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Estimating Value at Risk and Expected Shortfall: A Kalman Filter Approach 估算风险价值和预期亏损:卡尔曼滤波法
Pub Date : 2024-01-20 DOI: 10.32479/ijefi.15184
Max van der Lecq, G. Vuuren
Value at Risk (VaR) estimates the maximum loss a portfolio may incur at a given confidence level over a specified time, while expected shortfall (ES) determines the probability weighted losses greater than VaR. VaR has recently been replaced by (but remains a crucial step in the computation of) ES by the Basel Committee on Banking Supervision (BCBS) as the primary metric for banks to forecast market risk and allocate the relevant amount of regulatory market risk capital. The aim of the study is to introduce a more accurate approach of measuring VaR and hence ES determined using loss forecast accuracy. VaR (hence ES) is unobservable and depends on subjective measures like volatility, more accurate (loss forecast) estimates of both are constantly sought. Modelling the volatility of asset returns as a stochastic process, so a Kalman filter (which distinguishes and isolates noise from data using Bayesian statistics and variance reduction) is used to estimate both market risk metrics. A variety of volatility estimates, including the Kalman filter's recursive approach, are used to measure VaR and ES. Loss forecast accuracy is then computed and compared. The Kalman filter produces the most accurate loss forecast estimates in periods of both calm and volatile markets. The Kalman filter provides the most accurate forecasts of future market risk losses compared with standard methods which results in more accurate provision of regulatory market risk capital.
风险价值(VaR)估算投资组合在特定时间内特定置信水平下可能产生的最大损失,而预期缺口(ES)则确定大于风险价值的概率加权损失。巴塞尔银行监管委员会(BCBS)最近用 ES 取代了 VaR(但 ES 仍是计算 ES 的关键步骤),作为银行预测市场风险和分配相关监管市场风险资本的主要指标。本研究的目的是引入一种更准确的方法来衡量风险价值,进而利用损失预测的准确性来确定 ES。风险价值率(进而 ES)是不可观测的,并依赖于波动率等主观衡量标准,因此人们一直在寻求对二者进行更准确的(损失预测)估算。将资产收益的波动率建模为一个随机过程,因此使用卡尔曼滤波器(利用贝叶斯统计和方差缩小从数据中区分和隔离噪音)来估算这两个市场风险指标。各种波动率估算,包括卡尔曼滤波器的递归方法,都被用来衡量 VaR 和 ES。然后计算并比较损失预测的准确性。在市场平静和波动时期,卡尔曼滤波器都能得出最准确的损失预测估计值。与标准方法相比,卡尔曼滤波法能最准确地预测未来市场风险损失,从而更准确地提供监管市场风险资本。
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引用次数: 0
Interaction between Migration and Economic Growth through Unemployment in the Context of Political Instability in the MENA Region 中东和北非地区政治不稳定背景下通过失业实现移民与经济增长之间的互动关系
Pub Date : 2024-01-20 DOI: 10.32479/ijefi.15419
A. Mtiraoui
This article aims to elucidate the direct and indirect repercussions of migration on economic growth, specifically examining its interaction with unemployment within a backdrop of political instability. Employing a simultaneous equation model, our study spans the period from 1990 to 2020, providing comprehensive insights into the intricate dynamics at play. The findings affirm a global resonance, particularly resonating across the majority of Middle East and North Africa (MENA) nations. Our empirical contribution endeavors to underscore the synergies between political instability and migration while unraveling the nuanced interplay among migration, unemployment, and economic growth within the confines of our study region. This analysis not only contributes to the existing body of knowledge but also underscores the complexity and multifaceted nature of these interactions in the MENA region.
