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8/11/2019 Changes in Wage Inequality in Canada: an Interprovincial Perspective
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Changes in Wage Inequality in Canada:an Interprovincial Perspective
Thomas Lemieux and Nicole Fortin
Vancouver School of EconomicsUniversity of British Columbia
INEQUALITY
IN
C ANADA
:DRIVING FORCES, OUTCOMES AND POLICY
IRPP-CLSRN CONFERENCE, FEBRUARY 24, 2014
8/11/2019 Changes in Wage Inequality in Canada: an Interprovincial Perspective
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Goal of the paper
! Take a fresh look at differences across provinces in recentwage inequality trends over the last 15 years using data from
the Labour Force Survey (LFS)
" Start with trends in median wages
" Then move to inequality (relative trends in 10th, 50th , and90th percentile)
" (Other dimensions of inequality, between-group, in thepaper)
! Seek to explain the source of interprovincial differences" Changes in the minimum wage
" Boom in the extractive resources sector in Alberta,Saskatchewan, and Newfoundland
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Background! Although most studies have focused on national trends, there
is evidence of important differences across provinces:
" Veall (2012) shows that the concentration of income at thetop end (top 1 %) has increased much in BC, Alberta andOntario than in other provinces
" Green and Sand (2013), and Marchand (2013) show that
the energy boom in Western Canada had a large impact onwages and earnings
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8/11/2019 Changes in Wage Inequality in Canada: an Interprovincial Perspective
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Plan of the paper
! Data and descriptive statistics" Basic trends at national and provincial level
1. The minimum wage and changes at the bottom end
" Use a Lee (1999) type approach to estimate the effect of
the minimum wage on the wage distribution"
Use the estimates to compute some counterfactualdistributions
2. Extractive resources sector and interprovincial trends
"
Composition effects vs spillovers" Impact on both the level of wages and inequality
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1 1
1 2
1 3
1 4
1 5
1 6
1 7 1
8 1 9 2 0
M e d
i a n W a g e s
1997 2000 2003 2006 2009 2012 Year
Nfld PEI NS NB QC
A. Eastern Provinces ($2002 dollars)
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1 1
1 2
1 3
1 4
1 5
1 6
1 7 1 8 1 9 2 0
1997 2000 2003 2006 2009 2012
Year
ON MA SK AL BC
B. Central and Western Provinces ($2002 dollars)
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9 0
1 0 0
1 1 0
1 2 0
1 3 0
1 4 0
1997 2000 2003 2006 2009 2012
Year
10th
50th
90th
A. Canada: Men and Women
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9 0
1 0 0
1 1 0
1 2 0
1 3 0
1 4 0
1997 2000 2003 2006 2009 2012
Year
10th
50th
90th
Nfld & Lab
9 0
1 0 0
1 1 0
1 2 0
1 3 0
1 4 0
R e a l W a g e I n d e x ( 1 9 9 7 = 1 0 0 )
1997 2000 2003 2006 2009 2012
Year
PEI
9 0
1 0 0
1 1 0
1 2 0
1 3 0
1 4 0
1997 2000 2003 2006 2009 2012
Year
Nova Scotia
9 0
1 0 0
1 1 0
1 2 0
1 3 0
1 4 0
R e a l W a g e I n d e x
( 1 9 9 7 = 1 0 0 )
1997 2000 2003 2006 2009 2012
Year
New Brunswick
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9 0
1 0 0
1 1 0
1 2 0
1 3 0
1 4 0
1997 2000 2003 2006 2009 2012Year
10th
50th
90th
Quebec
9 0
1 0 0
1 1 0
1 2 0
1 3 0
1 4 0
R e a l W a g e I n d e x
( 1 9 9 7 = 1 0 0 )
1997 2000 2003 2006 2009 2012Year
Ontario
9 0
1 0 0
1 1 0
1 2 0
1 3 0
1 4 0
1997 2000 2003 2006 2009 2012
Year
Manitoba
9 0
1 0 0
1 1 0
1 2 0
1 3 0
1 4 0
R e a l W a g e I n d
e x ( 1 9 9 7 = 1 0 0 )
1997 2000 2003 2006 2009 2012
Year
Saskatchewan
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# In many provinces, there is more wage growth at the 10th percentile than at the 50th!
