Research Article |
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Corresponding author: Mariam Reha ( rahamariam111@gmail.com ) Academic editor: Marina Sheresheva
© 2026 Yang Jingjing, Shah Mir Mowahed, Mariam Reha.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Jingjing Y, Mowahed SM, Reha M (2026) Quantile Evidence on Institutional Quality and Economic Growth in a Fragile State: The Case of Afghanistan. BRICS Journal of Economics 7(1): 49-84. https://doi.org/10.3897/brics-econ.7.e170868
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In recent decades, the role of institutions has become a central topic of discussion among scholars and policy makers. This study used time-series data from Afghanistan between 1996 and 2024 to gain new insights into the impact of political instability (POI), corruption (COR) and government effectiveness (GEF) on economic growth. The results of Quantile-on-Quantile Regression and Wavelet Quantile regression reveal that POI, COR, and GEF have adverse and statistically significant effects on GDP growth across all quantiles and over long-term time periods. Event analysis through the interrupted time series technique shows that the key political events, including the Civil War (CW), the First Round of the Taliban Regime (FRTR), U.S.-NATO interventions (USN), the Second Round of Taliban Regime (SRTR), and Regime Changes (RCH), have had a negative impact on Afghanistan’s GDP growth. The immediate impact of the Soviet Union’s war is estimated to be positive. At the same time, Afghanistan’s GDP experienced negative growth during SUW, CW, FRTR, and RCH, while during USN and SRTR, the GDP growth was positive. Based on these findings, the paper discusses possible policy implications.
GDP Growth, Institutional Quality, Quantiles Analysis, ITS approach
In recent decades, economists, academics and policy makers have paid significant attention to the relationship between economic growth and institutions.
The concept of “institutions” encompasses several key elements, including the rule of law, control of corruption, government effectiveness, quality of regulation, voice and accountability, stability of political systems, protection of property rights, independence of the judiciary, economic freedom and the size of public sector. The study focuses on the impact of political instability, corruption and government effectiveness on economic growth in Afghanistan.
Over the past fifty years, Afghanistan has struggled to establish state and public institutions. This has been a difficult task due to deep socio-economic crises, poor governance, foreign interventions, civil war and persistent political instability (
However, despite the relative political stability between 1933 and 1978, the country’s formal institutions were weak, heavily reliant on foreign aid, lacking the administrative capacity necessary to support broad-based economic development. Later political events, including the Soviet invasion and the ensuing civil war, the first and second Taliban regimes, and the U.S.-led intervention, further exacerbated institutional fragility (
In this war-torn country, discussions about the concept and role of institutions - particularly their ability to help the government provide public services, uphold the rule of law, protect national security and territorial integrity, and safeguard citizens’ rights and freedoms — resumed after the year 2001 (
Based on the information provided and our best understanding, this is the first empirical study of the relationship between institutional quality and economic growth in Afghanistan. Seeking to evaluate this relationship, we will use econometric techniques to answer the following research question:
RQ: How do political instability, corruption, and government (in)effectiveness influence economic performance in a country with a fragile institutional system, such as Afghanistan, in the short, medium, and long term?
By providing an answer to this RQ based on the empirical analysis, our study contributes to the existing literature in several ways. First, in line with most empirical studies, this paper provides evidence that political instability, corruption, and government (in)effectiveness have a negative impact on economic growth in the short, medium, and long term in Afghanistan. Second, our empirical findings show that political instability, corruption, and government effectiveness are not only economically relevant for developed and developing economies, but also have implications for the prosperity of Afghanistan and other less developed and war-torn nations. Third, our findings concerning the impact of corruption on economic growth support the theory of “sanding the wheels”, suggesting that corruption acts as a significant barrier to economic growth in Afghanistan. Finally, in addition to using advanced econometric approaches such as Quantile-on-Quantile Regression (QQR) and Wavelet Quantile Regression (WQR), which capture the effects of the explanatory variables’ quantiles on different quantiles of the dependent variable(s), this study also employs the Wavelet Quantile Correlation (WQC) technique for robustness verification and the Interrupted Time Series (ITS) method for event analysis. Collectively, these methodologies ensure the use of the most appropriate and rigorous econometric tools in order to effectively address the proposed research question (RQ).
