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GARCH option pricing and implied FX volatility indices GARCH期权定价与隐含外汇波动率指数
Q4 Economics, Econometrics and Finance Pub Date : 2021-01-02 DOI: 10.1080/03796205.2021.1956170
Pierre J. Venter, E. Maré
Abstract The focus of this paper is the foreign exchange (FX) variance risk premium and the modelling of FX volatility indices of both a developed (United States Dollar) and an emerging market (South African Rand). Regarding the methodology, the variance risk premium is estimated as the difference between realised variance and the variance obtained from the volatility index, and different univariate Generalised Autoregressive Conditional Heteroskedasticity (GARCH) models are considered for the modelling of the volatility index. Empirical results indicate that the variance risk premium is negative on average, this is consistent with previous findings in the literature. Furthermore, asymmetric GARCH models outperform the symmetric GARCH model when modelling FX implied volatility indices.
摘要本文的重点是发达国家(美元)和新兴市场(南非兰特)的外汇(FX)方差风险溢价以及外汇波动率指数的建模。关于该方法,方差风险溢价被估计为实现方差和从波动率指数获得的方差之间的差,并且不同的单变量广义自回归条件异方差(GARCH)模型被考虑用于波动率指数的建模。实证结果表明,方差风险溢价平均为负,这与文献中的研究结果一致。此外,在对外汇隐含波动率指数进行建模时,不对称GARCH模型优于对称GARCH模型。
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引用次数: 0
The differential effects of oil price shocks on exchange rate, inflation, and monetary policy rate in Ghana 石油价格冲击对加纳汇率、通货膨胀和货币政策利率的差异影响
Q4 Economics, Econometrics and Finance Pub Date : 2021-01-02 DOI: 10.1080/03796205.2021.1956168
Mikidadu Mohammed
Abstract This paper investigates the differential effects of oil price shocks on exchange rate, inflation, and monetary policy rate in Ghana. The paper also introduces the trade weighted U.S. dollar-major currencies index as another measure for identifying the speculative component of the real price of oil. To execute its objective, the paper employed a two-step estimation technique and monthly data from 1973 to 2018. The two-step method involves structural VAR in the first step and OLS regressions in the second step. Full sample estimation results indicate that oil price shocks are inconsequential to exchange rate, inflation, and monetary policy rate in Ghana. Furthermore, when the sample is split into two sub-periods, the study did not find the fact that Ghana switching from a net oil-importer to a net oil-exporter have any deferential effect. Taken together, the findings suggest that even in emerging and developing countries, a fading relationship between oil price shocks and macroeconomic indicators could exist.
摘要本文研究了加纳石油价格冲击对汇率、通货膨胀和货币政策利率的差异影响。本文还介绍了贸易加权美元主要货币指数,作为识别石油实际价格投机成分的另一种衡量标准。为了实现其目标,本文采用了两步估计技术和1973年至2018年的月度数据。两步法包括第一步的结构VAR和第二步的OLS回归。全样本估计结果表明,油价冲击与加纳的汇率、通货膨胀和货币政策利率无关。此外,当样本分为两个子时期时,研究没有发现加纳从石油净进口国转变为石油净出口国有任何不同的影响。综合来看,研究结果表明,即使在新兴国家和发展中国家,油价冲击与宏观经济指标之间的关系也可能减弱。
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引用次数: 2
The corporate income tax gap in South Africa: a top-down approach 南非企业所得税差距:自上而下的方法
Q4 Economics, Econometrics and Finance Pub Date : 2021-01-02 DOI: 10.1080/03796205.2021.1956167
A. Jansen, W. Steyn, Winile Ngobeni, Alexius Sithole
Abstract A key objective of many governments is to improve tax revenue mobilization. One way to achieve this is by improving tax compliance. This requires accurate knowledge of the tax gap, i.e., the difference between what should be paid and what is actually paid. Tax gaps have been primarily estimated in developed countries, and very little is known about tax gaps in developing countries. Information about these gaps can help policy makers develop appropriate revenue mobilization strategies. This paper uses a top-down approach to estimate the tax gap in corporate income tax in South Africa. It uses national accounts statistics and tax administrative data to estimate the gap in the non-financial corporate sector, i.e., the difference between potential and actual corporate income tax under current tax legislation. The overall gap is estimated at 39 per cent of the potential tax liability or 2 per cent of GDP over the period 2015 to 2017.
