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Volatility Implications for Asset Returns Correlation Cover

Volatility Implications for Asset Returns Correlation

By:   
Open Access
|Nov 2024

Figures & Tables

Table 1.

Selected asset classes and data series and source description

Broad asset classesSelected asset classRepresentative ticker(s) or indexSample period and frequency
U.S. equitiesU.S. broad equityIndex: Wilshire 5000 Total Market Index, Close; Data series: WILL5000PR – FRED1970-12-31 to 1979-11-30 – monthly, 1979-12-03 to 2024-03-28 – daily
U.S. Large cap (S&P 500 index)Ticker: SPY - SPDR S&P 500 ETF Trust, Close; Data series: SPY – Yahoo Finance1980-01-02 to 2024-05-10 – daily
U.S. sectoral equitiesTickers: XLE, XLU, XLK, XLB, XLP, XLY, XLI, XLV, XLF - Select Sectors SPDR Funds, all Close; Data series: all – Yahoo Finance; IYR - iShares U.S. Real Estate ETF, all Close; Data series: all – Yahoo Finance Index: S&P Communication Services Select Sector Index, Close; Data series: ^SP500-50 – Yahoo FinanceXLE, XLU, XLK, XLB, XLP, XLY, XLI, XLV, XLF - 1998-12-22 to 2024-04-05 – daily; IYR - 2000-06-19 to 2024-04-05 – daily; ^SP500-50 - 1993-05-04 to 2024-04-05 – daily.
U.S. growth equitiesTicker: IUSG - iShares Core S&P U.S. Growth ETF, Close; Data series: IUSG - Yahoo Finance2000-07-28 to 2024-04-08 – daily
U.S. value equitiesTicker: IUSV - iShares Core S&P U.S. Value ETF, Close; Data series: IUSV – Yahoo Finance2000-08-04 to 2024-04-05 – daily
International equitiesDeveloped countries’ equities ex.-U.S.Ticker: VEA - Vanguard FTSE Developed Markets Index Fund ETF Shares, Close; Data series: VEA – Yahoo Finance2007-07-26 to 2024-04-05 – daily
EU equitiesTicker: EZU - iShares MSCI Eurozone ETF, Close; Data series: EZU – Yahoo Finance2000-07-31 to 2024-04-05 – daily
Japan equitiesTicker: EWJ - iShares MSCI Japan ETF, Close; Data Series: EWJ – Yahoo Finance1996-03-18 to 2024-04-05 – daily
Developing countries’ equities ex.-ChinaTicker: EMXC - iShares MSCI Emerging Markets ex China ETF, Close; Data Series: EMXC – Yahoo Finance2017-07-26 to 2024-04-05 – daily
Metals such as gold, silver, platinum and copperGoldIndex: LBMA Gold Price PM ($/ozt); Data Series: Global Gold price - Historical Data (1979-Present) – Kaggle1985-01-01 to 2023-10-06 - daily
SilverIndex: LBMA Silver Price ($/ozt); Data Series: Daily Silver prices (1968 – 2022) – Kaggle1968-01-02 to 2022-04-21 - daily
PlatinumIndex: Platinum London PM Fix ($/ozt); Data Series: Daily London Fix Prices 1990 – 2024 – Kaggle1990-04-02 to 2023-10-09 – daily
CopperIndex: FRED Global price of Copper ($/ton); Data Series: PCOPPUSDM – FRED1991-01-01 to 2024-02-01 – monthly
Oil, Energy, and Agriculture commodities – exposureOilTicker: DBO - Invesco DB Oil Fund, Close; Data Series: DBO – Yahoo Finance2007-01-05 to 2024-04-05 – daily
UraniumTicker: URA - Global X Uranium ETF, Close; Data Series: URA – Yahoo Finance2010-11-05 to 2024-04-05 – daily
Agriculture commoditiesTicker: DBA - Invesco DB Agriculture Fund, Close; Data Series: DBA – Yahoo Finance2007-01-05 to 2024-04-05 – daily
Alternative investment – exposureCryptocurrency – BitcoinTicker: GBTC - Grayscale Bitcoin Trust ETF (BTC), Close; Data Series: GBTC – Yahoo Finance2015-05-11 to 2024-04-08 – daily
Government bonds – exposureU.S. Long-term bondsTicker: TLT - iShares 20+ Year Treasury Bond ETF), Close; Data Series: TLT – Yahoo Finance2002-07-30 to 2024-04-19 – daily
U.S. Mid-term bondsTicker: IEF - iShares 7–10 Year Treasury Bond ETF, Close; Data Series: IEF – Yahoo Finance2002-07-30 to 2024-04-19 – daily
U.S. Inflation-linked bondsTicker: TIP - iShares TIPS Bond ETF, Close; Data Series: TIP – Yahoo Finance2003-12-05 to 2024-04-19 – daily
Developing countries’ government bondsTicker: EMB - iShares J.P. Morgan USD Emerging Markets Bond ETF, Close; Data Series: EMB – Yahoo Finance2007-12-19 to 2024-04-19 – daily
Corporate bonds - exposureU.S. Corporate bondsTicker: VCIT - Vanguard Intermediate-Term Corporate Bond Index Fund ETF Shares, Close; Data Series: VCIT – Yahoo Finance2009-11-23 to 2024-04-19 – daily
International corporate bondsTicker: CEMB - iShares J.P. Morgan EM Corporate Bond ETF, Close; Data Series: CEMB – Yahoo Finance2012-04-19 to 2024-04-19 – daily
Mixed bonds – exposureT-Bills, Corporate, MBS and Agency BondsTicker: BND - Vanguard Total Bond Market Index Fund, Close; Data Series: BND – Yahoo Finance2007-04-10 to 2024-04-19 – daily
Broad-based short-term investment gradeTicker: BSV - Vanguard Short-Term Bond Index Fund ETF Shares, Close; Data Series: BSV – Yahoo Finance2007-04-10 to 2024-04-19 – daily
Table 2.

