Stochastic volatility: A tale of co-jumps,non-normality,GMM and high frequency data

In this article we introduce a linear–quadratic volatility model with co-jumps and show how to calibrate this model to a rich dataset. We apply GMM and more specifically match the moments of realized power and multi-power variations, which are obtained from high-frequency stock market data. Our model incorporates two salient features: the setting of simultaneous jumps in both return process and volatility process and the superposition structure of a continuous linear–quadratic volatility process and a Lévy-driven Ornstein–Uhlenbeck process. We compare the quality of fit for several models, and show that our model outperforms the conventional jump diffusion or Bates model. Besides that, we find evidence that the jump sizes are not normally distributed and that our model performs best when the distribution of jump-sizes is only specified through certain (co-) moment conditions. Monte Carlo experiments are employed to confirm this.     

Energy efficiency promotion backfires under cap-and-trade

Major climate-cum-energy policies and respective impact projections rest on the widespread belief that increased energy efficiency can be equated with savings in energy use and emissions. This belief is flawed. Due to the rebound effect emissions savings from energy efficiency improvements will be generally less than what is technically feasible, or even be reversed. By means of an analytical general equilibrium model we demonstrate the latter to be true in a case that is both stark and relevant: if electricity generation is subject to a cap-and-trade scheme with partial coverage, increased efficiency of electric devices leads unambiguously to increased carbon emissions. The result implies that a proper distinction between the energy rebound and the carbon rebound is warranted, and that public policy must carefully consider the interactions between energy efficiency promotion and carbon pricing.     

Relationship between city size and firm productivity – A new interpretation using the Chinese experience

This paper contributes to the literature on the relationship between city size and firm productivity by focusing on agglomeration, selection (market competition), and sorting (presence of firms with diverse productivity) effects using Chinese firm-level data for 1998–2013. Contrary to the existing literature, our parametric regression estimates from nearly two million firms show that when the selection effect is controlled, productivity advantage in big cities is reversed. This outcome is explained through a quantile regression showing the existence of left-sided sorting (inefficient firms sort themselves to larger cities) in big cities which is not captured in existing empirical literature. We further find that (1) left-sided sorting is stronger in exporters than non-exporters; (2) is also generated mainly in enterprises with high asset-liability ratios; and (3) selection has a positive effect on firm productivity, suggesting that market competition is key in an explanation of the rapid growth of big cities in China.     

Macroeconomic effects of structural reforms and fiscal consolidations: Trade-offs and complementarities

This paper studies the impact of product and labour market structural reforms and the effects of their joint implementation with alternative debt consolidation strategies. The set-up is a dynamic general equilibrium model calibrated for the Greek economy. The results show that structural reforms produce important long-run GDP gains that materialize earlier, the faster the reforms are implemented. When implemented jointly with fiscal consolidations, structural reforms may amplify the short-run costs of fiscal tightening. The GDP dynamics depend on the fiscal instrument used for public debt consolidation. In the long run, however, there are complementarity gains irrespective of the fiscal instrument used.     

论著作权法对“创作者特权”的确认与限制——以“鬼吹灯”案中的作者续写权利主张为切入点

“创作自由”与“创作者的自由”是一对容易混淆的概念,《著作权法》对于这两类自由采取了不同的确认方式,不宜仅基于“创作自由”的话语扩张“创作者特权”,乃至将其主张为著作权法上的专有权利。“鬼吹灯”同人作品案中被控侵权人主张的“系列故事续写权”实为一种积极权利,不同于一审判决和既有研究中确认的消极权利,因而违背了《著作权法》第1条和第10条中对于“创作者特权”及其专有权利化主张的限制。该类主张的背景是两大法系中作品观融合导致了对于作者权益的挤压,作者权理念在法律实践中出现了反弹。从现代社会中创新的复合属性、版权利益分配格局的自发形成、我国社会中通行的权利观念等角度出发,应当坚守《著作权法》对于创作者自由的既有确认与限制机制。民法典对于一般人格权的保护则能够提供外部的制度协同。     

应对疫情冲击的财税政策建议

公共财政的主要职能就是提供满足公共需要的产品与服务,公共卫生是其重要组成部分。面对新冠肺炎疫情,财政需要在支持抓好疫情防控工作的前提下,深入系统分析新冠肺炎疫情对我国经济社会发展造成的影响,进一步发挥财政职能作用,帮助企业渡过难关、恢复生产,努力保持经济社会平稳健康发展。     

Distance measures between free trade and autarky for the world economy

We develop a methodology to determine numerically how globalized the world economy is. We present a global general equilibrium model capturing major OECD economies and a residual rest of world for which alternative metrics of distance between observed, free trade and autarky equilibria can be developed. We use data for 2000 and report a number of distance measures between the 2000 observed trade restricted equilibrium and both free trade and autarky equilibria noting the absence of prior literature on metrics of distance between equilibria. The measures are used to determine the degree to which the world economy is globalized.     

货币冲击与中国经济波动——基于DSGE模型的数量分析

基于1993~2008年的季度数据,本文在一个包含Calvo价格粘性的新凯恩斯主义模型中,讨论了中国货币冲击与经济增长的关系。在假定货币政策通过调整货币供给增长实施的前提下,本文根据模型模拟和实际数据的对比以及脉冲响应函数分析得出以下结论:(1)货币并非我国经济波动根源,实际产出对货币供给具有一定反馈作用。(2)通货膨胀的顺周期性和领先增长表明中国经济周期存在总需求拉动的特性。物价波动在中短期主要由货币供应量波动引起。(3)货币政策对实体经济有效但效果有限,货币供给变动对投资的作用效力更大,对消费需求刺激有限。     

论美国关税法337条款在GATT1994下的合法性——基于国际判例的思考

对337条款在GATT1994下合法性的正确评判,将会影响对337条款的态度及应对策略的制定.20世纪80年代,加拿大和欧共体曾经分别在关贸总协定体系内挑战过337条款的合法性.第一个案件专家组报告肯定了该案中337条款的合法性,第二个案件专家组报告对337条款的合法性总体上予以肯定,但也指出了337条款四个具体违法之...     

我国一般反避税规则的不足与完善

我国企业所得税法确立了一般反避税规则。这一反避税规则对有效打击避税行为具有重大意义。但是,我国的一般反避税规则还有诸多不完善之处,需要我们进一步改进和完善。本文简要分析了我国一般反避税规则在相关术语使用上的不一致性、自身较强的不确定性以及一般反避税调查程序中的不足,并提出了对一般反避税规则的改进。