摘要许多政府的一个主要目标是改善税收动员。实现这一目标的一种方法是提高税收合规性。这需要准确了解税收差距,即应支付的税款和实际支付的税款之间的差异。主要对发达国家的税收差距进行了估计,对发展中国家的税收差距知之甚少。关于这些差距的信息可以帮助决策者制定适当的收入调动战略。本文采用自上而下的方法来估计南非企业所得税的税收差距。它利用国民账户统计数据和税务行政数据来估计非金融企业部门的差距,即现行税收立法下潜在和实际企业所得税之间的差异。2015年至2017年期间,总体差距估计为潜在纳税义务的39%或国内生产总值的2%。
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引用次数: 6
COMMODITY PRICE SHOCKS AND FINANCIAL SECTOR STABILITY IN COMMODITY DEPENDENT COUNTRIES IN SOUTHERN AFRICA 南部非洲依赖商品国家的商品价格冲击和金融部门稳定
Q4 Economics, Econometrics and Finance Pub Date : 2020-12-14 DOI: 10.1080/03796205.2020.1919427
N. Mupunga, T. Ngundu
Abstract This paper examines the impact of negative commodity price shocks on financial sector stability in selected Southern African countries, namely Angola, Botswana, Mozambique, Namibia, Tanzania, Zambia and Zimbabwe. Using multivariate panel data regression analysis, with fixed effects from 2000 to 2015, the study shows that commodity price downturns result in increased non-performing loans and reduced bank profitability. Specifically, negative commodity price shocks reduce profitability as measured by the return on assets and return on equity. In addition, the study shows that there is an adverse impact on financial sector conditions, using a financial condition index as a proxy. The index was derived from a combination of measures of non-performing loans, return on assets and regulatory capital adequacy ratios, using a three variable dynamic factor model. The main transmission mechanisms through which commodity prices shocks affect financial stability are GDP growth, fiscal revenue, savings and the size of the fiscal deficit.
摘要本文考察了商品价格负面冲击对南部非洲国家金融部门稳定性的影响,这些国家包括安哥拉、博茨瓦纳、莫桑比克、纳米比亚、坦桑尼亚、赞比亚和津巴布韦。采用多元面板数据回归分析,在2000 - 2015年的固定效应下,研究发现大宗商品价格下跌导致不良贷款增加,银行盈利能力下降。具体来说,负面的商品价格冲击降低了以资产收益率和股本收益率衡量的盈利能力。此外,研究表明,使用金融状况指数作为代理,金融部门状况受到不利影响。该指数采用三变量动态因素模型,综合衡量不良贷款、资产回报率和监管资本充足率。大宗商品价格冲击影响金融稳定的主要传导机制是GDP增长、财政收入、储蓄和财政赤字规模。
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引用次数: 4
WEAK LINKS AMONG RISK, RETURN AND VOLUME IN TIME AND FREQUENCY DOMAINS 时间域和频率域中风险、回报和交易量之间的薄弱环节
Q4 Economics, Econometrics and Finance Pub Date : 2020-12-14 DOI: 10.1080/03796205.2020.1919421
H. Dong, X. Guo
Abstract The classical portfolio theory suggests that higher returns of an asset are justified by the higher risk it carries, supported by multi-factor cross-sectional regressions. By investigating the time series and frequency transformation of the Russell 3000 constituents, this study shows that there are weak links between risk and return, as well as trade volume and return. Only 19,02% (13,45%) constituents have significantly positive (negative) risk and return relationships. In addition, only 7,66% (12,77%) of the returns are positively (negatively) related to trade volume. We use the cross-wavelet power spectrums to provide additional evidence on the weak links. The conclusions from cross-sectional analysis might lead to the asset misallocation in a time series setting.
摘要经典的投资组合理论认为,资产的高收益是由其所承担的高风险来证明的,并得到多因素横截面回归的支持。本文通过对罗素3000指数成分股的时间序列和频率变换进行研究,发现风险与收益、交易量与收益之间存在弱联系。只有1902%(13.45%)的成分具有显著的正(负)风险和回报关系。此外,只有7.66%(12.77%)的收益与交易量呈正相关(负相关)。我们使用交叉小波功率谱来提供关于弱环节的额外证据。横断面分析的结论可能会导致时间序列设置下的资产错配。
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引用次数: 0
DYNAMIC INTERDEPENDENCE BETWEEN CRUDE OIL PRICES AND FOREIGN EXCHANGE MARKET IN NIGERIA 尼日利亚原油价格与外汇市场的动态相互依存关系
Q4 Economics, Econometrics and Finance Pub Date : 2020-12-14 DOI: 10.1080/03796205.2020.1919418
K. Emenike
Abstract Modelling volatility interdependence between crude oil and foreign exchange markets returns provides useful insights into how information is transmitted from the crude oil market to the foreign exchange market and vice versa. This paper evaluates dynamic interdependence between crude oil and foreign exchange markets by applying Baba, Engle, Kraft and Kroner (1990) (BEKK) specifications to crude oil prices and Naira/USD exchange rates. Estimates from the BEKK-GARCH (1,1) model indicate evidence of unidirectional shock and volatility transmission from crude oil market to foreign exchange market in Nigeria. Evidence of unidirectional volatility transmission provides support for partial interdependence between the markets in Nigeria. This finding has important implications for financial risk management, foreign exchange market regulation and crude oil revenue management policy.
