No‐arbitrage implies power‐law market impact and rough volatility

Market impact is the link between the volume of a (large) order and the price move during and after the execution of this order. We show that in a quite general framework, under no‐arbitrage assumption, the market impact function can only be of power‐law type. Furthermore, we prove this implies that the macroscopic price is diffusive with rough volatility, with a one‐to‐one correspondence between the exponent of the impact function and the Hurst parameter of the volatility. Hence, we simply explain the universal rough behavior of the volatility as a consequence of the no‐arbitrage property. From a mathematical viewpoint, our study relies, in particular, on new results about hyper‐rough stochastic Volterra equations.     

论物保与人保并存纠纷中债权实现之顺位——以近五年来类案实证研究为基础

当前,物保与人保并存纠纷不断涌现，相关裁判时常冲突，引发社会关注。围绕当前物保与人保并存纠纷债权实现条款模式、关于物保与人保并存债权实现顺位之理解、债权人是否放弃物保之认定等相关问题，对近五年来最为主要的类案进行实证分析与比较研究可见，处理物保与人保并存纠纷，应当根据物保相对优先的精神，对保证人是否就放弃物保优先抗辩权重点作出判断，据此就物保与人保提供者的责任顺位作出正确裁决。     

审计质量、产权性质对上市公司投资效率的影响研究

审计质量作为第三方会计师事务所为公司提供的服务,可以独立于公司之外对上市公司投资活动进行监督。根据产权理论,产权性质不同的经济组织从事的经济活动不同,审计质量对不同产权性质的上市公司投资效率的影响也不相同。本文以2014—2018年沪深两市上市公司作为样本,实证检验了审计质量、产权性质与公司投资效率间的关系。研究发现,审计质量与上市公司投资过度显著负相关,与投资不足负相关但作用并不明显;在国有上市公司中审计质量对投资过度行为的抑制作用更明显,在非国有上市公司中审计质量可以在一定程度上防止投资不足行为的发生但作用并不显著。研究结论有利于启示各不同产权性质公司的利益相关方,客观认识审计师的作用功能及其局限性,有针对性、有效率地利用好审计服务,改善公司投资效率。     

政府补贴、国际知识产权保护与企业创新——来自战略性新兴产业上市公司的证据

政府补贴对企业创新的影响存在争议,在美国重点打击中国战略性新兴产业的背景下,补贴这一产业政策的有效性再次引起热议。本文以2012-2017年沪深A股战略性新兴产业上市公司为样本,研究在国际知识产权保护加强的背景下政府补贴对战略性新兴产业创新绩效的影响。研究发现:中国政府实施的补贴政策有利于促进战略性新兴产业创新,但国际知识产权保护加强约束了中国政府补贴的规模和空间,从而抑制了补贴政策对战略性新兴产业创新的激励作用;此外,基于企业和产业异质性视角,国际知识产权保护的加强主要抑制了补贴对国有企业、内资企业和新材料产业创新的促进作用。进一步完善补贴政策和国内的知识产权保护制度,有利于提升中国在构建国际经济新秩序中的话语权。     

新型个人信息保护体系构建研究

大数据时代,传统的以“信息收集”规制为着力点的个人信息保护出现适法性困境,以“知情同意”为框架的机理失灵,个人信息的利用对象从直接个人信息逐渐向间接个人信息过渡,其财产价值凸显,新型个人信息财产权呼之欲出。立法应顺应数字经济的发展,构建合理新型个人信息体系。具体而言:纵向层面,以“宽进+删除权”为具体保护策略;横向层面,在信息主体和信息产业者之间合理配置权利,即信息主体享有个人信息权和个人信息财产权,信息产业者享有信息资产权。     

International free riding on institutions

Economic institutions are linked to economic growth because they create conditions favourable for production and exchange. Institutions can give a country comparative advantage in producing some goods. If its trading partners lack such institutions, it can still enjoy their benefits by importing these goods. Some institutions, such as intellectual property rights, have non‐excludable benefits because the resulting production is intangible, non‐rival, and often publicly disclosed. The profits, or surplus, that result, however, is rival. Foreign countries can ‘free ride’ on this benefit by misappropriating rival surplus through infringement. This article develops a theory of institutional free riding in which firms in one country free ride on the benefit of foreign institutions to the detriment of their competitor firms and their countries' institutions. It evaluates the incentives of firms and governments for this free riding, its effects, and potential responses to mitigate these effects.     