Summary statistics of asset yearly rolling returns

CountMeanStdMinMax
BND4,0360.0280.050−0.1680.180
BSV4,0340.0200.029−0.0770.135
CEMB2,7700.0260.070−0.1870.294
DBA4,0910.0020.185−0.4700.642
DBO4,0910.0270.363−0.6461.374
EMB3,8590.0460.102−0.2570.644
EMXC1,4330.0410.199−0.3190.875
EWJ6,8090.0360.204−0.4340.854
EZU5,7070.0620.227−0.5910.814
GBTC1,9901.8353.404−0.89133.085
gold9,8540.0590.150−0.2920.709
IEF5,2180.0330.066−0.1810.205
IUSG5,7090.0920.192−0.5130.825
IUSV5,7030.0900.167−0.5080.797
IYR5,7360.1010.211−0.5921.250
PCOPPUSDM8,3730.0810.312−0.5811.486
platinum8,1470.0470.219−0.5430.978
silver10,4380.0450.303−0.7001.712
SPY10,9320.1030.163−0.4860.750
TIP4,8770.0340.057−0.1340.206
TLT5,2180.0450.130−0.3580.434
URA3,122−0.0350.381−0.6001.776
VCIT3,3730.0370.062−0.1820.211
VEA3,9510.0490.191−0.5250.787
WILL5000PR11,2820.1010.168−0.4880.817
XLB6,1110.0930.191−0.5451.017
XLE6,1110.1080.264−0.5951.166
XLF6,1110.0730.235−0.7211.507
XLI6,1110.0950.191−0.5550.995
XLK6,1110.1110.253−0.6380.878
XLP6,1110.0740.112−0.2990.452
XLU6,1110.0810.153−0.4630.504
XLV6,1110.0900.129−0.3370.557
XLY6,1110.1060.193−0.4951.003
^SP500-507,5320.0520.228−0.580.755

[i] Note: series named ‘gold’ are referring to returns of LBMA Gold Price PM ($/ozt), PCOPPUSDM – FRED Global price of copper ($/ton), platinum – Platinum London PM Fix ($/ozt), silver – LBMA Silver Price ($/ozt), WILL5000PR – Wilshire 5000 Total Market Index, and ^SP500-50 – S&P 500 Communication Services (Sector).

Table 3.

Rule of thumb for interpreting the size of a correlation coefficient

Size of correlationInterpretation
.90 to 1.00 (−.90 to −1.00)Very high positive (negative) correlation
.70 to .90 (−.70 to −.90)High positive (negative) correlation
.50 to .70 (−.50 to −.70)Moderate positive (negative) correlation
.30 to .50 (−.30 to −.50)Low positive (negative) correlation
.00 to .30 (.00 to −.30)Negligible correlation
Figure 1.