本文旨在阐明移民对经济增长的直接和间接影响,特别是研究在政治不稳定的背景下移民与失业之间的相互作用。我们的研究采用了一个同步方程模型,时间跨度从 1990 年到 2020 年,全面揭示了其中错综复杂的动态变化。研究结果在全球范围内产生了共鸣,尤其是在中东和北非(MENA)的大多数国家引起了共鸣。我们的经验性贡献旨在强调政治不稳定与移民之间的协同作用,同时在我们的研究区域范围内揭示移民、失业和经济增长之间微妙的相互作用。这一分析不仅为现有知识体系做出了贡献,还强调了中东和北非地区这些相互作用的复杂性和多面性。
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引用次数: 0
Design and Implementation of Social Safety Nets in Tanzania: A Systematic Review 坦桑尼亚社会安全网的设计与实施:系统回顾
Pub Date : 2024-01-20 DOI: 10.32479/ijefi.15523
Basil Msuha, L. Kissoly, Arnold Kihaule
Social safety nets (SSNs) in Africa have become a key strategy for addressing poverty and vulnerability. However, the effectiveness of this policy instrument is dependent on design and implementation features. Much of the evidence on the design and implementation of SSNs from systematic literature reviews is skewed toward Latin America, Asia, and to a limited extent, Africa. Using preferred reporting items for systematic reviews and meta-analyses (PRISMA) methodology we aim to address this gap.  Based on evidence extracted from 17 studies, we found more than 12 SSNs types in Tanzania, grouped into cash-based transfers, in-kind-based transfers, and public works which is consistent with the view that every country in Sub-Saharan Africa is implementing at least one type of SSNs. Subsequently, we found that the SSNs do not have a recertification program because most them were designed as time-bound, for which recertification was not necessary; and they were initially conceived to alleviate chronic poverty; thus, a maximum duration was not needed. Yet, existing design and implementation features generate inefficiency through duplications and overlaps, and limit potential coverage and performance. 
在非洲,社会安全网(SSN)已成为解决贫困和脆弱性问题的一项重要战略。然而,这一政策工具的有效性取决于设计和实施特点。系统性文献综述中有关社会安全网设计和实施的大部分证据都偏向于拉丁美洲和亚洲,在有限程度上也偏向于非洲。我们采用系统综述和荟萃分析的首选报告项目(PRISMA)方法,旨在弥补这一不足。 根据从 17 项研究中提取的证据,我们在坦桑尼亚发现了 12 种以上的社会保障网,分为现金转移支付、实物转移支付和公共工程,这与撒哈拉以南非洲的每个国家都在实施至少一种社会保障网的观点是一致的。随后,我们发现 SSN 没有重新认证计划,因为大多数 SSN 的设计都是有时限的,不需要重新认证;而且 SSN 最初的设想是为了缓解长期贫困,因此不需要最长期限。然而,现有的设计和实施特点因重复和重叠而导致效率低下,并限制了潜在的覆盖面和绩效。
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引用次数: 0
Modelling Factors Influencing Bank Customers’ Readiness for Artificial Intelligent Banking Products 模拟影响银行客户使用人工智能银行产品的因素
Pub Date : 2024-01-20 DOI: 10.32479/ijefi.15238
L. Garekwe, S. Ferreira-Schenk, Z. Dickason-Koekemoer
In the era of globalisation and technological development, artificial intelligence (AI) plays a significant role in financial activities and services. AI in financial technology has a clear potential to accelerate the financial industry's transformation by offering excellent value to customers by providing tailor-made products and services, thus improving customer experience. The paper aims to model the factors influencing bank customers' readiness for artificially intelligent banking products within the South African banking sector. Data were collected from 346 banking customers within South Africa. The study results revealed that demographic and socio-cultural variables influence the readiness for artificially intelligent banking products. Behavioural finance biases also influence bank customers' readiness for artificially intelligent banking products. Furthermore, the study also found that customers' readiness for artificial intelligent banking products is faced with the limitation of the inaccessibility to technological tools in rural areas. Consequently, policies that can improve infrastructure and enable rural citizens to cope with advanced technology can improve bank customers' readiness for artificially intelligent banking products in South Africa.