# Could minimum wages be implicated?
9 0
1 0 0
1 1 0
1
2 0
1 3 0
1 4 0
1997 2000 2003 2006 2009 2012
Year
10th
50th
90th
Albert
9 0
1 0 0
1 1 0
1
2 0
1 3 0
1 4 0
R e a l W a g e I n d e x ( 1 9 9 7 = 1 0 0 )
1997 2000 2003 2006 2009 2012
Year
British Columbia
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5
5 . 5
6
6 . 5
7
7 . 5
8
8 . 5 9
9 . 5 1 0
1997 2000 2003 2006 2009 2012
Year
Nfld PEI NS NB MA SK
B. Smaller Provinces
Changes in Real Minimum Wages
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5
5 . 5
6
6 . 5
7
7 . 5
8
8 . 5 9
9 . 5 1 0
1997 2000 2003 2006 2009 2012
Year
QC ON AL BC
A. Larger ProvincesChanges in Real Minimum Wages
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Minimum wage
!
One potential explanation for the increase in wages at thebottom end in many provinces is the growth in the minimumwage since about 2006
! We investigate this using Lee (1999) approach:
! Run a regression of relative wage percentiles (e.g. 10th
relative to the median) on the relative value of the minimumwage in province i at time t:
(witq – wit
.5) = aq (MWit - wit.5) + bq (MWit - wit
.5)2
+ ciq
t + !iq
+ "tq
+ #itq
, (2)
* In practice, wit.5 is replaced by (wit
.45+wit.55)/2
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- 1 . 1
- 1
- . 9
- . 8
- . 7
- . 6
- . 5
-1.1 -1 -.9 -.8 -.7 -.6 -.5
Relative Minimum Wage
45 degrees line
A. 5th Percentile
- 1 . 1
- 1
- . 9
- . 8
- . 7
- . 6
- . 5
R e l a t i v e W a g e P
e r c e n t i l e
-1.1 -1 -.9 -.8 -.7 -.6 -.5
Relative Minimum Wage
B. 10th Percentile
- 1
- . 9
- . 8
- . 7
- . 6
- . 5
- . 4
-1.1 -1 -.9 -.8 -.7 -.6 -.5
Relative Minimum Wage
C. 15th Percentile
- 1
- . 9
- . 8
- . 7
- . 6
- . 5
- . 4
R e l a t i v e W a g e P e r c e n t i l e
-1.1 -1 -.9 -.8 -.7 -.6 -.5
Relative Minimum Wage
D. 20th Percentile
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Table 3: Estimated effect of the minimum wage on various wage percentiles
Wage percentile: 5th 10th 15th 20th 25th
A. Linear
specification
Rel. min. wage 0.673 0.312 0.084 0.003 -0.041
(0.071) (0.045) (0.033) (0.077) (0.042)
B. Quadratic specification
Rel. min. wage 3.489 1.497 1.205 0.407 0.730
(1.475) (0.875) (0.335) (0.975) (0.422)
Rel. mw squared
1.700
0.715
0.677
0.244
0.465 (0.881)
(0.526)
(0.207)
(0.579)
(0.253)
Joint test (p-value) 0.0000 0.0001 0.0049 0.9146 0.1640
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Policy Counterfactuals
!
How much of the changes at the bottom of the wagedistribution are linked to changes in the real value of theminimum wage?
! We compute counterfactual wage percentiles as if the relative
minimum wage (relative to the median) has stayed constant ata ratio of 45%, a relatively high minimum wage
!
We compute the counterfactual wage percentiles by replacingthe actual relative minimum wage by its average value of -0.8(0.64 for the squared term),
"#$% q = witq + aq [-0.80 –(MWit - wit
.5)] + bq [0.64 -(MWit - wit.
