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Trust in DeFi: An Empirical Study of the Decentralized Exchange DeFi中的信任:去中心化交换的实证研究
Jianlei Han, Shiyang Huang, Zhuo Zhong
We provide empirical evidence that the decentralized cryptocurrency exchange can help reach the decentralized consensus of cryptocurrency value. We focus on Binance (the largest centralized cryptocurrency exchange) and Uniswap (the largest decentralized cryptocurrency exchange), and show that investors on Binance and Uniswap trade in response to prices on the two exchanges. More importantly, we find that the size of Uniswap user base exerts an asymmetric impact on investors’ trading. When its size increases, Uniswap user base exerts a larger impact on investors’ trading on Binance towards the Uniswap price, compared to the opposite direction. With a quasi-exogenous shock on Uniswap user base, we establish the causal impact of Uniswap user base on trading. Our results suggest that Uniswap as a decentralized exchange can reflect the consensus of cryptocurrency value that investors believe in because of blockchain’s transparency and trustworthiness. Our findings imply that the decentralized infrastructure built on blockchain and smart contracts can provide an alternative solution to cases where a consensus underwritten by a credible central party is not feasible or too costly to obtain.
我们提供的经验证据表明,去中心化的加密货币交易所有助于达成去中心化的加密货币价值共识。我们关注的是Binance(最大的集中式加密货币交易所)和Uniswap(最大的去中心化加密货币交易所),并表明Binance和Uniswap的投资者是根据两家交易所的价格进行交易的。更重要的是,我们发现Uniswap用户群的规模对投资者的交易产生不对称的影响。当其规模增加时,Uniswap用户群对币安投资者对Uniswap价格的交易影响更大,而反之。通过对Uniswap用户群的准外生冲击,我们建立了Uniswap用户群对交易的因果影响。我们的研究结果表明,由于区块链的透明度和可信度,Uniswap作为一个去中心化的交易所可以反映投资者所相信的加密货币价值的共识。我们的研究结果表明,建立在区块链和智能合约上的去中心化基础设施可以为由可信的中央方担保的共识不可行或获得成本过高的情况提供替代解决方案。
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引用次数: 10
Decentralized Exchanges: The 'Wild West' of Cryptocurrency Trading 去中心化交易所:加密货币交易的“狂野西部”
Angelo Aspris, Sean Foley, Jiri Svec, Leqi Wang
Abstract Cryptocurrencies are traded on two types of exchanges – centralized and decentralized. Although trading in the largest cryptocurrencies primarily occurs on centralized exchanges, most newly issued tokens can only be exchanged using decentralized platforms. Volumes in these decentralized exchanges (including automated market makers) has recently increased exponentially. We examine the role of this new and unmonitored market, utilizing an extensive sample of tokens exclusively traded on decentralized platforms. We show significant differences in the listing and trading characteristics of these tokens relative to their centralized equivalents. A small selection of these tokens obtain listing on a centralized exchange during the sample period, which is accompanied by a significant increase in trading activity, consistent with market segmentation. A centralized listing results in a migration of volume away from decentralized platforms, revealing a strong preference by tokenholders for deeper and more liquid markets over the increased security and anonymity offered by decentralized exchanges.
