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Does the early release of retirement savings prolong labor market participation for workers approaching retirement? Evidence from Australia's “Transition to Retirement Income Streams” program Cover

Does the early release of retirement savings prolong labor market participation for workers approaching retirement? Evidence from Australia's “Transition to Retirement Income Streams” program

Open Access
|Nov 2022

Figures & Tables

Table 1

Data sources

WorkedDid not work
FiledIncome tax return dataIncome tax return data
Did not filePAYG payment summary data (for salary and wage payments only)Residual population calculated from ABS estimates

[i] ABS, Australian Bureau of Statistics; PAYG, Pay-As-You-Go.

Table 2

“Net income from working Indicator 2”: adjusted Australian Taxation Office definition

Net income from working
=Total gross salary and wage payments(1)
+Income from allowances, earnings, tips, director's fees, etc.(2)
+Attributed personal services income(3)
+Total reportable fringe benefits (RFB) amounts (if RFB ≥ RFB threshold)(4)
Work-related car expenses(5)
Work-related travel expenses(6)
Work-related clothing expenses(7)
Work-related self-education expenses(8)
Other work-related expenses(9)
Low-value pool deductiona(10)
+Net income from working (Appendix section)b(11)
+Total employer superannuation contributions(12)

a Low-value pool deductions refer to “low-cost” and “low-value” assets used in the course of generating income. These are assets costing <$1,000, which can be depreciated over multiple tax lodgment years.

b NIFW (Appendix section) refers to business and partnership income that is derived from working.

Figure 1

Derived employment rates for individuals aged 56 years.

NIFW, net income from working; SW, salary and wage.

Figure 2

“TRIS-like-behavior”, using NIFW Indicator 2 TRIS rule.

NIFW, net income from working; TRIS, Transition to Retirement Income Streams.

Figure 3

Reported SMSF TRIS, males and females pooled.

SMSF, self-managed superannuation funds; TRIS, Transition to Retirement Income Streams.

Table 3

Labor supply rates in periods before and after the introduction of TRIS

Pre-TRIS 2004–05
(1)
TRIS 2005–06
(2)
Difference (2 – 1)
(3)
Difference-in-difference
(4)
Males
ANIFW Indicator 2
Treatment (age: 56 years) [249,728]0.7977 (0.0011)0.8080 (0.0011)0.0102*** (0.0016)
Control (age: 54 years) [256,949]0.8317 (0.001)0.8432 (0.001)0.0115*** (0.0015)−0.0013 (0.0022)
BNIFW Indicator 3
Treatment (age: 56 years) [249,728]0.6729 (0.0013)0.6867 (0.0013)0.0138*** (0.0019)
Control (age: 54 years) [256,949]0.7111 (0.0013)0.7234 (0.0012)0.0124*** (0.0018)0.0014 (0.0026)
CSalary and wage indicator
Treatment (age: 56 years) [249,728]0.6557 (0.0014)0.6711 (0.0013)0.0154*** (0.0019)
Control (age: 54 years) [256,949]0.6962 (0.0013)0.7089 (0.0013)0.0127*** (0.0018)0.0027 (0.0026)
Females
DNIFW Indicator 2
Treatment (age: 56 years) [250,487]0.6603 (0.0013)0.6778 (0.0013)0.0175*** (0.0019)
Control (age: 54 years) [258,953]0.7168 (0.0013)0.7362 (0.0012)0.0194*** (0.0018)−0.0019 (0.0026)
ENIFW Indicator 3
Treatment (age: 56 years) [250,487]0.5873 (0.0014)0.6060 (0.0014)0.0186*** (0.002)
Control (age: 54 years) [258,953]0.6476 (0.0013)0.6687 (0.0013)0.0212*** (0.0019)−0.0025 (0.0027)
FSalary and wage indicator
Treatment (age: 56 years) [250,487]0.5765 (0.0014)0.5959 (0.0014)0.0194*** (0.002)
Control (age: 54 years) [258,953]0.6387 (0.0013)0.6597 (0.0013)0.0211*** (0.0019)−0.0017 (0.0027)

[i] Notes: Labor supply equals one if the specific NIFW measure has a dollar value that does not equal zero. Sample size is presented in square brackets, and robust standard errors are in parentheses.

[ii] ***, **, and * denote statistical significance at the 0.01, 0.05, and 0.1 levels, respectively.

