1. Labour supply and demand
  2. Taxes and benefits
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Accounting for Behavioral Effects in Microsimulation: A Reduced Form Approach

  1. Joonas Ollonqvist  Is a corresponding author
  2. Jussi Tervola
  3. Jukka Pirttilä
  4. Thor O Thoresen
  1. Finnish Institute for Health and Welfare, Finland
  2. University of Helsinki and VATT Institute for Economic Research, Finland
  3. Research Department, Statistics Norway and Norwegian Fiscal Studies, the Department of Economics, University of Oslo, Norway
Research article
Cite this article as: J. Ollonqvist, J. Tervola, J. Pirttilä, T. O Thoresen; 2024; Accounting for Behavioral Effects in Microsimulation: A Reduced Form Approach; International Journal of Microsimulation; 17(3); 44-72. doi: 10.34196/ijm.00311
10 figures and 9 tables

Figures

Kernel density distributions of participation tax rates simulated with the baseline and reform legislations.
Kernel density distributions of effective marginal tax rates simulated with the baseline and reform legislations.
The average change (pp) of effective marginal tax rates annual earned income.
The policy effects (%) on disposable income by income decile.
The differences (pp) between behavioral and non-behavioral effects by income decile.
The policy effects (%) of various specifications on disposable income by income decile.
The differences (pp) in the effect of extensive margin responses in relation to the default specification (=0) by income decile.
The differences (pp) in the effect of intensive margin responses in relation to the default specification (=0) by income decile.
The differences (pp) in the effect of behavioral responses in relation to the baseline specification (=0) by income decile.
Effective marginal tax rates (%) by annual earned income with the baseline and reform legislations.

Tables

Table 1
PTR change by benefit receipt.
FreqPTR baselinePTR reformChange, pp
Flat rate UB280 00062.7%62.9%0.1
Earnings-related UB270 00069.3%69.7%0.4
Home care allowance100 00054.8%54.7%-0.1
Employed1 890 00066.6%67.2%0.5
Total2 540 00066.0%66.5%0.5
  1. Note: If individual have several income sources within a year the following prioritization is used: 1. Home care allowance, 2. Earnings-related UB and 3. Flat rate UB. Employed are individuals with positive labor income and not received home care allowance or any unemployment benefit within a year. Baseline refers to legislation of year 2019 and reform to legislation of year 2020.

Table 2
Extensive margin responses.
DefaultHeterogenous
elasticity
PTR increase (pp.-change)0.50.5
Population with increase2,260,0002,260,000
PTR decrease (pp.-change)- 0.3- 0.3
Population with decrease270,000270,000
Employment increase (person years)200
(100 – 300)
200
Employment decrease (person years)- 5,800
(-2,900 – -8,800)
- 5,700
Net change (person years)- 5,700
(-2,800 – -8,500)
- 5,500
  1. Note: Results are calculated with consumer price index and using the aggregate participation elasticity of 0.2. In heterogeneous elasticity column the aggregate participation elasticity is weighted using 8 different groups. The changes in PTR are the average changes and the values in brackets are formed using elasticities of 0.1 (LHS) and 0.3 (RHS). Values of employment changes are rounded to 100 units. Values of population with increase or decrease are rounded to 10,000 units.

Table 3
Changes in incentives and earnings in intensive margin with various specifications.
DefaultExtra income
of 6,000 euros/year
EMTR increase (pp-change)1.00.6
Population with increase1,920,0001,920,000
EMTR decrease (pp-change)-3.0-1.2
Population with decrease350,000390,000
Earnings increase (Me)120
(60 – 180)
40
Earnings decrease (Me)- 250
(-130 – -380)
- 190
Net change (Me)- 140
(-70 – -200)
- 150
  1. Note: Default results are calculated with extra income of 1,200 euro/year. All cases are calculated using consumer price index. Values in brackets are calculated using elasticities of 0.1 (LHS) and 0.3 (RHS). Me refers to millions of euro. Values of earnings changes are rounded to 10 million euros. Values of population with increase or decrease are rounded to 10,000 units.