5)]2
(3)
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9 0
1 0 0
1 1 0
1 2 0
1 3 0
1 4 0
1997 2000 2003 2006 2009 2012Year
10th
10th adjusted for MW
50th
90th
Nfld & Lab
9 0
1 0 0
1 1 0
1 2 0
1 3 0
1 4 0
R e a l W a g e I n d e x
( 1 9 9 7 = 1 0 0 )
1997 2000 2003 2006 2009 2012Year
PEI
9 0
1 0 0
1 1 0
1 2 0
1 3 0
1 4 0
1997 2000 2003 2006 2009 2012Year
Nova Scotia
9 0
1 0 0
1 1 0
1 2 0
1 3 0
1 4 0
R e a l W a g e I n d
e x ( 1 9 9 7 = 1 0 0 )
1997 2000 2003 2006 2009 2012Year
New Brunswick
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9 0
1 0 0
1 1 0
1 2 0
1 3 0
1 4 0
1997 2000 2003 2006 2009 2012
Year
10th
10th adjusted for MW
50th
90th
Quebec
9 0
1 0 0
1 1 0
1 2 0
1 3 0
1 4 0
R e a l W a g e I n d e x
( 1 9 9 7 = 1 0 0 )
1997 2000 2003 2006 2009 2012
Year
Ontario
9 0
1 0 0
1 1 0
1 2 0
1 3 0
1 4 0
1997 2000 2003 2006 2009 2012
Year
Manitoba
9 0
1 0 0
1 1 0
1 2 0
1 3 0
1 4 0
R e a l W a g e I n d e x
( 1 9 9 7 = 1 0 0 )
1997 2000 2003 2006 2009 2012
Year
Saskatchewan
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9 0
1 0 0
1 1 0
1
2 0
1 3 0
1 4 0
1997 2000 2003 2006 2009 2012
Year
Alberta
9 0
1 0 0
1 1 0
1
2 0
1 3 0
1 4 0
R e a l W a g e I n d e x (
1 9 9 7 = 1 0 0 )
1997 2000 2003 2006 2009 2012
Year
British Columbia
# When we hold the relative minimum wage constant, thecounterfactual10th percentile more closely follows the rest
of the distribution!
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- . 0 2
0
. 0 2 . 0 4 . 0
6 . 0
8
. 1
. 1 2 . 1
4
0 10 20 30 40 50 60 70 80 90 100Percentile
2000-2010 with MW adjustment
2000-2005 with MW adjustment
2005-2010 with MW adjustment
Canada: Men and Women
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Extractive resources industries
!
Another striking fact is that Alberta, Saskatchewan, andNewfoundland have experienced much more real wagegrowth than other provinces.
! These provinces have little in common (especially Nfld)
except for the fact extractive resources industries (mining andoil and gas extraction) have grown much more there thanelsewhere.
!
Could this explain the differences across provinces?! How about the fraction of workers employers in extractive
resource industries?
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0
. 0 2
. 0 4
. 0 6
. 0 8
. 1
F r a c t i o n
2000 2003 2006 2009 2012Year
Nfld PEI NS NB QC
Fraction of Men Employed in Extractive Sector A. Eastern Provinces
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0
. 0 2
. 0 4
. 0 6
. 0 8
. 1
F r a c t i o n
2000 2003 2006 2009 2012Year
ON MA SK AL BC
B. Central and Western Provinces
Fraction of Men Employed in Extractive Sector
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Possible channels
!
Composition effects
" Jobs in extractive resources have a large wage premium.So more of these jobs increase average wages. Can beassessed doing a Oaxaca decomposition.
! Spillover effects / externalities" The resource boom may also have spillover effects on
other sectors: construction, local services, etc.
" Have to take a more aggregate approach to assess the
importance of these effects
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Spillover effects
!
Using detailed regional data from Western Canada, Marchand(2013) finds such impacts on other industries
! More generally, Beaudry, Green, and Sand (2012) show that“good jobs” have large spillover effect. Impact 3-4 times largethan what would expect based on composition effects
! We assess this using province-level regressions:
wit = $ + % Dit + !i + "t + #it (4)
where D is either the fraction of employment in extractive
resource industries and/or an aggregate industry wagepremium index (computed using observed industrycomposition by province*year and average national industrypremia)
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Effects of Demand Shocks on Average (Adjusted)
Provincial Wages
!""