[iii] NIFW, net income from working; TRIS, Transition to Retirement Income Streams.

Table 4

TRIS effects on “labor supply” and “earnings” (D-i-D coefficients)

2004–05 vs 2005–06
(1)
2004–05 vs 2006–07
(2)
ITR, PAYG, and ABS estimates54 years vs 56 years54 years vs 56 years
Labor supplyMales
NIFW 2 D-i-D (TRIS · Age)−0.0013[0.0022]0.0052**[0.0021]
NIFW 3 D-i-D (TRIS · Age)0.0014[0.0026]0.0102***[0.0026]
Salary and wage D-i-D (TRIS · Age)0.0027[0.0026]0.0101***[0.0026]
Females
NIFW 2 D-i-D (TRIS · Age)−0.0019[0.0026]−0.0008[0.0025]
NIFW 3 D-i-D (TRIS · Age)−0.0025[0.0027]0.0001[0.0027]
Salary and wage D-i-D (TRIS · Age)−0.0017[0.0027]0.0003[0.0027]
ITR and PAYG data54 years vs 56 years54 years vs 56 years
Earned incomeMales
NIFW 2 D-i-D (TRIS · Age)0.0173**[0.0073]0.0244***[0.0073]
NIFW 3 D-i-D (TRIS · Age)0.0018[0.0079]0.0161**[0.0079]
Salary and wage D-i-D (TRIS · Age)0.0021[0.0080]0.0179**[0.0080]
Females
NIFW 2 D-i-D (TRIS · Age)−0.0080[0.0083]0.0012[0.0082]
NIFW 3 D-i-D (TRIS · Age)−0.0175**[0.0084]−0.0099[0.0082]
Salary and wage D-i-D (TRIS · Age)−0.0190**[0.0084]−0.0084[0.0083]
2006–07 vs 2007–082006–07 vs 2008–09
ITR, PAYG, and ABS estimates59 years vs 61 years59 years vs 61 years
Labor supplyMales
NIFW 2 D-i-D (TRIS · Age)0.0247***[0.0026]0.0110***[0.0026]
NIFW 3 D-i-D (TRIS · Age)0.0253***[0.0028]0.0136***[0.0028]
Salary and wage D-i-D (TRIS · Age)0.0238***[0.0028]0.0115***[0.0029]
Females
NIFW 2 D-i-D (TRIS · Age)0.0134***[0.0029]0.0058**[0.0029]
NIFW 3 D-i-D (TRIS · Age)0.0113***[0.0029]0.0058**[0.0029]
Salary and wage D-i-D (TRIS · Age)0.0113***[0.0029]0.0050*[0.0029]
ITR and PAYG data59 years vs 61 years59 years vs 61 years
Earned incomeMales
NIFW 2 D-i-D (TRIS · Age)0.0024[0.0088]0.0020[0.0092]
NIFW 3 D-i-D (TRIS · Age)−0.0149[0.0093]−0.0133[0.0097]
Salary and wage D-i-D (TRIS · Age)−0.0166[0.0102]−0.0110[0.0099]
Females
NIFW 2 D-i-D (TRIS · Age)0.0074[0.0112]0.0137[0.0111]
NIFW 3 D-i-D (TRIS · Age)−0.0229**[0.0113]−0.0197*[0.0111]
Salary and wage D-i-D (TRIS · Age)−0.0263**[0.0114]−0.0217*[0.0111]

[i] Notes: Robust standard errors are presented in brackets.

[ii] ***, **, and * denote statistical significance at the 0.01, 0.05, and 0.1 levels, respectively.

[iii] ABS, Australian Bureau of Statistics; D-i-D, difference-in-differences; ITR, income tax return; NIFW, net income from working; PAYG, Pay-As-You-Go; TRIS, Transition to Retirement Income Streams.

Figure 4

Rolling D-i-D estimates – 54 years vs 56 years of age, males.

D-i-D, difference-in-differences; NIFW, net income from working; SW, salary and wage.

Figure 5

Rolling D-i-D estimates – 54 years vs 56 years of age, females.

D-i-D, difference-in-differences; NIFW, net income from working; SW, salary and wage.

Figure 6

Trends in employment rates (NIFW Indicator 2).

NIFW, net income from working.