对原油市场和外汇市场收益之间的波动性相互依赖关系进行建模,为了解信息如何从原油市场传递到外汇市场以及反之亦然提供了有用的见解。本文通过将Baba, Engle, Kraft and Kroner (1990) (BEKK)规范应用于原油价格和奈拉/美元汇率来评估原油与外汇市场之间的动态相互依赖关系。BEKK-GARCH(1,1)模型的估计表明,尼日利亚原油市场到外汇市场存在单向冲击和波动传导的证据。单向波动传导的证据为尼日利亚市场之间的部分相互依存提供了支持。这一发现对金融风险管理、外汇市场监管和原油收益管理政策具有重要意义。
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引用次数: 1
IDENTIFYING THE DRIVERS OF TRADE FINANCE IN SOUTH AFRICA 确定南非贸易融资的驱动因素
Q4 Economics, Econometrics and Finance Pub Date : 2020-12-14 DOI: 10.1080/03796205.2020.1919428
S. Boshoff, G. V. Van Vuuren, W. Viviers
Abstract Trade finance (or bank intermediated trade finance) plays an integral role in facilitating trade across the globe: most studies assert that trade finance (TF) forms part of more than 80% of total global trade. Although TF has increased in importance for policy makers after the financial crises of 2008, most studies conducted over the last decade (2009 onward) focussed on the supply side of TF and how its reduction has hampered trade. By applying a robust least squares maximum likelihood estimation technique, and using bi-squares and median absolute deviation-centred (MADMED) scaling, this study investigates the international and domestic variables driving demand for TF for several listed South African companies. This study identified 12 instances of individually significant relationships between certain industries and the independent variable (both domestic and international financial and economic variables). It also found significant regression results for the retail industry at first differences and identified that macro-economic and financial variables (such as the US gross domestic product and the rand-British pound exchange rate) influenced the demand for retail TF. The sole significant domestic variable was South African bank asset-to-capital ratios, showing that both financial and economic factors are relevant in identifying TF demand drivers of South African companies.
摘要贸易融资(或银行中介的贸易融资)在促进全球贸易方面发挥着不可或缺的作用:大多数研究表明,贸易融资占全球贸易总额的80%以上。尽管2008年金融危机后,TF对政策制定者的重要性有所增加,但在过去十年(2009年以后)进行的大多数研究都集中在TF的供应方面,以及其减少如何阻碍贸易。通过应用稳健的最小二乘最大似然估计技术,并使用双平方和中值绝对偏差中心(MADMED)标度,本研究调查了推动几家南非上市公司对TF需求的国际和国内变量。这项研究确定了12个特定行业与自变量(国内和国际金融和经济变量)之间存在个别显著关系的例子。研究还发现,零售业在最初的差异中存在显著的回归结果,并确定宏观经济和金融变量(如美国国内生产总值和兰特-英镑汇率)影响零售TF的需求。唯一显著的国内变量是南非银行资产资本比,表明金融和经济因素在确定南非公司的TF需求驱动因素方面都是相关的。
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引用次数: 0
ANALYSIS OF THE DEPENDENCE STRUCTURE BETWEEN MINERALS PRICES AND THE RAND/USD EXCHANGE RATE USING COPULAS 用copula分析矿产价格与兰特/美元汇率的依赖结构
Q4 Economics, Econometrics and Finance Pub Date : 2020-12-14 DOI: 10.1080/03796205.2020.1919425
K. Malandala, J. Olaomi
Abstract Copula functions are flexible tools for modelling the dependence structure between variables. In this research, we extend the literature on currency-commodity relationship using copulas. We examine the dependence structure between gold, platinum mineral prices and RAND/USD exchange rate. ARMA (1, 1)-EGARCH (1, 1) and ARMA(1, 1)-APARCH (1, 1) models under different error terms including normal, student-t and skewed student-t were fitted to the returns of commodity prices and the exchange rate. Constants and time varying copulas were then employed to examine the commodity-currency dependence structure. The results show evidence of a positive, strong dependence between gold, platinum prices and the RAND/USD exchange rate. The analysis relies on Clayton, rotated Clayton, Student-t, Gumbel, rotated Gumbel, Plackett and Joe Clayton copulas and provide an indication of leverage effects. The results of the time varying Normal copula indicate that fluctuations in gold and platinum prices generate Rand/USD volatility.
