Bitcoin市场的长记忆性的实证分析

Bitcoin是一种新型的虚拟电子货币。运用初步的统计方法和R/S分析法分析其市场交易数据,对其长记忆性进行实证分析。分析结果表明,现阶段,Bitcoin的交易市场具有聚集性和持续性,当前的价格对于未来很长一段时间都有影响。     

试论国内区际贸易与对外贸易利益的关系

对外贸易的发展理应建立在国内区际贸易充分开展的基础上。国内区际贸易的开展对对外贸易利益的取得具有重要的意义。我国改革开放过程中的国内市场分割现象,使得国内区际贸易滞后于对外贸易快速发展,并制约了对外贸易利益最大化的实现。本文的政策结论是通过加快改革逐步实现国内经济市场化和一体化以提高外贸利益。     

我国引入股指期货交易的意义及可行性分析

到目前为止,我国股市仅有现货交易,却没有有效的风险回避机制,这必将影响到我国股市健康发展。因此,当前开发我国股指期货交易可以回避股市系统风险,增加市场流动性,促进股价合理波动,从而增强证券市场的竞争力。同时,在我国已经形成了较为完善的交易和监管体系,并拥有了相当规模的投资群体,开办股指期货的市场条件已具备。     

On the predictive power of ARJI volatility forecasts for Bitcoin

Motivated by the recent literature on cryptocurrency volatility dynamics, this paper adopts the ARJI, GARCH, EGARCH, and CGARCH models to explore their capabilities to make out-of-sample volatility forecasts for Bitcoin returns over a daily horizon from 2013 to 2018. The empirical results indicate that the ARJI jump model can cope with the extreme price movements of Bitcoin, showing comparatively superior in-sample goodness-of-fit, as well as out-of-sample predictive performance. However, due to the excessive volatility swings on the cryptocurrency market, the realized volatility of Bitcoin prices is only marginally explained by the GARCH genre of employed models.     

The influence of Taiwan’s stock market on Bitcoin’s price under Taiwan’s monetary policy threshold

ABSTRACT

This study uses a smooth transition autoregressive model with exogenous variables (STARX) to investigate whether there is a nonlinear relationship between Bitcoin and Taiwan’s stock market taking into account Taiwan’s monetary policy threshold during 2 February 2012 to 31 August 2019. The statistical results show there is a threshold effect and confirm a nonlinear relationship between Taiwan’s stock market and Bitcoin, with variations over time and across Bitcoin and Taiwan’s stock market. Specifically, we find that Bitcoin responds asymmetrically to Taiwan’s stock market according to the threshold value. Furthermore, the return on the closing price of TAIEX with a lag of two periods under Taiwan’s monetary policy threshold has a nonlinear impact on the return on the closing price of Bitcoin.     

美国贸易逆差:增长惯性与可持续性

美国的经常项目逆差特别是贸易逆差“历史悠久”,尤其是近年来高速增长,已引起人们广泛的关注。本文作者认为:20世纪90年代以来的美国贸易逆差已很难单从汇率、贸易政策及产品竞争力等单个变量来加以解释。通过运用滞后一年的时间数列相关分析及回归分析,本文得出的结论是:当期美国贸易逆差是前期美国贸易逆差的惯性增长,并且只要美国资本与金融账户的盈余足够冲抵贸易逆差,美国的贸易逆差便具有可持续性。针对近期美国人制造的“人民币升值论”,结合近十年来中美双边贸易现实,说明美国贸易逆差与人民币汇率之间没有必然联系,人民币升值也不可能改善美国的贸易收支状况。     

Modelling the dynamics of Bitcoin and Litecoin: GARCH versus stochastic volatility models

We examine and compare a large number of generalized autoregressive conditional heteroskedastic (GARCH) and stochastic volatility (SV) models using series of Bitcoin and Litecoin price returns to assess the model fit for dynamics of these cryptocurrency price returns series. The various models examined include the standard GARCH(1,1) and SV with an AR(1) log-volatility process, as well as more flexible models with jumps, volatility in mean, leverage effects, t-distributed and moving average innovations. We report that the best model for Bitcoin is SV-t while it is GARCH-t for Litecoin. Overall, the t-class of models performs better than other classes for both cryptocurrencies. For Bitcoin, the SV models consistently outperform the GARCH models and the same holds true for Litecoin in most cases. Finally, the comparison of GARCH models with GARCH-GJR models reveals that the leverage effect is not significant for cryptocurrencies, suggesting that these do not behave like stock prices.     