The rest of the study is organized as follows: Section 2 reviews the related empirical studies, Section 3 provides information about the data and methodology, Section 4 focuses on the interpretation of the empirical findings, and Section 5 reports the conclusions and policy recommendations.
The fundamental drivers of economic growth have been the subject of intensive scholarly debate for a long time. Some scholars emphasise the pivotal role of human capital, which is the key engine for economic performance. This is supported by the work of
Building upon the institutional perspective, recent empirical studies have increasingly sought to examine how institutional quality and stability influence economic performance across countries. For instance, Acemoglu et al. (2000, 2001, 2014), North (1990, 2003), and
Corruption is another significant factor affecting economic performance of a nation, which depends on the quality of institutions and governance. Its impact on economic growth is explained by two competing hypotheses. According to the “greasing the wheels” hypothesis, corruption occurs in economies suffering from weak governance and, by speeding up administrative procedures and overcoming bureaucratic bottlenecks at low cost, stimulates economic activities (
The third factor that poses a threat to the quality of governance and, hence, to economic performance, is institutional fragility. Fragile institutions often lack the ability to enforce laws, provide public services efficiently, and maintain accountability mechanisms. This undermines the overall capacity of the state (
The literature emphasizes that weak institutions and corruption hinder economic performance and prevent wider development outcomes.
Collectively, these studies confirm that institutional fragility — manifested through corruption, weak governance, and political instability — remains a central barrier to stability and growth in fragile countries. However, despite extensive research into similar contexts, the non-linear effects of political instability, corruption, and government (in)effectiveness on Afghanistan’s GDP growth remain empirically unexplored, which underscores the significance of the present study.
This section provides detailed information about the econometric model, the dataset, and the steps of the novel empirical technique used in this study. It also explains the justification for this approach.
To examine the impacts of political instability (POI), corruption (COR), and government effectiveness (GEF), following Dirks & Schmidt (2024),
GDPt = f (POIt , CORt , GEFt) (1)
where GDPt is the gross domestic product, POIt denotes political (in)stability, CORt shows control of corruption, and GEFt stands for government effectiveness.
To empirically estimate model (1), this study utilizes a time series dataset for Afghanistan covering the period from 1996 to 2024 (see Panel A of Table
| Variables | Acronyms | Definition and measurement |
| Panel A: Data related to GDP, POI, COR, and GEF will be used for conducting baseline analysis using QQR and WQR techniques, and robustness checks analysis using the WQC technique. | ||
| Economic Growth | GDP | Gross domestic product (constant, US$, 2015) |
| Political (In)stability Index | POI | Political instability measures perceptions of the likelihood of overthrow by unconstitutional means or violence and terrorism. |
| Control of corruption | COR | Control of the corruption measures the degree to which the government uses its power for personal gain, encompassing both small-scale and large-scale corruption, as well as the “capture” of the state by elites and private interests. |
| Government Effectiveness Index | GEF | Government Effectiveness: Standard Error |
| Panel B: Data related to GDP, SUW, CW, FRTR, USN, and SRTR will be used for conducting event analysis using the ITS technique. | ||
| Economic Growth | GDP | Gross domestic product (constant, US$, 2015) |
| Soviet Union War | SUW | The dummy variable takes the value 1 for the war period (1979-1989) and otherwise 0. |
| Civil War, including the Taliban First Round Regime | CW | The dummy variable takes the value 1 for the war period (1989-2001) and otherwise 0. |
| First Round Taliban Regime | FRTR | The dummy variable takes the value 1 for the war period (1996-2001) and otherwise 0. |
| United States and NATO Military Presence | USN | The dummy variable takes the value 1 for the war period (2001-2021) and otherwise 0. |
| Second Round Taliban Regime | SRTR | The dummy variable takes the value 1 for the war period (2021-2024) and otherwise 0. |
To capture the pre-event economic growth trajectory, the immediate impact of the event, and the subsequent growth trend, this study extends the GDP data from 1996–2024 to 1975–2024 and incorporates several dummy variables (see Panel B of Table
This study uses GDP as the primary dependent variable, while the key independent variables include POI, COR, and GEF. The dataset is sourced from the World Development Indicators (WDI) and World Governance Indicators (WGI) databases. Table
Fig.