加密货币在两种类型的交易所进行交易——集中式和分散式。虽然最大的加密货币的交易主要发生在集中的交易所,但大多数新发行的代币只能使用分散的平台进行交换。这些去中心化交易所(包括自动做市商)的交易量最近呈指数级增长。我们利用在去中心化平台上独家交易的大量代币样本,研究了这个新的、不受监管的市场的作用。我们显示了这些代币的上市和交易特征相对于其中心化等价物的显着差异。在样本期间,这些代币中的一小部分在集中交易所上市,这伴随着交易活动的显着增加,与市场细分一致。中心化上市导致交易量从去中心化平台转移,这表明代币持有者对更深入、更具流动性的市场的强烈偏好,而不是去中心化交易所提供的更高的安全性和匿名性。
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引用次数: 31
Contagion Effect in ASEAN-5 Currency Markets During COVID-19 新冠肺炎疫情期间东盟五国货币市场的传染效应
Nur Ain Shahrier, Chung Tin Fah
The aim of this study is to examine an existence of contagion in ASEAN-5 currency markets during COVID-19 period, the type of contagion whether it is pure contagion that happens in the short run only or fundamentals-based contagion in the long run and the country source of this contagion effect. The study starts by imposing structure to the regional exchange rates guided by variable lag Granger causality and variable lag Transfer Entropy, followed by co-integration and Error Correction Model (VECM) within the Structural VAR framework to capture the short run, long run and error correction term (ect) in currency market of ASEAN-5. The next empirical framework used is wavelet analysis specifically wavelet power spectrum and wavelet coherency to capture the multi scale time and frequency domain of currency market volatility and covariance respectively. The VECM findings show there exists long run cointegration in the ASEAN-5 currency markets during COVID-19 and any disequilibrium will be adjusted by Indonesian Rupiah, Malaysia Ringgit and Singapore Dollar at daily rate of adjustments of 6.58%, 1.47% and 2.45% respectively. The wavelet power spectrum provides evidence of short run and long run contagion effect in Indonesia, Malaysia and Singapore currency market, while Philippines and Thailand experience minimal contagion effect in the short run and heightened volatility in the long run for Thailand. No long run contagion effect for Philippines. The wavelet coherency shows contagion effect emanating from Indonesia Rupiah to its neighboring countries in the short and only to Thailand and Malaysia in the long run.
本研究的目的是检验2019冠状病毒病期间东盟五国货币市场是否存在传染,传染的类型是仅在短期内发生的纯粹传染还是长期内发生的基于基本面的传染,以及这种传染效应的国家来源。本研究首先在变滞后格兰杰因果关系和变滞后传递熵的指导下对区域汇率进行结构建构,然后在结构VAR框架下采用协整和误差修正模型(VECM)来捕捉东盟五国货币市场的短期、长期和误差修正期(ect)。下一个使用的经验框架是小波分析,特别是小波功率谱和小波相干性,分别捕捉货币市场波动和协方差的多尺度时域和频域。VECM的研究结果显示,在2019冠状病毒病期间,东盟五国货币市场存在长期协整,印尼盾、马来西亚林吉特和新加坡元将分别以6.58%、1.47%和2.45%的日调整率对任何不平衡进行调整。小波功率谱为印尼、马来西亚和新加坡货币市场的短期和长期传染效应提供了证据,而菲律宾和泰国的短期传染效应最小,而泰国的长期波动加剧。对菲律宾没有长期传染效应。小波相干性表明,短期内印尼盾对周边国家产生传染效应,长期仅对泰国和马来西亚产生传染效应。
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引用次数: 0
High-Frequency Connectedness between Bitcoin and Other Top-Traded Crypto Assets during the COVID-19 Crisis 在COVID-19危机期间,比特币与其他顶级加密资产之间的高频连通性
Paraskevi Katsiampa, L. Yarovaya, D. Zięba
In this paper, we analyse co-movements and correlations between Bitcoin and thirty-one of the most-tradable crypto assets using high-frequency data for the period from January 2019 to December 2020. We apply the Diagonal-BEKK model to data from the pre-COVID and COVID-19 periods, and identify significant changes in patterns of co-movements and correlations during the pandemic period. We also employ the Minimum Spanning Tree (MST) and Planar Maximally Filtered Graph (PMFG) methods to study the changes of the crypto asset network structure after the COVID-19 outbreak. While the influential role of Bitcoin in the digital asset ecosystem has been confirmed, our novel findings reveal that due to recent developments in the blockchain ecosystem, crypto assets that can be categorised as dApps and Protocols have become more attractive to investors than pure cryptocurrencies, with dApps exhibiting the highest average degree of correlations with all crypto assets in the sample during the COVID-19 pandemic period.