在全球化和科技发展的时代,人工智能(AI)在金融活动和服务中发挥着重要作用。金融科技中的人工智能显然具有加速金融业转型的潜力,它通过提供量身定制的产品和服务为客户提供卓越价值,从而改善客户体验。本文旨在模拟影响南非银行业客户对人工智能银行产品的准备程度的因素。本文收集了南非 346 名银行客户的数据。研究结果显示,人口统计学和社会文化变量会影响人工智能银行产品的使用意愿。行为金融偏差也会影响银行客户对人工智能银行产品的接受程度。此外,研究还发现,客户对人工智能银行产品的准备程度面临着农村地区无法获得技术工具的限制。因此,能够改善基础设施并使农村居民能够使用先进技术的政策可以提高南非银行客户对人工智能银行产品的接受程度。
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引用次数: 0
The Effect of Tax Avoidance and Tax Evasion on the Performance of South African Economy 避税和逃税对南非经济表现的影响
Pub Date : 2024-01-20 DOI: 10.32479/ijefi.15221
J. D. Mvunabandi, Bomi Nomala, Ferina Marimuthu
Using a quantitative longitudinal trends analysis, this study analysed the link between tax evasion and avoidance. The main aim was to assess the implications of evasion and avoidance of taxes on South African economy progress from 1994-2021. Publically secondary data available from South African Revenue authority were gathered. The data gathered provided us with basis of longitudinal statistical analysis of the extent of tax evasion and or tax avoidance affected the economic growth in the years 1994-2021. The Eviews 10 Results was used to estimate elasticities and buoyancies for major taxes with respect of South Africa’s economic growth for years 1994-2021. The natural logarithm of the gap between total budgeted tax income and realised tax income was also employed as a metric of tax evasion and avoidance in South Africa for this key research work. Ordinary Least Squares Regression (OLS) regression analysis was employed to evaluate whether the link between Gross Domestic Product (GDP) and tax evaded and avoided is strong or weak. Test for stationarity to see whether the parameter does not vary over time and for OLS was performed. The overall analysis of tax evasion and avoidance upon South African economy showed the increased tax revenue resulted in surpluses between tax revenue budgeted, tax revenue collected and economic growth (GDP), meaning tax evasion and avoidance in South Africa are minimal.  The study's findings disprove prior studies that suggest that tax evasion and tax avoidance seriously affect Gross Domestic Products (GDP) and refute the null hypothesis of this study. However, the study’s results further revealed that increasing tax rates was said to have triggered a positive trend towards economic growth or GDP (actual revenue collected is more than expected taxation revenue annually to cover tax evaded and avoided.   As far as policy is concerned the conclusion is reassuring that tax evasion and avoidance has minimal effect upon economic growth as long as tax rates are being risen. The results of this study provide implications for government that specific insights should allow policy makers to gain a better understanding on the key variables that are potentially associated with tax evasion and avoidance. Finally, the study contributes knowledge that is pertinent to an emerging country and provides much needed insights into the magnitude of the extent of tax evasion and avoidance on the county’s economic growth progress.       