To empirically examine the impact of POI, COR, and GEF on GDP growth, we employ Quantile-on-Quantile Regression (QQR) and Wavelet Quantile Regression (WQR) to estimate the baseline results. For robustness checks aimed at validating the reliability of the QQR and WQR findings, we use Wavelet Quantile Correlation (WQC), and, finally, we apply the Interrupted Time Series (ITS) method to examine the impact of major political events on growth in Afghanistan.
This study examines the non-linear effects of explanatory variables on the dependent variable using Quantile-on-Quantile Regression (QQR) and Wavelet Quantile Regression (WQR).
where θ and Φ show the quantiles (0.05–0.95) of the Y and X, and stands for error term with θ — quantiles. Additionally, part (*) of Eq. (2) represents the dependence structure between dependent and independent variables through their respective distributions. Moreover, following
(3)
where Φ1, Φ2, …, Φn quantify the quantiles of X1, X2, ... Xn, respectively, and the θ shows the quantile of Y. In this paper, the QQR implementation procedure follows the studies by
The WQR technique, proposed by
(4)
(5)
Following the same steps, we employ a similar method to filter α1[i], using modified filters h2[i] and g2[i] obtained from the dyadic up-sampling of g1[i] and h1[i]. This recursive process is carried out iteratively. For values of J spanning from 1 to j0 – 1, where J0 ≤ J, we can calculate the coefficients of the approximate and detailed as follows:
(6)
(7)
In this context, hj + 1[i] = U(hj[i]) and gj + 1[i] = U(gj[i]), where the up-sampling operation is illustrated by operator U. This operation involves inserting a zero value between each consecutive pair of time series.
Following the application of a J-level decomposition to Yt and Xt, and the subsequent acquisition of the detail coefficients, we proceed to implement QR on the pair of WQR details, dj(Y) and dj(X), for all levels of J. Consequently, we derive the WQR outcomes for each level of J. Finally, the WQR technique for the dependent variable Y and the independent variable X at a specific decomposition level J, and for a given quantile q, can be rewritten as follows:
(8)
To verify the reliability of the baseline results, we employ the WQC technique. The WQC technique proposed by
(9)
where qcovt(Yt ,Xt) presents the quantile correlation between the two series.
To extend the described method, following Kumar and Padakandla’s (2022), this study decomposed the modeled series, such as Yt and Xt, using the MODWT technique at Jth level, and obtained the WQC for each J level based on the following mathematical equation.
(10)
Eq. (10) shows the WQC between the modeled series, such as Y and X. This method can handle potential outliers in the data and produce consistent results (
Fig.
Before conducting the primary analysis, we performed several preliminary calculations and tests. These included descriptive statistics, correlation analysis, unit root tests for quantiles and the nonlinear BDS test. The purpose of these tests was to capture the characteristics of the variables used in our study.
Table
| Variables | GDP | POI | COR | GEF |
| Mean | 23.229 | 0.303 | 0.222 | 0.260 |
| Std. dev. | 0.446 | 0.085 | 0.069 | 0.034 |
| Min | 22.449 | 0.208 | 0.154 | 0.187 |
| Max | 23.773 | 0.474 | 0.352 | 0.331 |
| Skewness | -0.301 | 0.776 | 0.822 | 0.167 |
| Kurtosis | -1.497 | -0.868 | -0.908 | -0.725 |
| Jarque-Bera | 3.150 | 3.827 | 4.270 | 0.772 |
| p-values | 0.206 | 0.147 | 0.118 | 0.679 |
| Obs. | 29 | 29 | 29 | 29 |
Fig.