VIX – volatility index, 1990–2024

Figure 2.

Distribution of correlation intervals by asset return periods

Figure 3.

Different responses to crisis of the range of holding/correlation periods of the price of silver and the broad US stock index during the period of the global financial crisis, 2007–2012

Table 4.

1-year rolling volatility implications on annual rolling asset returns correlation, sample table of regression results.

Ticker PairTLT-XLUIEF-XLUDBO-XLUCEMB-XLYEMB-XLYGBTC-^SP500-50IEF-IYRIYR-TLTVEA-^SP500-50
R^20.260.250.200.220.220.250.150.150.19
Intercept0.810.79−0.31−0.29−0.23−0.100.690.66−0.05
Slope−0.03−0.030.020.030.030.03−0.03−0.030.02
P-value0.000.000.000.000.000.000.000.000.00
Standard Error0.0010.0010.0010.0010.0010.0010.0010.0010.001
Avg Corr VIX <= 200.420.410.000.150.150.280.330.300.27
Avg Corr VIX > 20−0.19−0.160.510.650.630.75−0.14−0.160.72
Avg Corr VIX > 30−0.32−0.330.590.720.730.78−0.39−0.380.84
Absolute difference at VIX > 20 and VIX <= 200.610.570.520.500.480.480.470.460.46
T-value−41.56−40.3531.4626.7432.3624.52−29.62−29.7629.73
Conf Int Lower−0.032−0.0310.0230.0300.0260.026−0.028−0.0280.023
Conf Int Upper−0.029−0.0280.0270.0350.0300.031−0.025−0.0250.026
Shapiro-Wilk Stat0.9600.9610.9530.9660.9620.8990.9230.9420.942
Shapiro-Wilk P-value0.0000.0000.0000.0000.0000.0000.0000.0000.000
Breusch-Pagan Stat36418915417836539149
Breusch-Pagan P-value0.0000.0000.0000.0000.0000.0000.0270.0000.000
Durbin-Watson Stat0.01580.01500.01240.01850.01460.02090.00820.00830.0112
Table 5.

Average absolute difference of average correlation during VIX>20 and VIX<20 per different periods

Asset class pair3-month6-month1-year2-year5-year
International equities-Alternative investment0.3010.2690.1250.160n/a
International equities-Government bonds0.1400.1090.1680.2020.125
International equities-Mixed bonds0.2430.0580.1470.2470.066
International equities-Corporate bonds0.2680.1550.2650.2130.096
International equities-Metals such as gold, silver, platinum and copper0.1190.0940.2200.1670.105
U.S. equities-International equities0.1120.1500.1230.1200.078
U.S. equities-Oil. Energy. and Agriculture commodities0.1570.1370.2150.1120.181
U.S. equities-Alternative investment0.2290.1860.2290.165n/a
U.S. equities-Government bonds0.1430.1530.2160.1690.195
U.S. equities-Mixed bonds0.1730.1190.1440.2030.138
U.S. equities-Corporate bonds0.2030.1980.2180.1690.075
U.S. equities-Metals such as gold, silver, platinum and copper0.0710.1110.1770.2030.323
Oil, Energy, and Agriculture commodities - International equities0.1100.1370.2070.1180.103
Oil, Energy, and Agriculture commodities - Alternative investment0.2570.350.2240.374n/a
Oil, Energy, and Agriculture commodities - Government bonds0.1490.0860.1230.1230.110
Oil, Energy, and Agriculture commodities - Mixed bonds0.1350.040.1300.0870.164
Oil, Energy, and Agriculture commodities - Corporate bonds0.1670.0590.1290.1930.168
Oil, Energy, and Agriculture commodities - Metals such as gold, silver, platinum and copper0.1290.1460.1220.1640.057
Alternative investment - Government bonds0.1810.2270.1490.227n/a
Alternative investment - Mixed bonds0.0420.2720.0620.353n/a
Alternative investment - Corporate bonds0.1580.0870.1670.168n/a
Alternative investment - Metals such as gold, silver, platinum and copper0.1830.1800.2340.174n/a
Government bonds-Mixed bonds0.0720.0580.1280.1250.034
Government bonds-Corporate bonds0.0840.0660.1130.1190.043
Government bonds-Metals such as gold, silver, platinum and copper0.0950.1160.160.0930.261
Mixed bonds-Corporate bonds0.0840.0510.0720.1540.030
Mixed bonds-Metals such as gold, silver, platinum and copper0.0840.0670.0950.1730.050
Corporate bonds-Metals such as gold, silver, platinum and copper0.1700.0850.1060.0900.187
The absolute value of the correlation difference at VIX >20 and at VIX <= 20, the average value of the difference across all asset pairs0.1390.1320.1730.1600.160
Figure 4.