本研究采用定量纵向趋势分析法,分析了逃税和避税之间的联系。主要目的是评估 1994-2021 年间逃税和避税对南非经济发展的影响。我们收集了南非税务局提供的公开二手数据。收集到的数据为我们对 1994-2021 年间逃税和避税对经济增长的影响程度进行纵向统计分析提供了依据。我们使用 Eviews 10 Results 估算了 1994-2021 年主要税种对南非经济增长的弹性和浮力。预算税收总收入与实际税收收入之间差距的自然对数也被用作衡量南非逃税和避税情况的指标。采用普通最小二乘法(OLS)回归分析来评估国内生产总值(GDP)与逃税和避税之间的联系是强还是弱。进行了静态检验,以确定参数是否不随时间和 OLS 而变化。对逃税和避税对南非经济影响的总体分析表明,税收的增加导致税收预算、税收征收和经济增长(GDP)之间出现盈余,这意味着南非的逃税和避税现象微乎其微。 研究结果推翻了之前关于逃税和避税严重影响国内生产总值(GDP)的研究,并反驳了本研究的零假设。然而,研究结果进一步显示,提高税率被认为引发了经济增长或国内生产总值的积极趋势(每年实际征收的税款多于预期的税收收入,以弥补逃税和避税。 就政策而言,这一结论令人欣慰,即只要提高税率,逃税和避税对经济增长的影响就微乎其微。这项研究的结果为政府提供了启示,具体的见解应使政策制定者更好地了解可能与逃税和避税相关的关键变量。最后,本研究为新兴国家提供了相关知识,并就逃税和避税对国家经济增长的影响程度提供了急需的见解。
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引用次数: 0
Political Polarization and Internal Conflict: A Cross-National Analysis Using Popular Support and Government Cohesion as Proxies 政治极化与内部冲突:以民众支持率和政府凝聚力为代用指标的跨国分析
Pub Date : 2024-01-20 DOI: 10.32479/ijefi.15368
Brandon Parsons
The study uses proxies of political polarization, popular support of the government, and government cohesion, to examine its role in explaining internal conflict and the specific types of political violence and civil disorder. The study uses panel data from 135 countries from 1990 to 2021. The research uses two econometric models, Quantile via Moments, to examine the effects of popular support and government cohesion across the distribution of internal conflict, and two-way fixed effects with Driscoll and Kraay standard errors. The two models account for heteroscedasticity, cross-sectional dependence, and autocorrelation. The study finds popular support of the government and its cohesion robustly explain internal conflict and its specific forms of political violence and civil disorder. The research also finds political polarization that reduces popular support and government cohesion influences internal conflict regardless of regime type. The variables are significant from autocratic to democratic, suggesting political polarization that reduces popular support and government cohesion can negatively affect internal conflict levels irrespective of regime.  Finally, the study finds the internet has a minor mitigating impact on internal conflict, while its interaction with popular support and government cohesion slightly exacerbates internal conflict.
本研究使用政治两极分化、民众对政府的支持以及政府凝聚力等代用指标,考察其在解释内部冲突以及政治暴力和内乱的具体类型方面所起的作用。研究使用了 135 个国家从 1990 年到 2021 年的面板数据。研究使用了两个计量经济学模型,即通过矩量检验民众支持和政府凝聚力在内部冲突分布中的影响,以及使用 Driscoll 和 Kraay 标准误差的双向固定效应模型。这两个模型考虑了异方差、横截面依赖性和自相关性。研究发现,民众对政府的支持及其凝聚力可以有力地解释内部冲突及其政治暴力和内乱的具体形式。研究还发现,政治两极分化会降低民众支持率和政府凝聚力,从而影响国内冲突,而与政权类型无关。从专制到民主,这些变量都具有显著性,这表明减少民众支持和政府凝聚力的政治极化会对国内冲突水平产生负面影响,而与政权类型无关。 最后,研究发现,互联网对内部冲突的缓解作用较小,而其与民众支持和政府凝聚力的相互作用则会轻微加剧内部冲突。
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引用次数: 0
Analyzing the Impact of Quality of Public Governance on the Market Value of Companies Listed on the Amman Stock Exchange 分析公共治理质量对安曼证券交易所上市公司市场价值的影响
Pub Date : 2024-01-20 DOI: 10.32479/ijefi.15371
Amjad S. Qwader
This study aimed to examine the impact of public governance quality on the market value of companies listed on the Amman Stock Exchange from 2002 to 2021. The study utilized the Autoregressive Distributed Lag (ARDL) model to analyze slow-moving distributed time series. The findings indicated a significant and positive correlation between various indicators of quality of public governance, such as voting and accountability, political stability and absence of violence, and organizational quality, with the market value of the listed companies. These results align with economic theory assumptions. However, in terms of Monetary freedom, another important indicator of the quality of public governance, the study found no statistically significant relationship with the market value of the listed companies at a significant level. This observation may be attributed to the government's limited capacity to manage the country's public financial resources efficiently and effectively, particularly regarding transparent and responsible administration of taxation, debt, and government expenditure.