Finally, we performed the BDS test introduced by
| Dimensions | GDP = f(POI) | GDP = f(COR) | GDP = f(GEF) |
| Dimensions-II | 23.188*** (0.000) | 27.585*** (0.000) | 10.073*** (0.000) |
| Dimensions-III | 32.399*** (0.000) | 38.338*** (0.000) | 14.355*** (0.000) |
| Dimensions-IV | 93.995*** (0.000) | 120.606*** (0.000) | 10.179*** (0.000) |
| Dimensions-V | 120.188*** (0.000) | 152.834*** (0.000) | 10.415*** (0.000) |
| Dimensions-VI | 25.235*** (0.000) | 38.943*** (0.000) | 7.859*** (0.000) |
| Dimensions-VII | 27.811*** (0.000) | 44.714*** (0.000) | 7.497*** (0.000) |
To evaluate the non-linear impacts of POI, COR, and GEF on GDP in the context of Afghanistan, we used the QQR technique and the results of this method are shown in Fig.
In lower and middle GDP quantiles, where the economy is already weak, POI exacerbates vulnerabilities due to fragile institutions, weak role of low-income groups, and inconsistent policy implementation. This result presents a current image of political economy in Afghanistan, with its fragile institutions and government deficits over the past three decades. Frequent regime changes and contested governance reduce investor confidence, disrupt aid flows and weaken the delivery of government services, collectively hindering the positive dynamics of GDP growth (
Additionally, POI frequently leads to policy reversals and disrupted long-run development strategies, which prevents the accumulation of human capital, limits technological innovation, and hinders macroeconomic planning and public-private collaboration. Political unrest inhibits foreign direct investment and prevents the local capital holders from externalizing assets. As a result, the base for industrial growth and job creation is shrinking. This is especially true for Afghanistan, whose economy relies heavily on external aid, trading routes, and geopolitical dynamics. These findings are supported by empirical literature, including
Moreover, Fig.
The persistent negative impact of COR on GDP supports the “sanding the wheels” hypothesis, suggesting that COR impedes rather than facilitates growth by increasing transaction costs, lowering institutional efficiency, and degrading public trust. Furthermore, the gradual move toward zero from the medium to the higher quantiles may reflect the growth resilience of the system in the face of COR, but still shows that COR acts as a structural ceiling on Afghanistan’s economic performance.
Afghanistan’s public sector is characterized by weak legal enforcement and limited bureaucratic capacity, where COR deters GDP growth by undermining trust in government and discouraging both domestic and foreign investment. Additionally, COR often redirects government spending from productive sectors, such as infrastructure and education, toward low-return patronage networks (
Fig.
Theoretically, the non-linear relationship between GEF and GDP growth in Afghanistan can be explained through the lens of institutional transition theory and governance traps. The most significant negative impact on GDP is from the middle and high quantile of GEF. At the extremes of the distribution, there are weaker adverse effects. This pattern suggests that partial or fragmented improvements to governance may initially destabilize informal economic arrangements, without delivering the necessary institutional coherence to support sustained economic growth (
In the case of Afghanistan, medium quantiles may represent transition phases, where reforms are often driven externally, disrupting rent-seeking networks and informal governance structures. At the same time, the reforms lack the capacity or legitimacy to replace these structures with functional alternatives. The resulting institutional incoherence can suppress growth by increasing uncertainty, overregulation, and policy inconsistency (
The numerical values of Figs.
Building on the confirmed non-linear impacts of POI, COR, and GEF on GDP growth established in the previous section, this paper employs the Wavelet Quantile Regression (WQR) methodology to examine the associations between these explanatory variables and GDP growth in the short, medium, and long term. In contrast to conventional quantile regression (QR), which is effective at handling non-linear relationships, wavelet quantile regression (WQR) offers enhanced flexibility by analyzing the impact of explanatory variables over various time horizons and quantiles. This allows for the capture of a more diverse range of non-linear patterns. The results of the WQR analysis are presented in Fig.