Average correlation of the rolling annual return of individual pairs of assets with a volatility index greater than 20 and less than 20

Table 6.

The number of transition pairs with a change in the sign of correlation and the strength of correlation for each rolling period

3-month6-month1 year2 years5 years
x=pos, y=pos341356364308242
x=pos, y=neg1115211767
x=neg, y=pos643339532
x=neg, y=neg5163438992
Share of asset pairs which do not change the sign of the correlation16%10%13%15%17%
x<0.3; x>−0.3; y>−0.3; y<0.3 – weak correlation during both periods238196126114140
x<0.3; x>−0.3; y<−0.3; y>0.3 – weak correlation during VIX<20, stronger correlation during VIX>2082901047542
x>0.3; x<−0.3; y>−0.3; y<0.3 – stronger correlation during VIX<20, weak correlation during VIX>201219314056
x>0.3; x<−0.3; y<−0.3; y>0.3 – stronger correlation during both periods135162206238165
Share of asset pairs which changed correlation both from weak to stronger and from stronger to weak20%23%29%25%24%
Table 7.

Regression results for 1-year rolling correlation of 1-year rolling returns, asset pairs with difference >0.30 of average correlation between different volatility regimes

No.Ticker PairR^2Intcpt.SlopeP-valueStand. Err.Avg Corr VIX <=20Avg Corr VIX > 20Avg Corr VIX > 30Abs. difference at VIX > 20 and VIX <=20T-val.Conf Int LowerConf Int UpperShapiro-Wilk StatShapiro-Wilk P-valueBreusch-Pagan StatBreusch-Pagan P-valueDurbin-Watson Stat
1TLT-XLU0.260.81−0.030.000.0010.42−0.19−0.320.61−41.56−0.032−0.0290.9600.0003640.0000.0158
2IEF-XLU0.250.79−0.030.000.0010.41−0.16−0.330.57−40.35−0.031−0.0280.9610.0001890.0000.0150
3DBO-XLU0.20−0.310.020.000.0010.000.510.590.5231.460.0230.0270.9530.000150.0000.0124
4CEMB-XLY0.22−0.290.030.000.0010.150.650.720.5026.740.0300.0350.9660.000410.0000.0185
5EMB-XLY0.22−0.230.030.000.0010.150.630.730.4832.360.0260.0300.9620.000780.0000.0146
6GBTC-^SP500-500.25−0.100.030.000.0010.280.750.780.4824.520.0260.0310.8990.000360.0000.0209
7IEF-IYR0.150.69−0.030.000.0010.33−0.14−0.390.47−29.62−0.028−0.0250.9230.00050.0270.0082
8IYR-TLT0.150.66−0.030.000.0010.30−0.16−0.380.46−29.76−0.028−0.0250.9420.000390.0000.0083
9VEA-^SP500-500.19−0.050.020.000.0010.270.720.840.4629.730.0230.0260.9420.0001490.0000.0112
10CEMB-EWJ0.15−0.020.030.000.0010.320.770.800.4521.540.0240.0280.9270.00020.2010.0121
11DBO-XLP0.21−0.210.020.000.0010.100.550.650.4532.370.0230.0260.9610.000190.0000.0130
12GBTC-URA0.27−0.240.030.000.0010.140.580.730.4425.620.0260.0310.9800.000460.0000.0232
13BSV-XLU0.100.57−0.020.000.0010.430.000.040.43−21.10−0.017−0.0140.9760.0007090.0000.0058
14VCIT-XLU0.160.82−0.020.000.0010.510.090.140.42−24.45−0.025−0.0210.9630.0009760.0000.0129
15PCOPPUSDM-XLV0.23−0.220.030.000.0010.120.540.660.4242.070.0250.0270.9550.0001760.0000.0136
16GBTC-silver0.14−0.030.020.000.0010.160.570.610.4114.610.0140.0190.9110.00040.0480.0104