在本文中,我们使用2019年1月至2020年12月期间的高频数据分析了比特币与31种最可交易的加密资产之间的共同运动和相关性。我们将对角线- bekk模型应用于COVID-19前和COVID-19时期的数据,并确定了大流行期间共同运动模式和相关性的显著变化。我们还采用最小生成树(MST)和平面最大过滤图(PMFG)方法研究了COVID-19爆发后加密资产网络结构的变化。虽然比特币在数字资产生态系统中的影响力已经得到证实,但我们的新发现表明,由于区块链生态系统的最新发展,可归类为dApps和协议的加密资产对投资者的吸引力超过了纯粹的加密货币,在COVID-19大流行期间,dApps与样本中所有加密资产的平均相关性程度最高。
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引用次数: 43
Analyst Forecasts and Currency Markets 分析师预测和货币市场
Florian Mair
I examine the forecasting performance, directional accuracy, rationality and economic value of analyst forecasts and characteristics of investment portfolios built from these forecasts for 30 currency pairs from 2006 to 2020. My results show that analyst forecasts perform worse than forecasts based on a random walk and forward rates and that they are biased and do not provide significant economic value to investors. Forecasts from global systemically important banks do not differ from non-systemically important banks in terms of forecasting ability. Median forecasts may strongly deviate from market expectations, while analyst forecast dispersion is positively associated with future currency returns. Portfolios built from analyst forecasts tend to strongly underperform the dollar factor, value, carry and momentum portfolios and are spanned by them. My findings indicate that expected returns extracted from analyst forecasts are negatively related to realized excess returns in FX markets and thus contribute to the literature on survey-based returns in asset pricing.
本文考察了2006年至2020年30种货币对的预测表现、方向准确性、合理性和经济价值,以及基于这些预测建立的投资组合的特征。我的研究结果表明,分析师的预测比基于随机游走和远期利率的预测表现得更差,而且它们是有偏见的,不能为投资者提供显著的经济价值。全球系统重要性银行的预测在预测能力方面与非系统重要性银行没有区别。预测中值可能严重偏离市场预期,而分析师预测差异与未来货币回报呈正相关。根据分析师预测建立的投资组合往往表现远逊于美元因素、价值、套利和动量投资组合,并被它们所跨越。我的研究结果表明,从分析师预测中提取的预期回报与外汇市场中实现的超额回报呈负相关,从而有助于资产定价中基于调查的回报的文献。
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引用次数: 0
From Forecast to Decisions in Graphical Models: A Natural Gradient Optimization Approach 从预测到图形模型中的决策:自然梯度优化方法
E. Benhamou, D. Saltiel, B. Guez, J. Atif, R. Laraki
Graphical models and in particular Hidden Markov Models or their continuous space equivalent, the so called Kalman filter model, are a powerful tool to make some inference that can be used in decision making contexts. The estimation of their parameters is usually based on the Expectation Maximization approach as this is a natural statistical way to train them. When used for decision making, it may be more relevant to find parameters that are relevant to our decisions rather than just try to fit the model from a statistical point of view. Hence, we can reformulate the determination of graphical model as an inference problem where the true concern is the quality of the decisions from the forecast given by the model. We show that the resulting optimization problem can be reformulated as an information geometric optimization problem and introduce a natural gradient descent strategy that incorporates additional meta parameters. We show that our approach is a strong alternative to the celebrated EM approach for learning in graphical models. Actually, our natural gradient based strategy leads to learning optimal parameters for the final objective function (which is our decision) without artificially trying to fit a distribution that may not correspond to the real one. We support our theoretical findings with the question of decision in financial markets and show that the learned model performs better than traditional practitioner methods and is less prone to overfitting.