入世对我国证券市场发展的影响与对策

中国加入世贸组织是顺应经济全球化的趋势，迅速融入世界经济潮流的必然选择。入世后，我国的证券市场将会面临更大的挑战。为此，我们必须从我国的证券市场的实际出发，采取相应的措施，以适应证券对外开放的需要。     

Evaluation by the Aumann and Serrano performance index and Sharpe ratio: Bitcoin performance

We compare Bitcoin performance based on the Aumann and Serrano performance index and Sharpe ratio assuming that asset returns follow the class of discrete normal mixture distributions. The Aumann and Serrano performance index can take into account higher moments of the underlying distribution of assets and is relevant for risk-averse investors. We evaluate Bitcoin performance based on the Aumann and Serrano index relative to the performance of other assets. Our evaluation shows that Bitcoin is rated highly by the Sharpe ratio but rated very poorly by the Aumann and Serrano index. We also find some stock assets can beat Bitcoin by the Sharpe ratio when an investment horizon is monthly.     

Environmental Policy, Intra-Industry Trade and Transfrontier Pollution

The paper discusses effects of domestic environmental policy on foreignemissions and on transboundary pollution. We use a Dixit-Stiglitz typemodel of monopolistic competition with an endogenous number of firms.Production generates environmental externalities which spill over to theother country. It is shown that environmental policy has an impact onmarket structure at home and abroad. These market structure effectsinduce changes in emissions abroad. In contrast to what has been derivedin earlier contributions, it turns out to be possible that tighterenvironmental standards at home lead to less emissions abroad. The paperderives these results and provides the economic intuition behind them.Finally, conditions for optimal environmental policies are derived.     

Safe havens in the face of Presidential election uncertainty: A comparison between Bitcoin,oil and precious metals

Even though the empirical literature on safe haven properties of different assets with respect to financial risks is increasing, their abilities to safeguard against political risks has not been the subject of large empirical investigations. This paper uses an Empirical Mode Decomposition-based approach to look into the time-varying role of different assets (in particular, oil, precious metals and Bitcoin) as a safe haven against U.S. stocks in times of heightened uncertainty surrounding the outcome of the 2016 U.S. presidential election. Our results suggest that oil can act as an effective safe haven against political risk exposure; but such property varies over time. The abilities of gold and silver to provide positive returns during downturns have been also documented in the medium-and the long-term. Bitcoin also serves as a safe haven against U.S. stock losses but in the short-term. These findings provide useful and relevant information to investors to help ensure better asset allocation in an uncertain environment.     

The financial costs of political uncertainty: Evidence from the 2016 US presidential elections

The victory of Mr. Donald Trump came as a surprise to a wide range of market participants. Some of the elements of his economic plan were envisaged to affect all US sectors. This paper assesses the reactions of disaggregated US stock market to the 2016 US presidential election results, and possible deregulation that is to follow after his inauguration. We find that the different US sectors were significantly and varyingly influenced by the election result, and were greatly reactive during the days after the inauguration. This underscores that uncertainty tends to persist and even rises since the President-elect took office.     

贸易成本、要素流动与区域经济差异

本世纪以来,中国交通基础设施不断优化、物流业的迅猛发展以及国内市场化的不断加深对中国区域间要素流动、产业转移及区域经济差异的影响,成为具有重要理论与现实意义的问题。本文通过构建包含贸易成本的两地区-两部门新经济地理模型来研究这一问题,并在合理的参数条件下进行数值模拟。研究发现贸易成本的降低阻碍了劳动力、资本与可贸易产业从发达地区向欠发达地区的流动和转移,加大了地区间经济差异,从而为"迁移谜题"提供了新的解释角度。根据理论研究的结果,本文提出相关的政策建议。     

重庆市外贸竞争力的现状分析与对策建议

近年来,重庆市的经济外向度有所提高,但外资参与度低、出口产品在国际市场上的竞争力较弱的状况依然存在.重庆市是长江上游和我国西部地区的中心城市.在我国加入世贸组织、国内国际市场"无缝连接"进程不断加快的今天,重庆市要加快发展,就必须融入全球化进程,在开放经济中求发展,提高自身的外贸竞争力.     