Table 4
Policy effects on inequality and poverty indicators.
Base level in 20Non-behavioralExtensive marginIntensive marginBoth marginsTotal effect
Gini coefficient28-0.30.00.00.0-0.3
Equalized income
Median24,33554-29-17-477
At risk of poverty
Whole population (%)13.4-0.60.00.00.0-0.6
Whole population (N)738,000-32,5002,000-2001,600-30,900
Children (%)12.6-0.40.10.00.1-0.4
Children (N)133,600-4,600600100600-3,900
Elderly (%)12.7-1.40.00.00.0-1.4
Elderly (N)150,100-16,200000-16,200
Fiscal changes
Taxes (Me)35,700130-40-70-11020
Benefits (Me)13,60036090090450
Taxes-benefits (Me)22,100-230-140-70-210-430
  1. Note: Results are calculated with consumer price index, elasticities of 0.2 and extra income of 1 200 euro/year. Total effect is the sum of non-behavioral and behavioral effects. Extensive margin, intensive margin and both margins are calculated compared to the reform’s (2020) non-behavioral simulation. Non-behavioral and total effect are calculated compared to the base level results. Poverty line used is set to 60% of median income and it is fixed to the baseline (2019) level. Children are defined as individuals aged less than 18 years. Elderly are defined as individuals aged 65 or more. Changes of individuals in at risk of poverty are rounded to 100 individuals. Fiscal changes are rounded to 10 million euros and baseline values of taxes and benefits are rounded to 100 million euros.

Table 5
Social welfare effects.
Base levelDifference to base
in 2019Non-behaviorExtensiveIntensiveBoth margins
100×A(0.5)7.2-0.1-0.1-0.1-0.1
100×A(1)12.7-0.2-0.2-0.2-0.2
100×A(2)22.9-0.3-0.3-0.4-0.4
Mean equivalized
disp. income
27,7964625298
SWF=[1A(e)]Y¯
A(0.5)25,79172515837
A(1)24,25494748463
A(2)21,438130112124107
  1. Note: Inequality of the base situation and the change after the reform (Upper panel), with or without behavioural reactions and with Atkinson index with inequality aver sion equal to 0.5, 1, or 2. The lower panel depicts social welfare and the change relative to the base situation.

Table 6
Social welfare effects, revenue neutral case
Base levelDifference to base
in 2019Non-behaviorExtensiveIntensiveBoth margins
100×A(0.5)7.2-0.1-0.1-0.1-0.1
100×A(1)12.7-0.2-0.1-0.2-0.2
100×A(2)22.9-0.4-0.4-0.4-0.4
Mean equivalized
disp. income
27,796-14-35-31-52
Mean disp. income,household level38,5030-28-22-50
SWF=[1A(e)]Y¯
A(0.5)25,7919-12-5-26
A(1)24,25429919-2
A(2)21,43891738568
  1. Note: Inequality of the base situation and the change after the reform (Upper panel), with or without behavioural reactions and with Atkinson index with in equality aver-sion equal to 0.5, 1, or 2. The reform is made revenue neutral by levying an additional lump-sum tax to all individuals. The lower panel depicts social welfare and the change relative to the base situation.