本研究旨在探讨 2002 年至 2021 年期间公共治理质量对安曼证券交易所上市公司市场价值的影响。研究采用了自回归分布滞后(ARDL)模型来分析缓慢移动的分布式时间序列。研究结果表明,投票和问责制、政治稳定和无暴力以及组织质量等各种公共治理质量指标与上市公司的市场价值之间存在明显的正相关关系。这些结果符合经济理论假设。然而,在衡量公共治理质量的另一个重要指标--货币自由度方面,研究发现它与上市公司的市场价值在统计上没有显著的关系。出现这种情况的原因可能是政府有效管理国家公共财政资源的能力有限,特别是在税收、债务和政府支出的透明和负责任的管理方面。
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引用次数: 0
The Relationship Between Informal Economy and Income Inequality: An Econometric Analysis for BRICS Countries 非正规经济与收入不平等之间的关系:金砖国家计量经济学分析
Pub Date : 2024-01-20 DOI: 10.32479/ijefi.15664
Hakan Kum
This research investigates the intricate relationship between the informal economy and income inequality in BRICS nations from 2000 to 2018. Defining the informal economy as economic activities outside the formal sector contributing to GDP, the study addresses a gap in existing literature that tends to overlook this sector's impact on income distribution. Utilizing panel unit root and panel cointegration tests, the findings reveal a significant and direct correlation between income inequality, the informal economy, and GDP in BRICS countries. The study uncovers a noteworthy revelation: a 1% increase in the informal economy leads to a substantial 3.24% rise in the GINI coefficient, showcasing the informal sector's profound influence on income inequality. Country-specific analyses identify India and Russia as frontrunners in this correlation, with China, Brazil, and South Africa following suit. Intriguingly, the analysis indicates that while a 1% rise in official GDP slightly worsens income distribution, the informal economy exerts a disproportionately negative impact on income inequality. This research provides valuable insights for policymakers, emphasizing the need to consider the informal economy's role in crafting effective strategies for mitigating income inequality within the BRICS context.
本研究调查了 2000 年至 2018 年金砖国家非正规经济与收入不平等之间错综复杂的关系。本研究将非正规经济定义为正规经济部门之外对国内生产总值有贡献的经济活动,从而弥补了现有文献中往往忽视非正规经济部门对收入分配影响的空白。利用面板单位根和面板协整检验,研究结果显示,金砖国家的收入不平等、非正规经济和国内生产总值之间存在显著的直接相关性。研究发现了一个值得注意的启示:非正规经济每增长 1%,GINI 系数就会大幅上升 3.24%,这显示了非正规经济部门对收入不平等的深刻影响。国别分析表明,印度和俄罗斯在这种相关性方面走在前列,中国、巴西和南非紧随其后。耐人寻味的是,分析表明,虽然官方 GDP 每增长 1%,收入分配就会略微恶化,但非正规经济却对收入不平等产生了不成比例的负面影响。这项研究为政策制定者提供了宝贵的见解,强调了在金砖五国范围内制定有效的缓解收入不平等战略时考虑非正规经济作用的必要性。
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引用次数: 0
Unveiling COVID-19’s impact on Financial Stability: A Comprehensive Study of Price Dynamics and Investor Behavior in G7 Markets 揭示 COVID-19 对金融稳定性的影响:七国集团市场价格动态和投资者行为综合研究
Pub Date : 2024-01-20 DOI: 10.32479/ijefi.15643
Mariem Talbi, Monia Mokhtar Ferchichi, Fatma Ismaalia, Samia Samil
The paper delves into the impact of the COVID-19 pandemic on foreign stock markets across several developed nations. It seeks to empirically validate the presence of contagion by employing an adjusted correlation test spanning 7 developing stock markets from February 1, 1992, to April 31, 2021. Employing the FIEGARCH (1.1), DCC-MGARCH(1,1), and Switching-Markov analysis models, the research uncovers compelling evidence of the pandemic's influence on most developed countries during the COVID-19 period. Notably, these markets appear significantly susceptible to the adverse effects brought about by the pandemic. Recognizing the substantial ramifications of financial downturns on monetary policy, risk assessment, asset valuation, and portfolio distribution, the findings hold paramount significance for policymakers, investors, and portfolio managers. This empirical investigation offers insights that could profoundly impact decision-making strategies in these domains, shedding light on crucial aspects for informed policy adjustments, investment decisions, and portfolio allocations amidst such critical market fluctuations.
