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汇率与油价波动对企业价值的影响研究
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摘要
企业价值评估是现代财务管理的重要工具之一。通过对企业未来价值创造结果的度量,可以判断企业的整体价值,从而为分析和衡量企业的公平市场价值提供有关信息,帮助投资人和企业管理层以及政府监管机构改善决策。随着近年来企业并购重组、联营合资、股权转让、资产置换、破产清算等交易活动的蓬勃开展,对企业价值进行合理的科学评估,在投融资活动中逐步显现出其重要性。
     企业市场价值的变化除了决定于企业的核心价值,还受到外界经济环境、股权分配改革、宏观经济政策等因素的影响。随着全球经济一体化的发展和新的世界贸易格局的形成,中国企业,尤其是上市公司将越来越明显地受到汇率变动以及国际能源价格变动的影响。因此,要合理评估企业的价值,就不能对汇率与国际原油价格的波动视而不见。
     在详细分析汇率和国际油价波动影响企业价值的机理后,为了进一步地明确企业价值与宏观经济要素之间的关系,本文在首先利用剩余收益比例模型估算得到企业价值的估计值,接着将估计值与实际有效汇率和国际油价的波动进行协整分析,并构建误差修正模型,分析三者变化的联动关系。
     实证部分选取沪深证券市场810家2000年底前上市的上市公司为研究对象,对其企业价值进行估算,并通过编制企业价值指数与价格指数,验证了在全样本和分行业条件下,企业实际价值与市场价格波动之间的确存在内在联系。协整分析结果表明,企业价值与国际原油价格及实际有效汇率之间的确存在长期相互关系。最后的Granger检验结果表明,在5%的显著性水平下,人民币实际汇率与国际油价均为企业价值指数的Granger原因,但是反向假设不成立。企业价值与人民币实际有效汇率以及国际油价之间存在长期均衡关系的结果说明,企业尤其是上市公司的经营绩效,长期必然受到实际有效汇率价格波动和国际原油价格波动的影响。此外,人民币兑美元的实际汇率以及国际原油价格是制造业、信息技术业、金融保险业、社会服务业等相关行业的Granger原因。
     在判定企业价值、国际原油价格和汇率波动三者之间存在本质的长期相互关系之后,本文进一步将3种经济变量视为影响企业市场价值即股价的影响因素,深入挖掘企业价值、汇率、国际油价波动与上市公司股价走势之间的内在联系。实证研究运用Vapnik提出的支持向量机方法(Support Vector Machines, SVM),将企业价值视为股价变动的直接因素,汇率及国际能源价格视为间接因素,共同作为支持向量机模型的输入变量,构建上市公司股价的非线性预测模型,并取得显著优于随机游走模型和传统时序ARMA模型的预测效果,具有较好的预测性能。进一步的,剔除汇率和国际油价变量,仅将企业价值作为SVM的输入变量,构建单因素模型,实证表明其预测误差远远高于前述的多因素模型,由此判定,汇率和国际油价是影响企业市场价值即股价的重要因素。
     基于汇率与国际原油价格波动的企业价值研究,运用统计方法和计量分析工具,有效挖掘企业价值与国际油价及汇率波动之间的本质关系,并进一步构建SVM非线性预测模型,对上市公司股价进行合理估计,这不仅在理论上填充了国内在该研究领域的空白,在现实意义上为提高政府对宏观经济系统的有效监管和政策制定的正确性、企业的经营运行和管理目标的确定以及投资者制定正确的投资策略,也有着较重要的指导意义。
Enterprise valve evaluating is one of the most important tools for modern financial management. The whole enterprise value, which can be evaluated by measuring all of the future profit of the enterprise, provide useful information for analysing and measuring the intrinsic value of the company and support better decision-making for investors and governors. In recent years, many business activities, such as strategic reorganization and incorporation, joint venture or pool capital, transfer of share right, replacement of assets, bankruptcy and liquidation and so on, have been launched so frequently that it's very important to evaluate enterprises value correctly in the activities of investment and financing.
     The change of market value is not only decided by the enterprise core value, but also influenced by the economic environment outside, the equity division reforming, the macroeconomic policies, and so on. With the development of economic globalization and the formation of the new world trade pattern, the Chinese enterprises, especially the listed companies, have been influenced by the exchange rate fluctuation and the international oil price change more and more obviously. Hence, in order to get a true value of enterprises, the fluctuation of exchange rate and international oil price should never be neglected.
     In order to clear the relationship between enterprise value and the macroeconomic factors further, after expounding the exchange rate and international oil price fluctuation risk faced by the enterprises and the polices have been promoted to reduce the losses in detail, this paper uses Residual income proportion model to estimate the enterprise value firstly, then puts up Johansen co-integration method on the analysis of estimate value and the fluctuation of the real effective exchange rate and international oil prices, moreover, builds the Error Correction Model, analyzes the co-movement of the three ones.
     The empirical research of this paper selects810listed companies, all of which have been listed before the end of2000, as the study object. Then estimate their actual enterprise value and compiles value index and price index. The results of empirical research show that there is true interconnection between the actual enterprise value and the fluctuations of market price of listed companies based on both bulk sample and sub-industry sample. Co-integration analysis shows that there are long-term relationship between enterprise value and the international oil prices and the real effective exchange rate. Lastly, Granger Causality Tests shows that the international oil price and the exchange rate are both the Granger reason of enterprise value index under the5%confidence level, while the reverse is not true. The long-term equilibrium relationship between the enterprise value of listed companies and the real effective exchange rate and the international oil prices reveals that the value of enterprises, especially the listed companies, could be suffered from the exchange rate and international oil price fluctuation in the long run. Besides, the international oil price and the exchange rate is the Granger reason of some relevant industries, such as manufacturing industry, information technology industry, finance and insurance industry, social services industry and so on.
     After judging whether there is a long-run equilibrium relationship between the three variables, this paper treats the three economic variables as the factors influence the listed companies' stock price, then digging the intrinsical relationship between the three variables and share price movements of the listed companies. Empirical research applies the Support Vector Machines (SVM), promoted by Vapnik, on predicting. In the predicting model, enterprise value is treated as a direct factor of stock price changes, while exchange rates and international energy prices are teated as indirect factors. They are both selected as the input variables in supporting the SVM model. Then we build listed company's share price nonlinear forecasting model, which has good prediction performance, achieves significantly better prediction consequent than the random walk model and traditional time series ARMA model. Furthermore, this paper leaving out variables of exchange rate and international oil fluctuation, only enterprise value is chosen as input variable to build a single-factor model. Empirical research suggests that predicting performance of the single-factor model is worse than multi-factor model. So, we conclude that the exchange rate and international oil fluctuation are important variables for enterprises'marketing value.
     Applying the statistics methods and metrology analysis tools in the analysis of enterprise value and the study of the stock price prediction based on the fluctuation of exchange rate and international oil price, effectively mining the essential relationship between the enterprise value and the fluctuation of international oil prices and exchange rate. And moreover, the SVM nonlinear model has been promoted for listed companies' stock price forecasting. This paper not only enriches the vacancy of related researches theoretically, but also provides precious suggestions for government's supervision, the companies'running and the determination of management objectives, the investors' investing decision making and so on in reality.
引文
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