Table A1
Regression coefficients for male wage prediction.
Males (y=log monthly wage)Lone dwellersCouplesSingle parentsTwo parent familiesOthers
coeffp-valuecoeffp-valuecoeffp-valuecoeffp-valuecoeffp-value
Intercept7.4550.0007.2000.0007.7100.0006.8630.0007.6420.000
Age0.0270.0000.0240.0000.0180.0000.0350.0000.0160.000
Age20.0000.0000.0000.0000.0000.0030.0000.0000.0000.000
Field of education (ref. unknown or other)
Generic programmes0.1290.0190.3920.0000.0010.9970.4770.0000.2850.000
Education-0.0970.1040.0770.203-0.2520.4530.0290.5750.0360.677
Humanities and arts-0.0870.1190.0470.421-0.2190.5060.0590.2460.1120.160
Business and social sciences0.0580.2910.2600.000-0.0670.8380.3620.0000.2380.002
Natural sciences. mathematics0.0180.7470.1940.001-0.0740.8210.2180.0000.1840.022
Engineering and manufacturing0.1150.0340.3080.0000.0180.9570.3680.0000.2840.000
Agriculture and forestry0.0330.5580.1830.002-0.0280.9310.2540.0000.1740.028
Health and welfare0.0690.2090.2370.000-0.0660.8400.2660.0000.2690.001
Services0.0560.3070.2540.000-0.0420.8970.3000.0000.2420.002
Level of education (ref. doctoral or equivalent)
Unknown or primary-0.4040.000-0.2890.000-0.6450.051-0.2070.000-0.3330.000
Secondary-0.4710.000-0.5330.000-0.6190.000-0.5270.000-0.5470.000
Post-secondary non-tertiary-0.3390.000-0.4310.000-0.4300.000-0.4190.000-0.4910.000
Short-cycle tertiary-0.3060.000-0.3120.000-0.3730.000-0.2950.000-0.3500.000
Master’s or equivalent-0.0870.000-0.0620.001-0.0580.302-0.0170.210-0.1380.001
Ages of children
Less than 3 years (0/1)-0.0030.964-0.0020.797-0.0120.480
3-6 years (0/1)0.0200.5250.0040.421-0.0420.006
7-18 years (0/1)-0.0410.321-0.0180.002-0.0100.359
Region (ref. Lapland)
Uusimaa0.0410.0010.0940.0000.1320.0000.1210.0000.0670.007
Etelä-Savo-0.0760.000-0.0690.000-0.0590.168-0.0590.0000.0070.859
Pohjois-Savo-0.0560.000-0.0400.0050.0110.770-0.0420.0010.0200.549
Pohjois-Karjala-0.0850.000-0.0580.000-0.0460.262-0.0710.000-0.0310.417
Keski-Suomi-0.0440.003-0.0280.0450.0030.941-0.0170.162-0.0120.709
Etelä-Pohjanmaa-0.0840.000-0.0720.000-0.0300.455-0.0890.000-0.0670.067
Pohjanmaa-0.0620.000-0.0070.6610.0040.925-0.0290.028-0.0380.288
Keski-Pohjanmaa-0.0480.035-0.0330.120-0.0080.884-0.0330.058-0.0530.276
Pohjois-Pohjanmaa-0.0310.023-0.0300.024-0.0010.982-0.0110.3200.0090.771
Kainuu-0.0670.001-0.0550.0070.0090.857-0.0520.0040.0060.918
Varsinais-Suomi-0.0420.002-0.0120.344-0.0150.648-0.0160.151-0.0300.289
Satakunta-0.0120.4250.0090.5240.0540.1320.0030.7900.0230.490
Kanta-Häme-0.0160.297-0.0030.8410.0380.3150.0040.7500.0070.839
Pirkanmaa-0.0490.000-0.0050.7030.0320.3190.0040.731-0.0240.404
Päijät-Häme-0.0250.108-0.0110.4660.0710.073-0.0090.475-0.0080.807
Kymenlaakso0.0220.1640.0510.0010.0770.0570.0170.209-0.0090.805
Etelä-Karjala-0.0130.4510.0130.4150.0820.066-0.0080.6170.0030.945
Months in unemployment during the year (ref. more than 8)
Less than 30.1920.0000.1640.0000.2930.0180.1600.0000.1310.012
3-50.1050.0020.0810.0640.2250.0730.0540.1870.0630.252
6-80.0330.417-0.1080.0310.1850.1650.0120.8060.0080.901
Employment days0.0630.0000.0760.0000.0740.0000.0760.0000.0520.000
(100) in prev. year
Existing debt (0/1)0.1130.0000.0820.0000.1350.0000.0960.0000.1210.000
Married (0/1)0.0660.0000.0270.0000.0810.0000.0450.0000.0600.000
Income of other hh members (log €)0.0070.000-0.0050.0010.0180.0000.0020.049
Table A2
Regression coefficients for female wage prediction.
Females (y=log monthly wage)Lone dwellersCouplesSingle parentsTwo parent familiesOthers