Fig.
Similarly, Fig.
Finally, Fig.
The numerical values of Figs.
To verify the reliability of the findings obtained through the Quantile-on-Quantile Regression (QQR) and Wavelet Quantile Regression (WQR) methodologies, we use the Wavelet Quantile Correlation (WQC) technique. The results concerning the quantile correlation between the response variable (GDP) and the explanatory variables (POI, COR, and GEF) are presented in Fig.
Fig.
Finally, Fig.
To further enhance the analysis in this paper, we have examined the impact of several significant political events on Afghanistan’s GDP growth by using data from Panel B of Table
(11)
where LnGDP stands for the natural log of total GDP, ϑ0 is the baseline intercept, ϑ1 is the baseline trend (before intervention), ϑ2 is the level change (immediate effect) right after the intervention, and ϑ3 slope change (trend effect) during the intervention.
Table
| Variables | Coefficient | t-statistic | P >|t| |
|---|---|---|---|
| Variables | Coefficient | t-statistic | P >|t| |
| Panel A: The Impact of the Soviet Union-Afghan War on Afghanistan’s GDP. | |||
| Pre-SUW-G | 0.027*** | 9.922 | 0.000 |
| IE-SUW | 0.305* | 1.788 | 0.080 |
| GD-SUW | -0.026 | -1.187 | 0.241 |
| Adj-R2 | 0.713 | ||
| F-Statistics | 41.480 | ||
| Prob. | 0.000 | ||
| Obs. | 50 | ||
| Panel B: The impact of the Civil War on Afghanistan’s GDP. | |||
| Pre-CW-G | 0.023*** | 13.456 | 0.000 |
| IE-CW | -0.075 | -0.499 | 0.499 |
| GD-CW | -0.036*** | -2.727 | 0.009 |
| Adj-R2 | 0.835 | ||
| F-Statistics | 83.620 | ||
| Prob. | 0.000 | ||
| Obs. | 50 | ||
| Panel C: The Impact of the First Round of the Taliban Regime on Afghanistan’s GDP. | |||
| Pre-FRTR-G | 0.024*** | 11.829 | 0.000 |
| IE-FRTR | -0.175 | -0.772 | 0.444 |
| GD-FRTR | -0.055 | -0.825 | 0.414 |
| Adj-R2 | 0.756 | ||
| F-Statistics | 51.540 | ||
| Prob. | 0.000 | ||
| Obs. | 50 | ||
| Panel D: The Impact of USN military presence on Afghanistan’s GDP. | |||
| Pre-USN-G | 0.016** | 7.032 | 0.000 |
| IE-USN | -0.270*** | -3.342 | 0.000 |
| GD-USN | 0.046*** | 7.406 | 0.000 |
| Adj-R2 | 0.863 | ||
| F-Statistics | 104.100 | ||
| Prob. | 0.000 | ||
| Obs. | 50 | ||
| Panel E: The Impact of the Second Round of the Taliban Regime on Afghanistan’s GDP. | |||
| Pre-SRTR-G | 0.025*** | 16.541 | 0.000 |
| IE-SRTR | -0.114*** | -2.891 | 0.706 |
| GD-SRTR | 0.017 | -0.293 | 0.872 |
| Adj-R2 | 0.693 | ||
| F-Statistics | 37.830 | ||
| Prob. | 0.000 | ||
| Obs. | 50 | ||
| Panel F: The Impact of RCH on Afghanistan’s GDP. | |||
| Pre-RCH-G | 0.026*** | 10.993 | 0.000 |
| IE-RCH | 0.314 | 1.364 | 0.179 |
| GD-RCH | -0.116** | -2.010 | 0.050 |
| Adj-R2 | 0.722 | ||
| F-Statistics | 43.360 | ||
| Prob. | 0.000 | ||
| Obs. | 50 | ||
The SUW, which lasted from 1979 to 1989, is considered a pivotal political episode in Afghanistan’s economic history (see, for details,
Similarly, the CW constrained investment opportunities, hindered entrepreneurial activity, disrupted supply chains, destroyed infrastructure, triggered brain drain, and led to capital flight, all of which contributed to the decline in GDP performance in this war-torn country. Empirical studies, including Giustozzi (2008, 2009), D’Souza and Jolliffe (2012a, 2012b), and
The adverse effects observed during both periods of Taliban rule (FRTR and SRTR) are plausible, as these periods were characterized by violent conflict through which the Taliban consolidated power by seizing provinces via armed confrontations with rival groups. Their regime inherited a country devastated by war, subject to international sanctions, and marked by the collapse of formal institutions, as well as severe restrictions on trade, education, and women’s participation during the first round (
Between 1975 and 2024, Afghanistan experienced multiple regime changes, nearly all of which occurred through assassinations or coups d’état, with the notable exception of the transition from President Burhanuddin Rabbani to President Hamid Karzai, which was achieved through the Bonn political agreement (see
To determine whether the observed effects of each event on GDP growth were influenced by unobserved factors or random noise, a placebo test was conducted. As shown in Fig.
