,结果表明,农业财政和金融在长期可显著提高农民收入,金融信贷在短期可有效扩大农民消费,并且农村金融体系较好地保证了内源融资的效率;消费方程反映出我国农民消费具有短视性特点,对同期收入过度敏感。     

联合国制裁影响下的朝鲜对外贸易特征

在梳理近年来联合国安理会对朝鲜系列制裁的基础上,以朝鲜与中国的贸易为重点,分析了朝鲜对外贸易的变化特点。结果显示:①联合国安理会的制裁使朝鲜对外贸易额及朝中贸易额同时出现了下降,其中朝鲜煤炭出口受制裁影响最大;②朝鲜对外贸易结构发生改变,服装类商品代替煤炭占据出口第一位;③随着制裁影响的深入,钢铁成为朝鲜最重要的出口商品,纺织原料和纺织制品、塑料制品、动植物产品成为朝鲜进口的主要商品;④朝鲜更倾向与中、俄两国发展对外贸易。     

The effects of environmental taxes and quotas on the optimal timing of emission reductions under Choquet–Brownian uncertainty

The effects of two environmental policy options for the reduction of pollution emissions, i.e. taxes and non-tradable quotas, are analyzed. In contrast to the prior literature this work endogenously takes into account the level of emissions before and after the adoption of the new environmental policy. The level of emissions is determined by solving the firm's profit maximization problem under taxes and fixed quotas. We find that the optimal adoption threshold under taxes is always larger than the adoption threshold under fixed quota, even in a setting characterized by ecological uncertainty and ambiguity – in the form of Choquet–Brownian motions – on future costs and benefits over adopting environmental policies.