Table A1

TRIS measures versus APRA statistics, 55–59 year age range, 2014–151

APRA-regulated fundsSMSFs
FemaleMaleTotalFemaleMaleTotal
Count of TRIS recipients (’000s)
ANIFW Indicator 23035657714
BNIFW Indicator 32731586511
CSW indicator2630565510
DAPRA 55–59212647nanana
EAPRA 60–64405292nanana
FAPRA 65–69347nanana
Total TRIS payments ($ million)
GNIFW Indicator 2342498840125182307
HNIFW Indicator 329843273098140237
ISW indicator28240869087122208
JAPRA 55–59204325529nanana
KAPRA 60–644388011,239nanana
LAPRA 65–693872110nanana

1 There is a difference in the reported unit between the APRA and derived TRIS estimates. The APRA statistics are on an account basis, whereas the derived TRIS estimates are on an individual basis.

APRA, Australian Prudential Regulation Authority; NIFW, net income from working; SMSF, self-managed superannuation funds; SW, salary and wage; TRIS, Transition to Retirement Income Streams.

Table A2

Hypothetical TRIS use cases in 2005–06

Intended use: reducing labor ($ 000s)Moderate use: bolstering income ($ 000s)Aggressive use: tax planning ($ 000s)Notes
Benchmark
AEarnings from work80.0100.0140.0
BIncome tax on earnings21.930.649.42004–05 schedule
CPosttax earnings58.169.590.7=A – B
DEmployer contributions7.29.012.6=A*0.09a
ESalary-sacrificed contributions0.00.00.0
FTax on contributions1.11.41.9=(D+E)*0.15
Using TRIS
HEarnings from work56.0100.00.0
ITRIS19.125.035.0=R*0.1b
JAssessable income75.1125.035.0=H+I
KTax on earnings19.842.86.42004–05 schedule
LTRIS tax offset2.93.85.3=H*0.15
MTax minus TRIS offset17.039.01.1=K+L
NPosttax earnings58.186.033.9=J – M
OEmployer contributions5.09.012.6=H*.09a
PSalary-sacrificed contributions0.00.0140.0
QTax on contributions0.81.422.9=O+P*0.15
RSuperannuation balance200.0250.0350.0A*2.5c
Difference
SAfter-tax earnings0.016.6−56.8=N – C
TTax on income−4.98.5−48.2=M – B
USuper contributions−2.20.0140.0=O+P – D
VTax on contributions−0.30.021.0=Q – F
WTax paid−5.38.5−27.2=U+W

a Assumed to be at the superannuation guarantee rate of 9.0% in 2005–06.

b TRIS amounts are assumed to be at the maximum rates of 10%.

c Superannuation balance is assumed to be 2.5 times the earnings from work.

TRIS, Transition to Retirement Income Streams.

Table A3

Summary statistics before and after the introduction of TRIS, males

Control periodTreatment 1Treatment 2
2004–052005–062006–07
MeanStd. dev.MeanStd. dev.MeanStd. dev.
ITR, PAYG, plus ABS estimates
  Income year2004–050.002005–060.002006–070.00
  Age at June 3054.981.0054.991.0054.981.00
Employment rates
  NIFW Indicator 20.820.390.830.380.830.38
  NIFW Indicator 30.690.460.710.460.710.45
  SW indicator0.680.470.690.460.700.46
Earned income
  NIFW Indicator 2 ($)56,41974,44060,31192,30164,77193,301
  NIFW Indicator 3 ($)57,69763,97061,60287,30765,95283,799
  SW indicator ($)57,90860,29861,92882,8356635081,510
Observations (number)251,666na255,011na258,715na
ITR observations only
  Income year2004–050.002005–060.002006–070.00
  Age at June 3054.981.0054.981.0054.971.00
Employment rates
  NIFW Indicator 20.930.250.940.250.940.24
  NIFW Indicator 30.790.410.800.400.800.40
  SW indicator0.770.420.780.420.790.41
Earned income
  NIFW Indicator 2 ($)57,09975,08061,02393,19365,53694,171
  NIFW Indicator 3 ($)58,53964,49662,47788,24966,88184,624
  SW indicator ($)58,77760,75162,83283,70667,31182,302
Controls
  Reported spouse0.590.490.620.480.620.48
  Self-prepared tax return0.200.400.200.400.200.40
  Business and PSI income0.110.320.110.320.120.33
  Partnership and trust income0.210.410.200.400.200.40
  Dividend income0.390.490.370.480.370.48
  Rental income0.210.410.210.410.220.41
Remoteness
  Major cities0.680.470.680.470.670.47
  Inner regional0.200.400.210.400.210.41
  Outer regional0.090.290.090.290.090.29
  Remote and very remote0.020.130.020.130.020.13
  Not available0.010.090.010.100.010.11
Observations (number)214,771na219,504na222,946na