#$ &'( ")** $+,) -$ .'/0)1*/23 #$ &'( ")** $+,) -$ .'/0)1*/23
!4 5'(6*213 71),/6, +'"3
5'(6*213 71),/6, 849:: 84;9< 84=9> 94:8: ?4@@: =4A@= =4:A@
B>48:>C B>4?8=C B>48=>C B>49:8C B>4?<8C B>4A>>C B>48?>C
D4 EF21&G2/0) /'(6*21/)* *H&1) +'"3
EF21&G2/0) 1)**+61G) 84<8; ?489= ?4@@9 84@=< 84;=> 84A:9 =489?
*H&1) B@4<<=C B@4;=:C B@4<=AC B>4>=:C B>4>>AC B@4;>AC B@4;<9C
I4 D+2H /'(6*213 71),/6, &'( )F21&G2/0) *H&1)
5'(6*213 71),/6, >4;@> 94=9= >4<:9 @48?8 94A:A >49:> 94>:=
B>4>>9C B@4<=;C B@4<@AC B>4=8?C B>4=A:C B>48>@C B>4=>9C
EF21&G2/0) 1)**+61G) 84><9 84:@< 84=8; =4<A; =4;:@ 84=>; 94::A
*H&1) B@4;:>C B@4A@;C B@4A8:C B>4=A<C B>4=@=C B>4@<9C B@4;<?C
J)' +'"3 K+,)' +'"3
L&M") ?N O)P1)**/+' ,+()"* Q/2H 71+0/'G)R")0)" /'(6*213 *H&1)*
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Spillover effects
!
Approach based on province-level regressions has a muchlarger impact
! It also suggests the resources boom had a larger impact atthe lower end of the distribution (less educated workers), thuscontributing to a decline in inequality within the affected
provinces.! This is illustrated by estimating various versions of equation
(4) and using it to compute several counterfactuals
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Factors Accounting for Interprovincial Differences
!"#$%&'()$ *$%&'()$ ,-. /01 23&' /01 23&' /41 #"$ /51
$)6-7.#289:' #77.; 9"$; '8#.) )<(.; (-7)(8).
#"$ 9"$&'(.= 2.)69&6 .)'-&.:)'
/>1 /01 /41 /51 /?1
@)A,-&"$3#"$ 0B;C 0>;5 >D;5 C;C D;E
FGH >0;4 >B;D 5;C I;C ?;?
@-J# K:-(9# >B;I >>;I D;> >0;E >>;4
@)A L.&"'A9:M C;> I;D 4;I E;> 5;?
N&)O): B;5 >;? PB;? B;C B;B
Q"(#.9- PPP PPP PPP PPP PPPR#"9(-O# I;D C;B 5;I C;B E;?
K#'M#(:8)A#" 0B;> >D;I >0;0 D;B I;0
*3O).(# 0>;D 0>;4 >?;I I;5 E;D
L.9(9'8 S-3&6O9# P4;D P0;5 P4;0 P?;I P?;E
T#O3) EU T.)"$ 9" 6)#" A#7)' .)3#(9J) (- Q"(#.9-V >DDD (- 0B>0
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Conclusion -1
!
Changes in minimum wages explain why wages at the verybottom (e.g. the 10th percentile) grew more than in the middleof the distribution over the last 10-15 years.
! Most provinces have increased their minimum wages
substantially since about 2005, and changes in (province-level) wages at the bottom of the wage distribution are closelyconnected to changes in provincial minimum wages.
! Effects are substantial enough to account for any wagepolarization over the period.
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Conclusion -2
!
The dominant trend across provinces is much faster muchfaster wage growth in Newfoundland, Saskatchewan, and Alberta than in other provinces since the late 1990s.
! Using Ontario as a benchmark, average wages have grown
by 20 percentage points more in these three provinces.! The resource boom appears to have “lifted all
boats” (including less educated and women) and contributedto a small decline in inequality in Alberta and Saskatchewan.