Finally, Fig.
In this paper, we have examined the impact of Political Instability (POI), Corruption (COR), and Government Effectiveness (GEF) on Afghanistan’s GDP performance. Using time series data from 1996 to 2024 and implementing Quantile-on-Quantile Regression (QQR) and Wavelet Quantile Regression (WQR) models, we found that POI, COR, and GEF had an adverse effect on GDP growth across all quantiles, in the long term. The results of the QQR and WQR techniques were confirmed by the Wavelet Quantile Correlation (WQC) model, indicating that POI, COR, and GEF are negatively correlated with GDP across all quantiles in the short, medium, and long term. Moreover, the event analysis revealed that, during the Soviet Union War (SUW), Civil War (CW), First Round Taliban Regime (FRTR), and Regime Changes (RCH), Afghanistan’s GDP growth had declined. During the U.S.-NATO military presence and the Second Round of the Taliban Regime (SRTR), Afghanistan’s GDP experienced positive growth.
Based on these empirical findings, the following policy recommendations can be discussed: Afghanistan must prioritize institutional reform to address the persistent adverse effects of political instability, corruption, and weak governance on GDP growth. Strengthening the rule of law through independent anti-corruption agencies, enhancing judicial transparency, and promoting merit-based recruitment in the public sector can significantly improve government effectiveness. These reforms would not only restore public trust but also attract foreign investment and foster a more stable economic environment, as evidenced by the consistent negative impact of POI, COR, and GEF across all GDP quantiles.
In light of the significant economic disruptions caused by past conflicts and regime changes, Afghanistan needs to adopt policies that are resilient to conflict. This includes designing reconstruction plans that prioritize infrastructure development, job creation, and regional equality, especially in post-conflict zones. Establishing a sovereign stabilization fund and aligning development initiatives with peacebuilding efforts can help to shield the economy from future political shocks. Such strategies are essential for breaking the cyclical relationship between conflict and economic decline, as highlighted by the results of the events analysis.
Finally, the observed positive growth of GDP during the Second Round Taliban Regime (SRTR) suggests that even under constrained political conditions, economic stabilization is possible. Policymakers and international stakeholders should consider pragmatic engagement with de facto authorities to ensure continuity in essential services and macroeconomic management. Encouraging decentralized governance and linking international aid to measurable improvements in transparency and service delivery can foster short-term stability and promote long-term development. This approach strikes a balance between the need for economic recovery and the imperative of promoting accountable governance.