[i] Note: The Earned income measures show the mean and std. dev. for working individuals only. The number of individuals who have Earned income in a given year can be calculated by multiplying the relevant “Participation measure” by the number of observations.

[ii] ABS, Australian Bureau of Statistics; ITR, income tax return; na, not available; NIFW, net income from working; PAYG, Pay-As-You-Go; PSI, personal services income; Std. dev., standard deviation; SW, salary and wage; TRIS, Transition to Retirement Income Streams.

Table A4

Summary statistics before and after the introduction of TRIS, females

Control periodTreatment 1Treatment 2
2004–052005–062006–07
MeanStd. dev.MeanStd. dev.MeanStd. dev.
ITR, PAYG, plus ABS estimates
  Income year2004–050.002005–060.002006–070.00
  Age at June 3054.981.0054.991.0054.981.00
Employment rates
  NIFW Indicator 20.690.460.710.460.720.45
  NIFW Indicator 30.620.490.640.480.660.47
  SW indicator0.610.490.630.480.650.48
Earned income
  NIFW Indicator 2 ($)35,97129,20538,55732,59941,41236,773
  NIFW Indicator 3 ($)36,61627,72039,23730,70341,91533,900
  SW indicator ($)36,25126,71338,86129,80741,38532,733
Observations (number)252,876na256,564na261,864na
ITR observations only
  Income year2004–050.002005–060.002006–070.00
  Age at June 3054.961.0054.971.0054.961.00
Employment rates
  NIFW Indicator 20.880.320.890.310.900.30
  NIFW Indicator 30.790.410.800.400.820.39
  SW indicator0.780.420.790.410.800.40
Earned income
  NIFW Indicator 2 ($)36,35329,21335,69931,47341,81836,853
  NIFW Indicator 3 ($)37,06027,67939,69630,70542,38033,909
  SW indicator ($)36,69226,64939,31729,79041,83832,729
Controls
  Reported spouse0.510.500.560.500.560.50
  Self-prepared tax return0.230.420.230.420.240.43
  Business and PSI income0.050.220.050.220.060.24
  Partnership and trust income0.260.440.250.430.240.42
  Dividend income0.400.490.380.490.370.48
  Rental income0.200.400.200.400.210.40
Remoteness
  Major cities0.690.460.690.460.690.46
  Inner regional0.200.400.200.400.200.40
  Outer regional0.080.280.080.280.080.28
  Remote and very remote0.010.120.010.120.010.12
  Not available0.010.080.010.090.010.10
Observations (number)192,587na199,174na206,331na

[i] Note: The Earned income measures show the mean and std. dev. for working individuals only. The number of individuals that have Earned income in a given year can be calculated by multiplying the relevant “Participation measure” by the number of observations.

[ii] ABS, Australian Bureau of Statistics; ITR, income tax return; na, not available; NIFW, net income from working; PAYG, Pay-As-You-Go; PSI, personal services income; Std. dev., standard deviation; SW, salary and wage; TRIS, Transition to Retirement Income Streams.