本文探讨了 COVID-19 大流行病对几个发达国家的外国股票市场的影响。通过对 1992 年 2 月 1 日至 2021 年 4 月 31 日期间的 7 个发展中股票市场进行调整相关性检验,本文试图从经验上验证传染的存在。研究采用 FIEGARCH (1.1)、DCC-MGARCH(1,1) 和 Switching-Markov 分析模型,发现了在 COVID-19 期间大流行病对大多数发达国家产生影响的有力证据。值得注意的是,这些市场似乎很容易受到大流行病带来的不利影响。考虑到金融衰退对货币政策、风险评估、资产估值和投资组合分布的重大影响,研究结果对政策制定者、投资者和投资组合经理具有重要意义。这项实证调查提供了可能对这些领域的决策策略产生深远影响的见解,揭示了在这种关键的市场波动中进行明智的政策调整、投资决策和投资组合分配的重要方面。
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引用次数: 0
Public Debt and Economic Growth in Africa in the Pre-Covid Era: The Role of Control of Corruption 前科维德时期非洲的公共债务与经济增长:控制腐败的作用
Pub Date : 2024-01-20 DOI: 10.32479/ijefi.15113
A. Abotsi, Isaac Kwesi Ampah
There is evidence of recent rising public debts and low economic growth in Africa which is being attributed to the COVID-19 pandemic and the geopolitical tensions from the Russia-Ukraine war. With the evidence of also recent high corruption amidst low investments in Africa, it is thought-provoking to find empirically how public debt impact on economic growth per capita among African countries even before the COVID-19 pandemic and the geopolitical tensions from the Russia-Ukraine war with the mediation of control of corruption. The study used secondary data from the World Development Indicators, World Economic Outlook, and Worldwide Governance Indicators. The annual data spans from 1996 to 2019 for 45 countries. The study deployed a dynamic panel data estimation technique and controlled for other variables. The findings show a negative impact of gross debt percentage of GDP on economic growth but a positive interactive effect of excessive accumulation of gross public debt and the control of corruption on economic growth per capita among countries in Africa before the outbreak of the COVID-19 pandemic. In this COVID era of high public debt, governments can reduce their indebtedness by financing appropriate infrastructure while controlling corruption to increase the economic growth in their countries.
有证据表明,最近非洲的公共债务不断增加,而经济增长却很低,这要归咎于 COVID-19 大流行病和俄罗斯-乌克兰战争造成的地缘政治紧张局势。有证据表明,近期非洲在低投资的同时腐败现象也很严重,因此,即使在 COVID-19 大流行病和俄乌战争造成的地缘政治紧张局势之前,通过控制腐败的调解,从经验上找出公共债务对非洲国家人均经济增长的影响也是发人深省的。研究使用了《世界发展指标》、《世界经济展望》和《全球治理指标》中的二手数据。年度数据的时间跨度为 1996 年至 2019 年,涉及 45 个国家。研究采用了动态面板数据估算技术,并对其他变量进行了控制。研究结果表明,在 COVID-19 大流行爆发之前,债务总额占 GDP 的百分比对经济增长有负面影响,但公共债务总额的过度积累和腐败控制对非洲国家的人均经济增长有积极的互动影响。在这个公共债务高企的 COVID 时代,各国政府可以通过资助适当的基础设施来减少债务,同时控制腐败,以提高本国的经济增长。
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引用次数: 0
期刊
International Journal of Economics and Financial Issues
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