| GDP-Quantiles | τ = 0.10 | τ = 0.20 | τ = 0.30 | τ = 0.40 | τ = 0.50 | τ = 0.60 | τ = 0.70 | τ = 0.80 | τ = 0.90 |
| τ = 0.10 | -0.798 | -0.942 | -0.942 | -0.942 | -0.942 | -0.968 | -0.968 | 0.322 | 0.322 |
| τ = 0.20 | -0.811 | -0.855 | -0.855 | -0.855 | -1.016 | -0.947 | -0.947 | -0.168 | -0.013 |
| τ = 0.30 | -0.620 | -0.620 | -0.620 | -0.652 | -0.924 | -0.924 | -0.874 | -0.160 | -0.160 |
| τ = 0.40 | -0.620 | -0.620 | -0.674 | -0.674 | -0.727 | -0.727 | -0.727 | -0.160 | -0.160 |
| τ = 0.50 | -0.452 | -0.526 | -0.686 | -0.686 | -0.754 | -0.754 | -0.754 | -0.157 | 0.074 |
| τ = 0.60 | -0.523 | -0.592 | -0.598 | -0.598 | -0.721 | -0.721 | -0.721 | -0.113 | 0.045 |
| τ = 0.70 | -0.548 | -0.550 | -0.550 | -0.550 | -0.662 | -0.855 | -0.855 | -0.113 | 0.043 |
| τ = 0.80 | -0.480 | -0.492 | -0.492 | -0.492 | -0.820 | -0.820 | -0.820 | -0.098 | 0.013 |
| τ = 0.90 | -0.719 | -0.719 | -0.719 | -0.719 | -0.729 | -0.719 | -0.719 | -0.064 | -0.064 |
| GDP-Quantiles | τ = 0.10 | τ = 0.20 | τ = 0.30 | τ = 0.40 | τ = 0.50 | τ = 0.60 | τ = 0.70 | τ = 0.80 | τ = 0.90 |
| τ = 0.10 | -1.577 | -1.577 | -1.577 | -1.602 | -1.602 | -1.602 | -1.602 | 0.405 | 0.405 |
| τ = 0.20 | -1.523 | -1.523 | -1.523 | -1.606 | -1.606 | -1.606 | -1.452 | -0.294 | -0.188 |
| τ = 0.30 | -1.525 | -1.525 | -1.525 | -1.525 | -1.525 | -1.525 | -0.716 | -0.229 | -0.229 |
| τ = 0.40 | -1.141 | -1.141 | -1.141 | -0.872 | -0.872 | -0.848 | -0.841 | -0.229 | -0.229 |
| τ = 0.50 | -0.860 | -0.860 | -0.860 | -0.860 | -0.860 | -0.860 | -0.806 | -0.214 | -0.214 |
| τ = 0.60 | -0.910 | -0.910 | -0.910 | -0.910 | -0.910 | -0.858 | -0.823 | -0.179 | -0.018 |
| τ = 0.70 | -0.787 | -0.787 | -0.835 | -0.878 | -0.878 | -0.878 | -0.837 | -0.179 | 0.027 |
| τ = 0.80 | -0.784 | -0.784 | -0.784 | -0.806 | -0.806 | -0.812 | -0.867 | -0.113 | -0.113 |
| τ = 0.90 | -0.676 | -0.791 | -0.791 | -0.791 | -0.791 | -0.791 | -0.791 | -0.102 | -0.102 |
| GDP-Quantiles | τ = 0.10 | τ = 0.20 | τ = 0.30 | τ = 0.40 | τ = 0.50 | τ = 0.60 | τ = 0.70 | τ = 0.80 | τ = 0.90 |
| τ = 0.10 | -0.404 | -0.525 | -0.525 | -0.525 | -0.525 | -0.178 | -0.305 | -0.921 | -0.921 |
| τ = 0.20 | 0.065 | -1.450 | -1.512 | -1.619 | -1.619 | -0.404 | -0.108 | -0.284 | -0.284 |
| τ = 0.30 | 1.495 | -1.615 | -1.615 | -1.615 | -1.615 | -1.131 | -0.696 | -0.174 | -0.481 |
| τ = 0.40 | 1.653 | -0.930 | -1.033 | -1.033 | -1.084 | -1.102 | -1.007 | -0.603 | -0.603 |