Table A5

TRIS adoption – descriptive analysis, males

Without controlsPlus ageAdditional controls
(1)(2)(3)
Income tax return data only
Intercept0.0096***[0.0001]−0.0255***[0.0001]−0.0854***[0.0005]
D20060.0008***[0.0001]0.0003***[0.0001]−0.0000[0.0001]
D20070.0027***[0.0001]0.0025***[0.0001]0.0021***[0.0001]
D20080.0212***[0.0002]0.0211***[0.0002]0.0208***[0.0002]
D20090.0320***[0.0002]0.0320***[0.0002]0.0322***[0.0002]
D20100.0376***[0.0003]0.0378***[0.0003]0.0363***[0.0003]
D20110.0398***[0.0003]0.0400***[0.0003]0.0382***[0.0003]
D20120.0412***[0.0003]0.0415***[0.0003]0.0396***[0.0003]
D20130.0397***[0.0003]0.0401***[0.0003]0.0373***[0.0003]
D20140.0388***[0.0003]0.0392***[0.0003]0.0365***[0.0003]
D20150.0395***[0.0003]0.0398***[0.0003]0.0380***[0.0003]
Age at June 30
Age 54 years0.0005***[0.0000]0.0003***[0.0000]
Age 55 years0.0219***[0.0001]0.0215***[0.0001]
Age 56 years0.0433***[0.0002]0.0427***[0.0002]
Age 57 years0.0563***[0.0002]0.0557***[0.0002]
Age 58 years0.0660***[0.0002]0.0654***[0.0002]
Age 59 years0.0672***[0.0002]0.0666***[0.0002]
Additional controls
Log(Taxable income)0.0046***[0.0000]
Negative taxable income0.0463***[0.0006]
Self-prepared return−0.0012***[0.0003]
Reported partner−0.0083***[0.0002]
PSI income−0.0022***[0.0003]
Business and partnership0.0046***[0.0003]
income
Dividend income0.0168***[0.0002]
Rental income0.0062***[0.0003]
Remoteness
  Inner regional0.0022***[0.0003]
  Outer regional−0.0078***[0.0004]
  Remote and very−0.0189***[0.0006]
  remote
  Not available−0.0133***[0.0005]
Observations8,809,8358,809,8358,809,835
R-squared0.00740.02800.0346

[i] Notes: Robust standard errors clustered at the individual level are presented in brackets.

[ii] ***, **, and * denote statistical significance at the 0.01, 0.05, and 0.1 levels, respectively.

[iii] PSI, personal services income; TRIS, Transition to Retirement Income Streams.

Table A6

TRIS adoption – descriptive analysis, females

Without controlsPlus ageAdditional controls
(1)(2)(3)
Income tax return data only
Intercept0.0051***[0.0001]−0.0228***[0.0001]−0.0728***[0.0004]
D20060.0006***[0.0001]0.0003***[0.0001]0.0005***[0.0001]
D20070.0017***[0.0002]0.0015***[0.0001]0.0017***[0.0001]
D20080.0170***[0.0002]0.0169***[0.0002]0.0172***[0.0002]
D20090.0244***[0.0002]0.0243***[0.0002]0.0257***[0.0002]
D20100.0302***[0.0002]0.0301***[0.0002]0.0299***[0.0002]
D20110.0335***[0.0002]0.0334***[0.0002]0.0330***[0.0002]
D20120.0366***[0.0002]0.0365***[0.0002]0.0356***[0.0002]
D20130.0377***[0.0002]0.0376***[0.0002]0.0369***[0.0002]
D20140.0388***[0.0002]0.0386***[0.0002]0.0379***[0.0002]
D20150.0401***[0.0002]0.0399***[0.0002]0.0400***[0.0003]
Age at June 30
Age 54 years0.0003***[0.0000]0.0002***[0.0000]
Age 55 years0.0186***[0.0001]0.0181***[0.0001]
Age 56 years0.0361***[0.0002]0.0355***[0.0002]
Age 57 years0.0459***[0.0002]0.0454***[0.0002]
Age 58 years0.0531***[0.0002]0.0525***[0.0002]
Age 59 years0.0529***[0.0003]0.0524***[0.0002]
Additional controls
Log(Taxable income)0.0046***[0.0000]
Negative taxable income0.0480***[0.0006]
Self-prepared return−0.0067***[0.0002]
Reported partner−0.0045***[0.0002]
PSI income0.0017***[0.0004]
Business and partnership0.0107***[0.0003]
income
Dividend income0.0135***[0.0002]
Rental income0.0053***[0.0003]
Remoteness
  Inner regional0.0008**[0.0003]
  Outer regional−0.0063***[0.0004]
  Remote and very−0.0156***[0.0006]
  remote
  Not available−0.0095***[0.0004]
Observations8,182,6898,182,6898,182,689
R-squared0.00790.02420.0311

[i] Notes: Robust standard errors clustered at the individual level are presented in brackets.

[ii] ***, **, and * denote statistical significance at the 0.01, 0.05, and 0.1 levels, respectively.