“城居保”对中国农村家庭消费支出异质性实证研究

[目的]全面分析城乡居民基本养老保险制度对农村家庭各项消费支出现状的影响,就进一步完善该项政策和稳定农村消费市场提供重要的理论参考。[方法]文章以消费和储蓄生命周期理论为分析框架,通过选取合理的样本面板数据,运用系统GMM回归分析方法探究了城乡居民基本养老保险制度对农村家庭消费支出水平的影响。[结果]财产性收入是影响农民参与城乡居民基本养老保险制度的主要因素以及投保档次的制约因素,作以存量财富为基础的财产性收入要比流量形式存在的财富具有更强抵御风险的能力,即财产性收入在很大程度上可以增加农村家庭对养老保险的依赖程度。另外,城乡居民基本养老保险制度对农村家庭消费能力表现出异质性影响。其中,城乡居民基本养老保险制度对农村家庭生活消费支出、食品性等日常性支出、文体消费支出水平明显要高于对医疗消费支出水平。[结论]国家要加大宣传城乡居民基本养老保险制度的积极和辐射作用,让广大农村家庭能够真正了解这项政策的意图。同时,要逐步破解城乡二元结构等制度性障碍,让更多农村家庭能够享受到与城镇居民相同的养老待遇。     

Digital Platforms and the Nature of the Firm

Abstract:

Digital platforms turn traditional approaches of the firm, which relied on the wage relation to explain the major difference between firm and market, upside down and underline the advantages of coordination through organization over coordination through market. This study aims to propose a definition of the firm able to integrate, besides the integrated firm, also hybrid forms such as networks of subcontractor/subcontracting firms as well as atypical forms such as digital platforms. By reactivating the firm-boundary problem, this article suggests putting valorization by labor at the heart of the firm’s decisions concerning integration. It suggests therefore a general definition of the firm as a techno-institutional center of capital valorization, provided that firms make profits by means of the appropriation of labor incorporated into their (productive, structural, intellectual) capital through institutional arrangements. By stressing the relation of production between the owners of the means of production and the direct producers, the approach of the firm supported here should allow to cover the different existing models of the firm, from the classical firm to hybrid models, around which the boundary debate has revolved, to digital platforms.     

农地权益保障与农业转移人口市民化

研究目的：明晰农地权益对农业转移人口市民化的影响，进而揭示当前全国各地对农业转移人口农地权益保护状况。研究方法：基于Probit模型的实证分析。研究结果：（1）从全国范围来看，农业转移人口的农地权益只得到部分保障；（2）农地权益保障状况存在较大的地区差异，区域经济越发达，农地权益保障越完善；（3）农地权益只得到部分保障对推动农业转移人口向城市迁移起着促进作用，但却对农业转移人口市民化有着显著负面影响。研究结论：农地权益保障是农业转移人口市民化的重要影响因素，农地权益的不充分保障对农业转移人口市民化具有负面影响，而经济越不发达的地区这种影响越显著。     

中美贸易战的危害与对策

分析中美国情现状,对中美经济状况进行对比,对美国发动贸易战的原因进行分析:美国对华贸易逆差过大;美方认为中方侵犯美国企业知识产权,中国的重商主义对美国经济产生了致命影响;转嫁国内矛盾,战略遏制中国。分析美国发动贸易战的危害,提出了中国应对挑战应妥善应对短期冲击,对等还击;拉动内需,加快自身经济结构调整等对策。