coeffp-valuecoeffp-valuecoeffp-valuecoeffp-valuecoeffp-value
Intercept7.5220.0007.3850.0007.4590.0007.1300.0007.5910.000
Age0.0160.0000.0160.0000.0150.0000.0220.0000.0080.000
Age20.0000.0000.0000.0000.0000.0000.0000.0000.0000.113
Field of education (ref. unknown or other)
Generic programmes0.3720.0000.3380.0000.2590.0000.3990.0000.4080.000
Education0.2160.0020.1720.0020.0240.7330.1170.0080.2720.000
Humanities and arts0.2010.0040.1570.0040.0460.5200.1430.0010.2610.000
Business and social sciences0.3250.0000.2820.0000.1920.0060.2950.0000.3720.000
Natural sciences. mathematics0.2860.0000.2570.0000.1640.0260.2320.0000.3590.000
Engineering and manufacturing0.3490.0000.3130.0000.2340.0010.3460.0000.3660.000
Agriculture and forestry0.2570.0000.2470.0000.1150.1150.2220.0000.2880.000
Health and welfare0.3390.0000.2750.0000.1700.0160.2530.0000.3830.000
Services0.2490.0000.1920.0000.1040.1410.1950.0000.3010.000
Level of education (ref. doctoral or equivalent)
Unknown or primary-0.3380.000-0.4350.000-0.4810.000-0.4000.000-0.3980.000
Secondary-0.6070.000-0.6690.000-0.5930.000-0.6390.000-0.6950.000
Post-secondary non-tertiary-0.5030.000-0.5560.000-0.4990.000-0.5320.000-0.5680.000
Short-cycle tertiary-0.4480.000-0.5000.000-0.4160.000-0.4770.000-0.5400.000
Master’s or equivalent-0.1620.000-0.1920.000-0.0910.001-0.1470.000-0.2400.000
Ages of children
Less than 3 years (0/1)0.0640.0010.0720.000-0.0210.264
3-6 years (0/1)0.0210.0440.0230.0000.0050.729
7-18 years (0/1)0.0110.4330.0160.005-0.0120.242
Region (ref. Lapland)
Uusimaa0.0850.0000.1160.0000.1420.0000.1080.0000.0970.000
Etelä-Savo-0.0170.320-0.0290.0220.0140.575-0.0220.085-0.0010.987
Pohjois-Savo-0.0270.075-0.0060.5600.0300.1700.0070.546-0.0020.940
Pohjois-Karjala-0.0440.013-0.0190.1200.0170.491-0.0140.262-0.0070.819
Keski-Suomi-0.0400.008-0.0140.1900.0050.810-0.0240.0250.0090.749
Etelä-Pohjanmaa-0.0260.117-0.0190.1210.0090.698-0.0310.006-0.0090.767
Pohjanmaa-0.0530.002-0.0220.0700.0430.080-0.0460.000-0.0540.070
Keski-Pohjanmaa-0.0320.174-0.0240.1460.0050.864-0.0490.0020.0150.713
Pohjois-Pohjanmaa-0.0400.0040.0000.9990.0090.641-0.0040.6590.0160.537
Kainuu-0.0440.045-0.0230.1340.0300.3630.0010.936-0.1090.014
Varsinais-Suomi-0.0110.3800.0180.0740.0340.0740.0120.1980.0120.612
Satakunta-0.0230.134-0.0060.6040.0170.429-0.0030.772-0.0260.378
Kanta-Häme0.0070.6630.0300.0090.0650.0040.0290.0110.0180.552
Pirkanmaa-0.0120.3640.0170.0820.0530.005-0.0040.648-0.0090.701
Päijät-Häme-0.0130.3790.0140.2280.0500.023-0.0030.7700.0050.856
Kymenlaakso-0.0070.6430.0020.8520.0230.3160.0040.7500.0020.948
Etelä-Karjala-0.0130.4600.0010.9600.0190.452-0.0130.306-0.0130.730
Months in unemployment during the year (ref. more than 8)
Less than 30.0130.7960.0420.4620.0590.4180.0380.5090.1090.207
3-5-0.0430.402-0.0070.901-0.0340.646-0.0280.6280.0840.348
6-8-0.1290.039-0.1160.088-0.0810.397-0.1090.124-0.0890.390
Employment days0.0620.0000.0580.0000.0530.0000.0480.0000.0570.000
(100) in prev. year
Existing debt (0/1)0.0790.0000.0620.0000.1030.0000.0680.0000.0750.000
Married (0/1)0.0230.0150.0070.048-0.0090.386-0.0020.572-0.0140.102
Income of other hh members (log €)0.0150.000-0.0030.0000.0160.0000.0000.964
Table B3
Heterogeneous weights for participation elasticity
WomenMen
Age of the youngest childrenOver 17 years or no children1.280.92
under 3 years old1.320.92
3 to 7 years old10.68
8 to 17 years old0.840.56
  1. Source: Own calculations based on Kotamäki and Kärkkäinen (2018)

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