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国债融资风险模拟、测度与预警研究
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摘要
财政政策是政府宏观经济调控的重要手段之一,在现代经济社会中具有举足轻重的地位。国债融资是财政收入的重要来源,在弥补财政赤字、筹集建设资金、保障民生需求等方面起到关键作用。政府国债融资决策是否科学、及时、有效直接影响融资成本的高低、融资风险的大小、国家财政金融体系的安全,甚至会引发局部乃至全球性的债务危机。
     如何权衡国债融资利息支付成本和成本变动风险之间的关系,特别是识别和测度国债融资成本变动风险,已经成为当前国债融资决策的难点和核心问题。风险识别、模拟与测度是本研究解决当前国债融资难点和核心问题的新思路和新方法,为此创新性工作有:(1)利用数量方法构建国债融资风险环境。市场风险方面,通过模拟方法模拟宏观经济状态变化,计算经济扩张和收缩概率;利率风险方面,通过随机过程模型揭示利率变化的数量特征,模拟国债融资的利率期限结构动态轨迹:(2)通过计算机模拟技术对影响政府国债融资成本的风险因素进行动态化模拟,在模拟样本下建立国债融资最优期限组合决策模型,求解政府可承受风险下融资成本最小化的融资方案;(3)应用非参数分布估计方法估计各融资方案的成本分布,并基于非参数分布估计提出二分算法测度未知分布风险事件发生概率,通过该方法定量测算各融资方案的成本风险特征,以此进行比较评估和压力测试,最终实现成本风险框架下政府国债期限组合的最优决策。
     如果将成本风险框架下的政府国债期限组合决策看作国债融资的中间环节,那么何时发行国债和何时偿还国债则是国债融资有始有终的关键问题。本研究对政府国债融资动机、经济功能和作用机制进行剖析探讨,从经济学角度创新性提出国债发行时机的经济学判断标准和国债偿还的成本收益评价方法。
     国债融资完成后,如何防范国债违约风险、提前化解债务危机是国债管理中必须考虑的重要问题。本研究提出将风险概率应用到国债风险预警中的新思路,首次通过测度风险指标超越警戒线的概率定量监测并识别国债违约风险。通过自行编程开发将风险概率预警方法转化为风险警示灯系统,通过设置灯号颜色直观表现国债总体风险和各项风险。
     本研究利用数量模型、经济学方法、计算机编程、统计概率测算和非参数估计方法等,分别在国债发行时间、期限组合、偿还时间、国债预警等方面进行了方法创新研究,突出了国债研究的多学科、定量化、可实现的研究特色,为我国政府制定国债发行策略和偿还策略、优化国债融资决策、进行国债风险管理,甚至是建立国债政策实验室提供了方法性依据和可行性参考。
Goverment debt, as the tool of government's economic management, plays an important role in modern economic activities. Debt is an important source of government income, which makes up fiscal deficits, raise funds for construction and ensure people's needs. It connects with the financing costs, risks and national finance security whether government financing is scientific, timely and reasonable. The key point of government financing decision-making is to reduce the cost of interest payments, control cost risk and prevent the debt crisis. The difficulty in debt financing is that government can not have both low costs and low risks. The portfolios with lower interest costs are often faced with large uncertainty. The portfolios with small risk often have high interest payments. How can the government make a trade-off between cost and risk, to set up scientific and reasonable financing portfolios, is a significant problem to be solved.
     Risk simulaton and risk measures are new ideas to deal with the trade-off between costs and risk. The reason why risk problems are boring is we usally cannot identify sources of risk and measure the risk. To resolve the problem, this study use mathematical model to make risk environment of government financing, simulate changes of risk factors by computer technology, proposed the numerical method to measure risk probability with non-parametric distribution estimation. First, we design a risk simulation system. Markov Chain Monte Carlo is used to simulate macroeconomic state changes. In this process, we calculate the probability of economic expansion and contraction. Stochastic model is used to simulate dynamic of term structure of interest rate. Second, we propose numerical methods to measure risk of costs and assesement to target portofolios. Based on simulation samples, we set an optimaziton model to look for the best portfolios that minimize costs under risk tolerance of government. Non-parametric statistics is used to estimate the distribution of simulation samples. Then, a new numerical method to measure risk is to be propesed. This technology can establish characteristics of cost-risk under any financing portfolios. It also can be applicated in comparative analysis of the various financing portofolios and stress testing.
     Government debt financing, as a public service, has beginnings and ends. If debt portpolios make-desition is the middle part, the issue of debt is beginnings and the payment of debt is ends. With the perspective of economics, we analyzed motivation of government debt issuing, study the economic function and mechanism of government financing, proposed the criteria for judging the issurance time, present a cost-benefit method of judging payment time. Against default risk, this study provides a new idea of early warning of risk probability. We measure the probability that risk indicators exceeded the warning level to monitor debt risk, set warning signals to visually show performance of the overall or part risk of debt.
     This study is a new try for government to use mathematics and computer technology to improve debt management. We present the methods of risk simulation, risk measurement, risk warning in government financing make-decision, highlighting multi-disciplinary, quantitative characteristics and operation. Of course, any model or method is only support tool for decision, not replace practical experience and judgments of debt manager. We hope this study can be helpful to establishment of the Chinnese debt policy laboratory in the coming future.
引文
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