[iii] PSI, personal services income; TRIS, Transition to Retirement Income Streams.

Table A7

TRIS effects on “labor supply” and “earnings” (double age grouping D-i-D coefficients)

2004–05 vs 2005–062004–05 vs 2006–07
(1)(2)
ITR, PAYG, and ABS estimates53–54 vs 56–5753–54 vs 56–57
Labor supplyMales
NIFW Indicator 2 D-i-D (TRIS · Age)0.0100***[0.0015]0.0144***[0.0015]
NIFW Indicator 3 D-i-D (TRIS · Age)0.0116***[0.0018]0.0178***[0.0018]
SW indicator D-i-D (TRIS · Age)0.0125***[0.0018]0.0185***[0.0018]
Females
NIFW Indicator 2 D-i-D (TRIS · Age)0.0062***[0.0018]0.0099***[0.0018]
NIFW Indicator 3 D-i-D (TRIS · Age)0.0057***[0.0019]0.0103***[0.0019]
SW indicator D-i-D (TRIS · Age)0.0063***[0.0019]0.0105***[0.0019]
ITR and PAYG data53–54 vs 56–5753–54 vs 56–57
Earned incomeMales
NIFW Indicator 2 D-i-D (TRIS · Age)0.0153***[0.0052]0.0264***[0.0052]
NIFW Indicator 3 D-i-D (TRIS · Age)0.0045[0.0056]0.0132**[0.0056]
SW indicator D-i-D (TRIS · Age)0.0037[0.0057]0.0110*[0.0057]
Females
NIFW Indicator 2 D-i-D (TRIS · Age)−0.0037[0.0059]0.0048[0.0058]
NIFW Indicator 3 D-i-D (TRIS · Age)−0.0037[0.0059]−0.0019[0.0059]
SW indicator D-i-D (TRIS · Age)−0.0069[0.0059]−0.0026[0.0059]
2006–07 vs 2007–082006–07 vs 2008–09
ITR, PAYG, and ABS estimates58–59 vs 61–6258–59 vs 61–62
Labor supplyMales
NIFW Indicator 2 D-i-D (TRIS · Age)0.0059***[0.0019]0.0133***[0.0018]
NIFW Indicator 3 D-i-D (TRIS · Age)0.0094***[0.0020]0.0146***[0.0020]
SW indicator D-i-D (TRIS · Age)0.0092***[0.0020]0.0137***[0.0020]
Females
NIFW Indicator 2 D-i-D (TRIS · Age)0.0022[0.0020]0.0072***[0.0020]
NIFW Indicator 3 D-i-D (TRIS · Age)0.0022[0.0020]0.0078***[0.0020]
SW indicator D-i-D (TRIS · Age)0.0022[0.0020]0.0073***[0.0020]
ITR and PAYG data58–59 vs 61–6258–59 vs 61–62
Earned incomeMales
NIFW Indicator 2 D-i-D (TRIS · Age)0.0026[0.0067]0.0065[0.0066]
NIFW Indicator 3 D-i-D (TRIS · Age)−0.0141*[0.0072]−0.0046[0.0070]
SW indicator D-i-D (TRIS · Age)−0.0191***[0.0074]−0.0064[0.0071]
Females
NIFW Indicator 2 D-i-D (TRIS · Age)0.0048[0.0081]0.0183**[0.0079]
NIFW Indicator 3 D-i-D (TRIS · Age)−0.0180**[0.0082]−0.0126[0.0079]
SW indicator D-i-D (TRIS · Age)−0.2060**[0.0083]−0.0142*[0.0079]

[i] Notes: Robust standard errors are presented in brackets.

[ii] ***, **, and * denote statistical significance at the 0.01, 0.05, and 0.1 levels, respectively.

[iii] ABS, Australian Bureau of Statistics; D-i-D, difference-in-differences; ITR, income tax return; NIFW, net income from working; PAYG, Pay-As-You-Go; PSI, personal services income; SW, salary and wage; TRIS, Transition to Retirement Income Streams.

Figure A1

A tax-effective strategy.

Figure A2

Historical concessional contributions caps.

Language: English
Accepted on: Jun 2, 2022
Published on: Nov 11, 2022
Published by: Sciendo
In partnership with: Paradigm Publishing Services
JEL:

© 2022 Andrew Dudley Carter, published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 License.