研究生workshop由首都经济贸易大学国际经济管理学院主办。主要内容：一是研究生报告前沿或经典文献，二是研究生报告自己的研究或研究设想。论坛宗旨是：为学院师生搭建一个学术交流平台，营造浓厚学术氛围；通过对经典论著或前沿文献的研讨，拓宽研究生的理论视野，提升研究生的前沿方法运用能力，帮助研究生提高论文写作质量。

　　本期workshop

　　报告人：梁思源（2022级博士研究生）

　　导师：高静

　　报告论文：《Environmental taxation in the Bertrand differentiated duopoly:

　　New insights》Resource and Energy Economics，2022

　　作者：Ghina Abdul Baki , Walid Marrouch

　　《Bertrand差异化二元垄断中的环境税: 新见解》

　　

　　报告摘要：

　　We derive an optimal emission tax under imperfect competition among polluters, while

　　taking into account the significance of the spatial dimension for non-uniformly mixed pollutants. This setup reflects a large number of pollution scenarios across developed and developing countries. We build a partial equilibrium model that is based on Hotelling’s location model, and that is further generalized to include the polluters’ abatement levels.First, the firms’ locations are considered to be exogenous, but later we relax this assumption. Our results shed light on a trade-off between the environmental externality and the distortions resulting from the Bertrand competition. This trade-off is modulated by the locations of the two producers as well as preferences for a clean environment. Our results also indicate that, in the presence of more than one market failure, the principle of maximal differentiation is not always guaranteed. We further stress that designing a spatial emission tax is not too demanding in terms of regulator information. Lastly, we reveal that when environmental awareness is well-promoted, the green preference would be a cheaper anti-pollution instrument than emission taxes.

　　

　　报告人：崔同玮（2022级博士研究生）

　　导师：牛毅

　　报告论文：《Gibrat's Law for (All) Cities》American Economic Review，2004

　　作者：Jan Eeckhou

　　

　　报告摘要：Two empirical regularities concerning the size distribution of cities have repeatedly been established: Zipf’s law holds (the upper tail is Pareto), and city growth is proportionate. Census 2000 data are used covering the entire size distribution, not just the upper tail. The nontruncated distribution is shown to be lognormal, rather than Pareto. This provides a simple justification for the coexistence of proportionate growth and the resulting lognormal distribution. An equilibrium theory of local externalities that can explain the empirical size distribution of cities is proposed. The driving force is a random productivity process of local economies and the perfect mobility of workers.

　　

　　报告人：王璞（2020级博士研究生）

　　导师：李鲲鹏

　　报告论文：ESG是否能够产生超额收益？基于我国A股的实证检验

　　

　　报告摘要：ESG是否对公司价值产生正面影响，其背后的微观影响机制等问题在学术研究和实践过程中，尚未有清晰的答案。ESG因子是否影响股票价格，如何将ESG因子应用到投资实践并实现超额收益，及其背后的影响机制和路径，不管对于学术研究还是对于投资实践来说，是具有学术价值和现实意义的问题。本文从此问题出发，首先构建了ESG指标体系，运用机器学习方法构建收益率预测模型，检验是否能产生超额收益率。