Uncertainty assessment in socially responsible and Islamic stock markets in the short and long terms: an ARDL approach

This study measures financial uncertainty for two classes of alternative financial assets (Dow Jones Islamic and Dow Jones Sustainability Indexes) and the conventional US stock market (Dow Jones Industrial Index) for the period of 1999–2017, using an asymmetric exponential GARCH model. Using an ARDL model, we propose an intertemporal dynamic analysis of uncertainty for Islamic and socially responsible stock markets. Our findings show that, first, conventional and ethical investments present high comparable levels of uncertainty for which the dynamics is time-varying. Second, uncertainty in the conventional US stock market has a significant and positive effect on the uncertainty in alternative stock markets. Thus, uncertainty characterizes conventional and ethical stock markets both in the short and long terms. In particular, while the short-term uncertainty of ethical markets might be associated with their characteristics, the long-term aspect of uncertainty for ethical funds is rather associated with the effect of the conventional stock market environment. Although these findings show mean-reversion and uncertainty spillovers from the alternative stock markets to the conventional US one, they suggest lack of safety and certainty for investments in ethic markets, which remain fragile and closely dependent on the conventional market.     

Bitcoin price and its marginal cost of production: support for a fundamental value

This study back-tests a marginal cost of production model proposed to value the digital currency Bitcoin. Results from both conventional regression and vector autoregression (VAR) models show that the marginal cost of production plays an important role in explaining Bitcoin prices, challenging recent allegations that Bitcoins are essentially worthless. Even with markets pricing Bitcoin in the thousands of dollars each, the valuation model seems robust. The data show that a price bubble that began in the Fall of 2017 resolved itself in early 2018, converging with the marginal cost model. This suggests that while bubbles may appear in the Bitcoin market, prices will tend to this bound and not collapse to zero.     

关于我国证券市场的发展与监管问题

我国证券市场经过十余年的发展,取得了长足的进步。证券市场在经济发展中发挥着不可替代的作用,在国民经济中占据着重要地位。但是,我国证券市场也存在着历史遗留问题,改革方案设计不够科学及价值判断偏差等三类问题,主要表现在市场基础不够稳固,市场存在较大缺陷,证券监督有待加强,证券公司发展滞后。必须通过全面提高上市公司素质,完善市场运行机制,加强市场监管,推动券商的发展等措施来完善市场功能。     

Oil shocks,US economic uncertainty,and emerging stock markets

This paper investigates the impacts of oil price shocks and US economic uncertainty on emerging equity markets within a structural VAR model. I find that both precautionary oil demand and US economic uncertainty shocks have significant negative effects on emerging stock returns, whereas aggregate demand shocks cause a sustained rise of the returns. In particular, the direct effects of oil shocks on emerging stock returns are amplified by the endogenous response of US economic uncertainty. Variance decomposition analysis shows that oil market fundamentals and US economic uncertainty are an important determinant of emerging equity returns, accounting for 35% and 24% of their long-term variations, respectively. The heterogeneous impacts of structural shocks on individual emerging markets, however, suggest that a well-diversified portfolio can be obtainable.     

噪音交易影响中国股市效率的实证分析

适度的噪音能够增加市场的流动性，但噪音交易的过度存在会对股票市场的效率产生负面的影响。本文借用分形理论的R／S分析法，对中国股市的收益率进行了实证检验，计算其赫斯特（hurst）指数，并与美国和香港的赫斯特指数进行横向比较，以此来分析中国股市的有效性以及噪音交易的程度。     

Trade,tropical deforestation and policy interventions

Trade interventions are increasingly advocated as a means for controlling timber-related tropical deforestation. This paper analyzes the impact on deforestation of such policy instruments in a dynamic framework. The forest is modelled as a potentially renewable resource, and timber is extracted for purposes of export and domestic consumption. Optimality conditions for a variety of model specifications are derived, and the impacts of changes in the terms of trade and market structure on long-run deforestation are analyzed. The results of this analysis suggest that trade interventions that seek to affect the terms of trade against the export of tropical timber products are in the long run a second-best policy option for influencing the deforestation process.We would like to thank Joanne Burgess for contributing to discussions that resulted in this paper, which were held at the Beijer Institute of Ecological Economics of the Royal Swedish Academy of Sciences. We acknowledge the financial support given by the Beijer Institute and the hospitality of its staff, and in particular we are grateful to Prof. Karl-Göran Mäler for inviting us to use the facilities at Beijer and to Charles Perrings, Director of the Biodiversity Programme. Additional support for Edward Barbier's participation in the research was also provided by the International Tropical Timber Organization, under contract no. PCM(XI)/4, Economic Linkages Between the International Trade in Tropical Timber and the Sustainable Management of Tropical Forests. We are grateful to comments provided by two anonymous referees; however, the usual disclaimer applies.