图形模型,特别是隐马尔可夫模型或其连续空间等效模型,即所谓的卡尔曼滤波模型,是一种强大的工具,可以在决策环境中进行一些推断。它们参数的估计通常基于期望最大化方法,因为这是训练它们的自然统计方法。当用于决策时,找到与我们的决策相关的参数可能比仅仅从统计的角度尝试拟合模型更相关。因此,我们可以将图形模型的确定重新表述为一个推理问题,其中真正关心的是模型给出的预测决策的质量。我们表明,由此产生的优化问题可以重新表述为信息几何优化问题,并引入包含附加元参数的自然梯度下降策略。我们表明,我们的方法是一个强大的替代著名的EM方法在图形模型中学习。实际上,我们基于自然梯度的策略导致我们学习最终目标函数的最优参数(这是我们的决定),而不需要人为地尝试拟合可能与真实分布不对应的分布。我们用金融市场决策问题来支持我们的理论发现,并表明学习模型比传统的实践方法表现得更好,并且不容易过度拟合。
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引用次数: 2
Decentralized Finance (DeFi): An Emergent Alternative Financial Architecture 去中心化金融(DeFi):一种新兴的替代金融架构
Usman W. Chohan
Decentralized Finance (DeFi) offers the promise of an emergent alternative financial architecture that prioritizes disintermediation and decentralization to empower individuals along cryptoanarchist principles. Yet it is mired in considerable difficulties including market manipulation, distortionary incentives, excess short-termism, Ponzi-schemes, and money-laundering challenges that also foment a considerable level of dissuasion against DeFi’s wider adoption. This paper critically evaluates many of these important facets at a time when DeFi is emerging as a disintermediated and experimental financial praxis.
去中心化金融(DeFi)提供了一种新兴的替代金融架构的承诺,它优先考虑非中介化和去中心化,以根据加密无政府主义原则赋予个人权力。然而,它陷入了相当大的困难,包括市场操纵、扭曲性激励、过度的短期主义、庞氏骗局和洗钱挑战,这些也在很大程度上阻碍了对DeFi的广泛采用。本文在DeFi作为一种非中介和实验性金融实践出现的时候,批判性地评估了许多这些重要方面。
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引用次数: 26
Value-At-Risk Based Approach For Currency Hedging 基于风险价值的货币对冲方法
Rachna Khurana, Umang Khetan
Corporate FX risk management has gained complexity with an increased number of currencies involved and varying correlations among them. Existing literature has highlighted the need to account for cross-currency correlations when optimizing hedge ratios for portfolio management (Dowd, 1999). In this paper, we propose a Value-at-Risk (VaR) based model to estimate the optimal hedge ratio for a multi-national corporate that aims to minimize the cost of hedging at a given tolerance level of expected loss arising out of FX movement. The paper illustrates both parametric and historical methods of VaR estimation at a portfolio level as the first step in risk management. As a second step, an efficient-frontier is derived based on the expected VaR level at various hedge ratios and compared with associated hedge cost. The benefits of this approach include: identification of net exposures after correlations among currencies are accounted for in order to avoid duplication of hedges, and condensation of the parameters governing hedging decision into a single, intuitively-appealing number. The paper also highlights the need to frequently update the model’s assumptions as currency correlations and corporate exposures remain dynamic.   JEL Classification Codes: C10, F31, G32, M20.
随着涉及的货币数量的增加以及它们之间不同的相关性,企业外汇风险管理变得越来越复杂。现有文献强调,在优化投资组合管理的对冲比率时,需要考虑跨货币相关性(Dowd, 1999)。在本文中,我们提出了一个基于风险价值(VaR)的模型来估计跨国公司的最佳对冲比率,该比率旨在在给定的外汇波动预期损失容忍水平下最小化对冲成本。本文阐述了作为风险管理第一步的投资组合水平VaR估计的参数方法和历史方法。第二步,根据不同套期比率下的预期VaR水平推导出有效边界,并与相关的套期成本进行比较。这种方法的好处包括:在考虑了货币之间的相关性后,确定净风险敞口,以避免重复对冲,并将管理对冲决策的参数浓缩为一个直观吸引人的数字。这篇论文还强调了经常更新模型假设的必要性,因为货币相关性和企业风险敞口仍然是动态的。JEL分类代码:C10、F31、G32、M20。
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引用次数: 0
Are Global Exchange Traded Fund Pretentious on Exchange Rate Fluctuation? A Study Using GARCH Model 全球交易所交易基金对汇率波动矫情吗?GARCH模型的研究
Pub Date : 2020-12-17 DOI: 10.21511/imfi.17(4).2020.30
Geeta E, Iqbal Thonse Hawaldar, V. BAI G., Mendon Suhan, Rajesha T.M.