17PCOPPUSDM-WILL5000PR0.18−0.260.030.000.0010.140.550.700.4141.070.0270.0300.9300.0002320.0000.0092
18GBTC-PCOPPUSDM0.180.010.020.000.0010.300.700.760.4019.530.0210.0250.9190.000310.0000.0139
19BND-XLU0.070.58−0.010.000.0010.500.100.220.40−16.83−0.013−0.0110.9710.0008520.0000.0039
20CEMB-EZU0.100.100.020.000.0010.380.780.860.4017.270.0200.0250.9120.0001260.0000.0079
21GBTC-XLY0.280.080.020.000.0010.370.750.790.3926.360.0210.0240.9170.000440.0000.0245
22DBA-XLV0.20−0.230.020.000.0010.040.430.530.3830.870.0190.0220.9820.000390.0000.0119
23CEMB-IUSG0.160.050.020.000.0010.360.740.770.3821.920.0210.0250.8990.000100.0020.0125
24DBA-XLP0.18−0.190.020.000.0010.090.470.580.3829.480.0200.0230.9660.000140.0000.0109
25URA-^SP500-500.22−0.060.030.000.0010.290.670.770.3828.820.0240.0270.9620.00080.0040.0190
26EMB-EWJ0.10−0.010.020.000.0010.240.610.640.3820.570.0170.0210.9310.000650.0000.0061
27BND-IYR0.070.68−0.010.000.0010.540.170.150.37−16.58−0.016−0.0120.9130.0003610.0000.0037
28BSV-IYR0.100.65−0.020.000.0010.490.120.000.37−20.49−0.017−0.0140.9460.0004790.0000.0055
29IUSG-PCOPPUSDM0.18−0.040.020.000.0010.280.650.750.3734.900.0220.0240.9120.0001400.0000.0100
30IYR-URA0.180.080.020.000.0010.360.720.790.3625.310.0200.0230.9480.00000.8920.0144
31VCIT-XLY0.08−0.220.020.000.0010.040.400.300.3616.520.0170.0220.9620.00000.5210.0061
32EZU-PCOPPUSDM0.160.080.020.000.0010.350.710.800.3631.800.0190.0220.9090.0001540.0000.0084
33DBO-IYR0.14−0.090.020.000.0010.180.540.630.3625.490.0190.0220.9300.000350.0000.0083
34EZU-^SP500-500.130.000.020.000.0010.290.650.770.3629.130.0200.0230.9370.0002510.0000.0069
35TLT-XLE0.120.04−0.020.000.001−0.19−0.55−0.650.36−26.26−0.019−0.0160.9560.00010.2990.0065
36DBA-EWJ0.13−0.230.020.000.0010.060.420.550.3624.490.0200.0230.9300.0001100.0000.0075
37PCOPPUSDM-XLY0.17−0.250.030.000.0010.120.470.670.3535.230.0240.0270.9380.000330.0000.0096
38EWJ-TIP0.09−0.400.020.000.001−0.160.200.250.3521.030.0170.0210.9370.000670.0000.0045
39silver-XLV0.20−0.400.020.000.001−0.100.260.410.3536.310.0210.0230.9670.000430.0000.0107
40DBA-XLY0.16−0.270.020.000.0010.040.400.530.3527.120.0200.0240.9490.000470.0000.0092
41PCOPPUSDM-SPY0.15−0.200.030.000.0010.170.520.660.3537.520.0240.0270.9220.0001680.0000.0077
42CEMB-VEA0.110.220.020.000.0010.470.820.860.3517.800.0170.0220.8880.000970.0000.0084
43EWJ-URA0.19−0.130.030.000.0010.250.590.730.3526.140.0250.0290.9500.00040.0470.0157
44EMB-EZU0.090.090.020.000.0010.320.670.700.3519.360.0160.0200.9140.0001220.0000.0054
45TLT-XLP0.120.35−0.020.000.0010.05−0.29−0.450.35−26.44−0.023−0.0200.9260.00090.0030.0065
46EZU-silver0.17−0.070.020.000.0010.190.530.610.3431.460.0180.0200.9490.000380.0000.0088
47DBA-VCIT0.100.62−0.020.000.0010.340.00−0.270.34−18.95−0.023−0.0180.9380.000570.0000.0081
48EWJ-IYR0.17−0.100.020.000.0010.190.530.620.3433.590.0200.0220.9550.00080.0040.0091
49silver-VEA0.20−0.030.020.000.0010.210.550.690.3428.220.0170.0190.9520.0001460.0000.0114
