企业数字技术应用的减污降碳协同效应研究

依据2010—2022年中国沪深A股上市公司面板数据,运用双向固定效应模型,考量数字技术应用的减污降碳协同效应及首席数据官调节作用。结果显示：企业数字技术应用通过提升绿色技术创新和改善ESG绩效,降低污染物排放及碳排放效应显著,设立首席数据官强化了这一效应;异质性检验显示,减污降碳协同效应在中小规模企业、非重污染行业以及东部地区企业更为显著。鉴于此,建议强化企业ESG绩效考核,进一步加大数字技术应用力度,鼓励绿色技术创新。     

A set-valued Markov chain approach to credit default

We propose a novel credit default model that takes into account the impact of macroeconomic factors and intergroup contagion on the defaults of obligors. We use a set-valued Markov chain to model the default process, which includes all defaulted obligors in the group. We obtain analytic characterizations for the default process and derive pricing formulas in explicit forms for synthetic collateralized debt obligations (CDOs). Furthermore, we use market data to calibrate the model and conduct numerical studies on the tranche spreads of CDOs. We find evidence to support that systematic default risk coupled with default contagion could have the leading component of the total default risk.     

Pricing a CDO on stochastically correlated underlyings

In this paper, we propose a method to price collateralized debt obligations (CDO) within Merton's structural model on underlyings with a stochastic mean-reverting covariance dependence. There are two key elements in our development, first we reduce dimensionality and complexity using principal component analysis on the assets' covariance matrix. Second, we approximate this continuous multidimensional structure using a tree method. Trinomial-tree models can be developed for both the principal components and the eigenvalues assuming the eigenvectors are constant over time and the eigenvalues are stochastic. Our method allows us to compute the joint default probabilities for k defaults of stochastically correlated underlyings and the value of CDOs in a fast manner, without having lost much accuracy. Furthermore we provide a method based on moments to estimate the parameters of the model.     

Copula dynamics in CDOs

Values of tranche spreads of collateralized debt obligations (CDOs) are driven by the joint default performance of the assets in the collateral pool. The dependence between the entities in the portfolio mainly depends on current economic conditions. Therefore, a correlation implied from tranches can be seen as a measure of the general situation of the credit market. We analyse the European market of standardized CDOs using tranches of the iTraxx index in the periods before and during the global financial crisis. We investigate the evolution of the correlations using different copula models: the standard Gaussian, the NIG, the double-t, and the Gumbel copula model. After calibration of these models, one obtains a time varying vector of parameters. We analyse the dynamic pattern of these coefficients. That enables us to forecast future parameters and consequently calculate Value-at-Risk measures for iTraxx Europe tranches.     

Stein’s method and zero bias transformation for CDO tranche pricing

We propose an original approximation method, which is based on Stein’s method and the zero bias transformation, to calculate CDO tranches in a general factor framework. We establish first-order correction terms for the Gaussian and the Poisson approximations respectively and we estimate the approximation errors. The application to the CDO pricing consists of combining the two approximations. This work is partially supported by Fondation de risque.     

美国资产支持证券市场结构与次按危机解析

美国次按危机不仅给世界多家金融巨擎造成巨大损失,甚至险些在世界范围内酿成了一场全面的流动性危机。文章从信贷资产证券化发起机构、CDO发起流程、信用评级的制定及下调原理,流动性危机的成因这一逻辑顺序全面回顾了美国资产支持证券市场的运作机制以及次贷危机产生的根源,以期为深入研究次级债问题提供参考。     

The new monetary and financial initiatives: Finance regaining its position as servant of the economy

Alternative financial and monetary innovations constantly multiply. Following major financial crises, propositions abound in an attempt to build new monetary and financial tools that break with conventional approaches; the aim is to “do differently.” Rather than official institutions, it is the general public – through the creation of communities – that takes charge of the issue, and thus initiatives fall within a bottom-up approach. But even more striking than the fact that this phenomenon is driven by economic actors is that all these initiatives – these financial innovations – reveal and even embody a real challenge to the conventional financial system, and directly criticize its functioning. Indeed, all are carriers of messages, values, etc. Curiously, most of the critics do stress the reality of finance and rehabilitate it in its economic and social role: that of being the servant of the economy.     

浅探公允价值对金融泡沫破灭的催化作用

公允价值的应用对金融危机的发生虽然没有起到实质性的作用,但对于金融泡沫的破灭有着不可忽略的加速作用,主要表现在房地产市场价格下降时,加速了房地产价格恶化有关金融资产价格的下降速度,影响了消费能力与信心.     

信用衍生品CDO对金融市场稳定性的影响研究

文章主要研究欧洲信用衍生产品CDO(Collateralized Debt Obligation,担保债务凭证)的发行对金融市场稳定性的影响.文章对CDO的发行量、市场波动率及欧洲6月期无风险利率与金融市场稳定性的关系采用联合极值的方法,建立泊松计数模型,并做实证分析,结果显示:金融中介之间的联动效应会增加金融市场的系统性风险;CDO发行量仅与负的联合极值显著正相关,表明CDO发行量越大对金融稳定性冲击越大.CDO发行量与正的联合极值不相关,说明CDO对银行进行风险管理的积极作用有限.此外,信息不对称程度及无风险利率也会对金融市场的稳定性产生影响.