摘要Copula函数是对变量之间的依赖结构进行建模的灵活工具。在本研究中,我们使用copula对货币商品关系的文献进行了扩展。我们考察了黄金、铂矿价格与兰德/美元汇率之间的依赖结构。在包括正态、student-t和偏斜student-t在内的不同误差项下,ARMA(1,1)-EGARCH(1,1)和ARMA(1,1)-APARCH(1,1。然后使用常数和时变copula来检验商品货币依赖结构。结果表明,黄金、铂金价格与兰德/美元汇率之间存在着积极、强烈的相关性。该分析依赖于克莱顿、旋转克莱顿、Student-t、甘贝尔、旋转甘贝尔、Plackett和Joe Clayton交配,并提供杠杆效应的指示。时变正态copula的结果表明,黄金和铂价格的波动会产生兰德/美元的波动。
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引用次数: 0
Income Concentration and Economic Growth in the Neoliberal Period (1980-2014) 新自由主义时期的收入集中与经济增长(1980-2014)
Q4 Economics, Econometrics and Finance Pub Date : 2020-08-01 DOI: 10.1080/10800379.2020.12097364
J. Vaca
Fiscal reforms, which were the result of neoliberal economic policies, have led many countries to higher levels of inequality since the 1980s. This paper shows that the impact of income concentration on economic growth is both positive and negative, depending on the degree of accumulation. A positive relationship is observed when the concentration is moderate, but, when it becomes extreme, its impact turns negative. This trend is reflected in an inverted U-shaped curve. Using a GMM model, for a sample of 31 countries, it is found that the curve undergoes a change of direction when the 99th percentile accounts for approximately 24-26% of the total national income (this turning point is lower for OECD countries [14%] than for non-OECD countries [28%]). Also, the slopes suggest that the negative effects are much greater (about twice) than the positive ones.
财政改革是新自由主义经济政策的结果,自20世纪80年代以来,导致许多国家的不平等程度上升。本文表明,收入集中度对经济增长的影响有正的也有负的,这取决于积累的程度。当浓度适中时,可以观察到正的关系,但当浓度变得极端时,其影响会变成负的。这一趋势反映在倒U形曲线上。使用GMM模型,对于31个国家的样本,发现当第99个百分位数约占国民总收入的24-26%时,曲线会发生方向变化(经合组织国家[14%]的转折点低于非经合组织国家[28%])。此外,斜率表明负面影响比正面影响大得多(大约两倍)。
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引用次数: 1
Using Dynamic Panel Data Modeling to Study Net FDI Inflows in MENA Countries 利用动态面板数据模型研究中东和北非国家的外国直接投资净流入
Q4 Economics, Econometrics and Finance Pub Date : 2020-08-01 DOI: 10.1080/10800379.2020.12097360
M. Abonazel, O. A. Shalaby
Foreign direct investment (FDI) plays a critical role in providing financial capital needs, technology transfer, and creating more jobs in the host country. It also helps economies to increase competitiveness and productivity, thereby increasing exports and enhancing opportunities for growth and development. Middle East and North Africa (MENA) countries are in desperate need of more FDI inflows to resolve their economic problems. This paper investigates the determinants of net FDI inflows to 23 countries in MENA region during the period from 1995 to 2017 by using static and dynamic panel data analysis. The results indicate that macro determinants, such as gross domestic product (GDP) growth rate, openness, the inflation rate, and public expenditure have a significant impact on net FDI inflows. In addition, we observe that rents from natural resource (oil), exchange rate, and total reserves of foreign exchange and monetary gold do not significantly influence FDI.
外国直接投资在东道国提供金融资本需求、技术转让和创造更多就业机会方面发挥着关键作用。它还帮助各经济体提高竞争力和生产力,从而增加出口,增加增长和发展的机会。中东和北非国家迫切需要更多的外国直接投资流入来解决其经济问题。本文采用静态和动态面板数据分析方法,研究了1995-2017年中东和北非地区23个国家FDI净流入的决定因素。结果表明,国内生产总值(GDP)增长率、开放度、通货膨胀率和公共支出等宏观决定因素对外国直接投资净流入有显著影响。此外,我们观察到,自然资源(石油)的租金、汇率、外汇和货币黄金的总储量对外国直接投资没有显著影响。
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引用次数: 10
期刊
Journal for Studies in Economics and Econometrics
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