Investors invest in a foreign market to reap the benefits of currency differences. The change in the value of underlying assets affects these hedged funds and, at the same time, restricts investors from higher return possible in unhedged funds. This study aims to examine the performance of most actively traded shares in Exchange Traded Fund and any influence, along with tracking the information from the index. This study also analyzes the currency fluctuation and its impact on returns and volatility of ETF and index. The equity ETF, which tracks NASDAQ (NDX 100), is chosen for the study, and the data analysis is carried out using statistical methods such as correlation, regression, and GARCH model. The study utilizes the currency rate data from 2013 to 2018 of USD, GBP, and INR and examines its effect on the NDX (NASDAQ). The study emphasizes whether the ETF as a basket of securities is insensitive to currency rate fluctuations. It is found that the response of ETF to the currency movements is likely due to its underlying index. The study concludes that Motilal Oswal shares in NASDAQ 100 ETF are highly sensitive to the NDX 100 movements; thus, there is no direct impact between ETF and index performance through exchange rate fluctuation.
投资者投资外国市场是为了从货币差异中获利。标的资产价值的变化影响了这些对冲基金,同时也限制了投资者在非对冲基金中获得更高回报的可能。本研究旨在考察交易所交易基金中交易最活跃的股票的表现及其影响,并跟踪指数信息。本文还分析了货币波动对ETF和指数收益和波动率的影响。选择追踪纳斯达克指数(NDX 100)的股票型ETF作为研究对象,采用相关、回归、GARCH模型等统计方法对数据进行分析。该研究利用2013年至2018年的美元、英镑和印度卢比汇率数据,并检验其对NDX(纳斯达克)的影响。研究强调ETF作为一篮子证券是否对汇率波动不敏感。研究发现,ETF对货币变动的反应可能是由其基础指数决定的。研究得出结论:纳斯达克100指数ETF中Motilal Oswal股票对NDX 100指数变动高度敏感;因此,ETF与指数绩效之间不存在通过汇率波动的直接影响。
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引用次数: 2
Volatility Transmission and Volatility Impulse Response Functions in the Main and the Satellite Renminbi Exchange Rate Markets 人民币汇率主市场与卫星市场的波动传导与波动脉冲响应函数
M. Funke, Julius Loermann, Andrew Tsang
We analyse volatility spillovers between the on- and offshore (CNY and CNH) Renminbi exchange rates towards the US dollar (USD). The volatility impulse response (VIRF) methodology introduced by Hafner and Herwatz (2006) is applied to several shocks between January 2012 and December 2019. Furthermore, we propose a novel way of estimating VIRFs based on Bayesian estimation of the MV-GARCH BEKK model. A simple Independence Chain Metropolis-Hastings algorithm allows drawing VIRFs in an efficient manner, allowing to analyse the significance and persistence of volatility shocks and associated volatility spillovers. The VIRF results show that the CNH exchange rate promptly reflects the global market demand and supply, while the CNY exchange rate reacts with a time lag. The VIRF results also show the existence of spillovers between the two markets as the co-volatility increases in response to shocks.
我们分析了在岸和离岸(CNY和CNH)人民币汇率对美元(USD)的波动溢出效应。Hafner和Herwatz(2006)引入的波动率脉冲响应(VIRF)方法应用于2012年1月至2019年12月之间的几次冲击。此外,我们提出了一种基于MV-GARCH BEKK模型贝叶斯估计的virf估计方法。一个简单的独立链Metropolis-Hastings算法允许以有效的方式绘制virf,允许分析波动性冲击的重要性和持久性以及相关的波动性溢出。VIRF结果表明,CNH汇率迅速反映了全球市场的需求和供给,而CNY汇率则有一个时滞反应。VIRF的结果还表明,随着共同波动率在应对冲击时增加,两个市场之间存在溢出效应。
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引用次数: 2
期刊
Econometric Modeling: International Financial Markets - Foreign Exchange eJournal
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