50EMB-IUSG0.130.060.020.000.0010.310.650.700.3423.000.0170.0200.9080.000540.0000.0075
51TIP-XLY0.09−0.330.020.000.001−0.100.240.320.3421.670.0170.0200.9640.000650.0000.0048
52silver-TLT0.110.32−0.020.000.0010.06−0.28−0.520.33−23.31−0.021−0.0180.9710.0001950.0000.0055
53IEF-XLP0.130.39−0.020.000.0010.09−0.24−0.440.33−26.77−0.023−0.0200.9480.000180.0000.0067
54IUSG-silver0.15−0.180.020.000.0010.080.410.500.3329.900.0180.0210.9710.00020.1690.0078
55DBA-TLT0.100.23−0.020.000.001−0.01−0.34−0.530.33−20.89−0.020−0.0170.9670.00000.7840.0056
56DBA-IUSG0.17−0.070.020.000.0010.190.520.620.3328.490.0180.0200.9570.00010.3510.0102
57TLT-XLV0.120.25−0.020.000.001−0.04−0.36−0.490.33−26.59−0.022−0.0190.9290.000390.0000.0067
58URA-XLY0.18−0.030.030.000.0010.340.670.780.3225.420.0240.0280.9230.000220.0000.0149
59GBTC-WILL5000PR0.230.180.020.000.0010.430.750.800.3223.250.0180.0210.8900.00050.0210.0189
60platinum-XLV0.15−0.220.020.000.0010.070.390.460.3232.130.0190.0220.9510.0002720.0000.0082
61EMB-XLF0.120.040.020.000.0010.300.620.700.3222.750.0170.0210.9440.0002340.0000.0075
62IUSV-PCOPPUSDM0.140.040.020.000.0010.320.630.720.3130.190.0190.0210.9060.000180.0000.0077
63IYR-VCIT0.140.94−0.020.000.0010.730.420.370.31−22.93−0.018−0.0150.8970.0002890.0000.0114
64GBTC-IUSV0.170.060.020.000.0010.340.650.710.3119.180.0190.0230.8620.000460.0000.0128
65TLT-^SP500-500.090.40−0.020.000.0010.11−0.19−0.460.31−22.15−0.022−0.0180.9600.000140.0000.0047
66EWJ-XLU0.13−0.400.020.000.001−0.090.220.410.3029.870.0200.0230.9780.0001920.0000.0069
67EMB-XLI0.080.180.020.000.0010.390.690.730.3018.230.0140.0180.8820.0001960.0000.0048
68CEMB-WILL5000PR0.110.240.020.000.0010.470.780.810.3018.150.0160.0200.8890.000460.0000.0087
69EMB-VEA0.080.200.020.000.0010.400.700.720.3018.210.0140.0170.9050.000790.0000.0049
70EMB-XLV0.14−0.050.020.000.0010.210.510.670.3024.530.0170.0200.9620.0001980.0000.0086
71EZU-TIP0.08−0.280.020.000.001−0.070.230.310.3019.540.0150.0180.9580.000600.0000.0040
72IUSG-TIP0.06−0.190.020.000.0010.000.300.330.3017.900.0140.0170.9530.000970.0000.0034
73DBA-SPY0.140.030.020.000.0010.260.560.630.3024.940.0160.0180.9280.000310.0000.0080
74IYR-PCOPPUSDM0.16−0.140.020.000.0010.180.470.640.3032.040.0200.0230.9550.00040.0580.0085
75CEMB-XLI0.090.280.020.000.0010.500.800.840.3016.330.0150.0190.8450.000640.0000.0071
76URA-XLF0.190.120.020.000.0010.430.720.820.3026.020.0200.0240.9360.00030.0700.0156
DOI: https://doi.org/10.2478/ceej-2024-0027 | Journal eISSN: 2543-6821 | Journal ISSN: 2544-9001
Language: English
Page range: 424 - 446
Published on: Nov 23, 2024
Published by: Faculty of Economic Sciences, University of Warsaw
In partnership with: Paradigm Publishing Services
JEL:

© 2024 Illia Ivanov, published by Faculty of Economic Sciences, University of Warsaw
This work is licensed under the Creative Commons Attribution 4.0 License.