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转型中的政策性银行金融债
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摘要
通过三十余年的渐进式改革,我国经济发展模式逐步从计划经济步入市场经济,但中国金融改革依然任重道远。政策性银行的成立具有独特的经济背景,随着发展环境的变化,其内生性改革动力亦不断增强。中央经济工作会议已明确提出,未来国家开发银行、中国进出口银行和中国农业发展银行要按照“一行一策”的原则逐步进行改革。政策性银行以发行金融债券为主要资金来源,目前政策性银行金融债券已成为我国债券市场规模第二大的券种,我国政策性银行金融债历来享有国家主权信用,其风险等级与国债相同。然而,随着政策性银行的改革转型,政策性银行发行债券的风险权重由享受国家主权信用的零风险权重即将转为商业机构的20%的风险权重,在转型期间,政策性银行金融债券的属性将表现出新的特点。收益率、波动性和流动性是金融资产共有的三大属性,分别体现了资产的收益性、安全性和变现能力。本文以政策性银行的转型为研究背景,以政策性银行金融债的收益和风险为出发点,全面系统地研究了其利率期限结构、市场风险、流动性风险和信用风险,并结合理论与实证研究的结果提出了相应的政策建议。
     本文旨在运用理论与实践相结合的分析框架与方法,引用经济学的其他分支以及数学的重要原理,同时在翔实数据的基础上运用计量方法对转型期的政策性银行金融债进行研究。在理论方面,回顾我国政策性银行及政策性银行金融债的发展历程,综述政策性银行金融债的研究文献,阐明政策性银行金融债与政策性银行的关系,探讨政策性银行金融债发行与交易的意义等。在实证方面,结合中国政策性银行的相关数据对政策性银行金融债的利率期限结构、市场风险、流动性风险、信用风险性逐一进行分析,进而研究政策性银行金融债满足政策性银行融资需求及商业银行调节资产配置需求的作用机制。
     文章采用主成份分析法提取出独立成分对利率期限结构进行替代,提取出了代表水平移动成分、斜率变动成分和曲线变动的三个主成份,发现政策性银行金融债收益率曲线水平因素影响非常大,而倾斜因素与曲度因素影响很小,表现出市场对政策性银行金融债的投资趋于理性,没有出现较多的债券集中炒作和过度投机。
     通过VAR-GARCH模型的经验分析表明,通货膨胀率越高,政策性银行金融债收益率越低。通货膨胀代表资金流动性充裕,商业银行基于资产调整效应、财富效应以及市场预期效应造成政策性银行金融债价格上涨,从而收益率降低。从紧的货币政策也将通过上述效应提高政策性银行金融债收益率。说明我国银行间债券市场的传导机制存在一定的连带性。Granger因果检验和脉冲响应结论表明央行的货币政策改变对政策性银行金融债收益率造成了影响,且通货膨胀的预期冲击具有持久性,投资者对央行货币政策持信任态度。
     本文使用聚类分析的方法对众多备选的流动性衡量指标进行降维,发现政策性银行金融债流动性总体呈现出平稳上升的态势,从2005年9月份开始,不仅流动性的波动性大大减小了,更呈现出平稳的上升趋势,特别是2007年以后,我国政策性银行的金融债的流动性有了很大的改善,同时发现交易的活跃程度和竞争程度与证券的流动性负相关,信息、风险与流动性正相关。
     结合我国金融债市场的具体情况,本文采用情景分析法模拟了政策性银行金融债的信用评级变化债券持有人和金融市场的影响,通过选取一组风险因素作为所需要的测试情景,分析测试对象在该情景下可能受到的最大损失。研究发现下调信用评级,对债券持有人的造成损失,调整幅度越大、期限越长对债券持有者造成的损失越大,还会加剧债券市场价格的波动,增加系统性风险。基于实证研究分析了计算了在不同风险权重下,银行间市场做市商的16家国内商业银行的资本充足率的变化,研究发现在核心资产不变的情况下,商业银行的资本充足率会下降,但是这种冲击造成的影响并不大,即使风险权重增加到最大值20%,16家银行依旧满足巴塞尔资本协议规定的商业银行资本充足率不得低于8%的要求。
Through30years'gradual reforming, our country has successfully changed from Planned Economy Model to Market Economy Model. But in terms of the development of financial market, there is still a long way to go. Policy banks born in a special economic background, whose endogenous power for marketization enhance continuously with the change of the development environment. The national financial work conference has indicated definitely that, China Development Bank, The Export-Import Bank of China, Agricultural Development Bank of China must push forward reform under the principle'One Bank, One Policy'. The main financing of Policy banks is achieved by issuing financial bond. The policy financial bond has been the second largest issuing in bond market, which has traditionally enjoyed a national credit guaranteed by the State and has the same level of risk with treasure bonds. However, with the commercialization reform of the State Development Bank, the risk weighted will increased from zero to20%, which is same with the commercial organizations. During the transition period, the attributes of policy financial bonds will bring out new features. The rate of return, volatility and liquidity are three attributes of financial assets which reflect the return, security and liquidity. In this paper, take the transformation of policy banks as the research background, we start at the return and risk of policy financial bonds, and study of the term structure, market risk, liquidity risk and credit risk systematically. Combined with theoretical and empirical results we put up with the corresponding policy recommendations.
     This article researched the return rate of policy financial bond, we researches the return rate curve and the term structure of interest rate using method of Principal Component Analysis(PCA) and GARCH model, and conclude that we can analyze the term structure of interest rate of policy financial bond with few principal component. The return volatility also has the character of clustering, just like the volatility of other interest rate products; with time series VAR model, Granger causality test and Impulse Response analysis methods, we researches the return rate of policy financial bond and the instrument of macroeconomic policy, we conclude that the policy change of central bank does have an impact on the return rate of policy financial bond, moreover, the shock of inflation expectation persists, investors trust the policy of central bank.
     This article researches the liquidity of policy bonds exchanged between banks. And analyze the basic liquidity problems of the policy financial bond of our country, then discuss the impacts on the liquidity of policy financial bonds through6aspects: trading system, trade cost, market transparency, trade category, market participant and macro factors. We summarize the measuring methods of bond liquidity, and calculate the liquidity of policy financial bonds of our country with effective methods. With the empirical research of the factors that impact the liquidity of policy financial bond of our country, we concluded that average trade volume, risk, residual maturity and the coupon rate of bond have significant impacts on the liquidity of our country, while trade volume have positive impacts, and information transparency and distribution volume have little impacts. Finally we proposed some actions to smooth the liquidity of policy financial bond of our country from4aspects:product innovation, distribution frequency, market maker and regular construction.
     The article also analyzes the factors that determine the credit risk of policy financial bonds of our country from three aspects:service quality of bank, supports from government and macroeconomic cycle, and conclude these decisive factors. Combing with the existing operation mechanism of Chinese policy banks, we analyzed how credit impact on holders, price and market risk of the policy financial bonds of our country, and how the risk weight of policy financial bank impacts the capital adequacy of commercial bank, our research indicates while the weight of bond increases, the capital adequacy of commercial banks decreases. At last we discusses the innovation and development of the policy financial bond, and analyzes the necessity and feasibility of policy financial bond innovation, and demonstrates from two aspects:exist problems and superiority of innovation. Then we analyze what we can learn from other countries that do well on policy bond.
引文
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