| τ = 0.50 | 0.566 | -0.013 | 0.081 | -0.222 | -0.286 | -1.313 | -1.420 | -1.420 | -0.728 |
| τ = 0.60 | 0.215 | 0.193 | 0.193 | -0.086 | -0.086 | -0.800 | -0.800 | -0.938 | -1.224 |
| τ = 0.70 | 0.425 | 0.423 | 0.215 | 0.200 | -0.220 | -0.532 | -0.532 | -1.224 | -1.657 |
| τ = 0.80 | 0.565 | 0.565 | 0.300 | 0.300 | 0.117 | -0.563 | -0.563 | -1.657 | -1.657 |
| τ = 0.90 | 0.588 | 0.588 | 0.588 | 0.487 | 0.487 | -0.072 | -1.108 | -1.108 | -1.108 |
| Quantiles | Impact of POI on GDP | Impact of COR on GDP | Impact of GEF on GDP | ||||||
| Short | Medium | Long | Short | Medium | Long | Short | Medium | Long | |
| τ = 0.05 | 0.000 | -0.078 | -0.488 | 0.029 | -0.092 | -0.484 | -0.067 | -0.051 | -0.343 |
| τ = 0.10 | 0.015 | -0.055 | -0.489 | 0.016 | -0.063 | -0.484 | -0.067 | -0.022 | -0.339 |
| τ = 0.15 | 0.010 | -0.062 | -0.483 | 0.011 | -0.069 | -0.475 | -0.023 | -0.013 | -0.328 |
| τ = 0.20 | 0.010 | -0.032 | -0.494 | 0.006 | -0.037 | -0.494 | 0.004 | -0.070 | -0.328 |
| τ = 0.25 | -0.035 | -0.030 | -0.483 | -0.025 | -0.032 | -0.483 | 0.025 | -0.075 | -0.324 |
| τ = 0.30 | 0.078 | 0.066 | -0.516 | -0.006 | 0.075 | -0.506 | -0.004 | 0.077 | -0.339 |
| τ = 0.35 | -0.060 | 0.074 | -0.521 | 0.082 | 0.070 | -0.516 | 0.025 | 0.051 | -0.350 |
| τ = 0.40 | 0.214 | 0.078 | -0.527 | -0.046 | 0.063 | -0.521 | -0.015 | 0.061 | -0.363 |
| τ = 0.45 | -0.284 | -0.116 | -0.555 | 0.257 | -0.084 | -0.548 | 0.115 | -0.080 | -0.343 |
| τ = 0.50 | 0.009 | -0.150 | -0.561 | 0.002 | -0.120 | -0.554 | 0.024 | -0.112 | -0.403 |
| τ = 0.55 | 0.006 | -0.196 | -0.563 | 0.029 | -0.073 | -0.552 | 0.006 | -0.046 | -0.385 |
| τ = 0.60 | -0.023 | 0.063 | -0.474 | 0.020 | -0.230 | -0.473 | -0.029 | -0.027 | -0.431 |
| τ = 0.65 | -0.062 | 0.072 | -0.474 | -0.109 | -0.155 | -0.475 | -0.052 | -0.078 | -0.468 |
| τ = 0.70 | 0.025 | 0.105 | -0.445 | -0.138 | -0.212 | -0.445 | -0.066 | -0.109 | -0.230 |
| τ = 0.75 | -0.007 | 0.013 | -0.453 | -0.146 | -0.212 | -0.456 | 0.006 | 0.014 | -0.333 |
| τ = 0.80 | 0.018 | -0.028 | -0.463 | -0.019 | 0.028 | -0.468 | -0.026 | 0.024 | -0.260 |
| τ = 0.85 | 0.027 | 0.072 | -0.469 | -0.081 | -0.063 | -0.473 | -0.026 | -0.054 | 0.053 |
| τ = 0.90 | -0.011 | 0.036 | -0.434 | -0.021 | -0.072 | -0.440 | 0.036 | 0.029 | 0.059 |
| τ = 0.95 | 0.018 | 0.042 | -0.437 | 0.000 | -0.053 | -0.442 | 0.000 | 0.029 | 0.064 |