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Thank you!
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9 0
1
0 0
1 1 0
1 2 0
1 3 0
1 4 0
1997 2000 2003 2006 2009 2012
Year
B. Canada: Men
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9 0
1
0 0
1 1 0
1 2 0
1 3 0
1 4 0
1997 2000 2003 2006 2009 2012
Year
C. Canada: Women
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- . 0 4 - . 0 2
0
. 0 2
. 0 4
. 0 6
. 0 8
. 1
. 1 2
. 1 4
0 10 20 30 40 50 60 70 80 90 100
Percentile
2000-2010
2000-2005
2005-2010
A. Canada: Men and Women
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0
. 0 2
. 0 4
. 0 6
. 0 8
. 1
F
r a c t i o n
2000 2003 2006 2009 2012
Year
ON MA SK AL BC
B. Central and Western Provinces
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Table 4: Industry wage differentials
Coefficient
Std error
Coefficient
Std error
Agriculture
-0.250
0.001
Transportation Equipment Manuf
0.136
0.001
Forestry and Logging
0.089
0.002
Furniture and Related Product Manuf
-0.157
0.002
Fishing, Hunting and Trapping -0.119 0.005 Miscellaneous Manufacturing -0.078 0.002
Mining and Oil & Gas Extraction 0.270 0.001 Wholesale Trade ---
Utilities 0.313 0.001 Retail Trade -0.215 0.001
Prime Contracting 0.103 0.001 Transportation 0.007 0.001
Trade Contracting
0.099
0.001
Wharehousing and Storage
-0.084
0.002
Food, Bever. and Tobacco Manuf
-0.054
0.001
Finance
0.144
0.001
Textile Mills & Textile Product Mills
-0.149
0.003
Insurance Carriers & Related Financial
0.158
0.001
Clothing Manufacturing & Leather
-0.264
0.002
Real Estate
-0.114
0.001
Wood Product Manufacturing
-0.001
0.001
Rental & Leasing Services
-0.144
0.002
Paper Manufacturing
0.182
0.002
Prof, Scientific and Tech Services
0.159
0.001
Printing and Related Support Activities
-0.014
0.002
Management & Administrative Support
-0.199
0.001
Petroleum and Coal Products Manuf 0.306 0.004 Educational Services 0.152 0.001
Chemical Manufacturing 0.135 0.002 Health Care and Social Assistance 0.098 0.001
Plastics and Rubber Products Manuf -0.035 0.002 Information, Culture and Recreation 0.021 0.001
Non-Metallic Mineral Product Manuf
0.026
0.002
Accommodation and Food Services
-0.287
0.001
Primary Metal Manufacturing
0.173
0.002
Other Services
-0.146
0.001
Fabricated Metal Product Manuf
0.013
0.001
Federal Government 0.272
0.001
Machinery Manufacturing
0.051
0.001
Provincial and Territorial Govt
0.242
0.001
Computer & Electronic Product Manuf
0.113
0.002
Local, Municipal & Regional Govt
0.181
0.001
Electrical Equipment & Appliance Manuf
0.012
0.002
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Table 7: Trend in university-high school wage gap relative to Ontario, 1999-2012
Men
Women
Adjusted for
(1) plus Adjusted for
(3) plus
demographics
share extr.
demographics
share extr.
and industry
resources
and industry
resources
(1)
(2)
(3)
(2)
Newfoundland
2.7 6.3 -6.7 -2.8
PEI
-1.0
-0.1
1.6
2.6
Nova Scotia
0.5 0.3 -3.6 -3.8
New Brunswick
-2.8 -2.3 -3.8 -3.2
Quebec
-4.5 -4.3 -3.3 -3.1
Ontario
--- --- --- ---
Manitoba
-5.9 -5.9 -2.0 -2.0
Saskatchewan
-8.5 -5.5 -1.3 2.1
Alberta
-11.3 -7.4 -8.2 -3.9
British Columbia
1.5 2.4 -0.6 0.4
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