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IS WAGE INEQUALITY LIMITED THROUGH FIRM HUMAN RESOURCE
MANAGEMENT PRACTICES?1
John C. Dencker
University of Illinois at Urbana-ChampaignSchool of Labor and Employment Relations
504 E. Armory Avenue
Champaign, IL 61820Tel: (217) 333-2383
e-mail: [email protected]
Chichun Fang
University of Illinois at Urbana-ChampaignSchool of Labor and Employment Relations
504 E. Armory AvenueChampaign, IL 61820
Tel: (217) 265-0954
e-mail: [email protected]
January 15, 2009
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IS WAGE INEQUALITY LIMITED THROUGH FIRM HUMAN RESOURCE
MANAGEMENT PRACTICES?
ABSTRACT
We examine the dynamics of wage patterns in a large firm, focusing on the role of HRM systems
and compensation practices in shaping wage patterns and inequality through corporate
restructuring. We conclude that the firms HRM system and its internal labor market mechanism
governed the wage patterns and limited wage inequality considerably prior to the onset of
restructuring. However, the firms institutional power on wage determination was undermined
after corporate restructuring as the wage inequality within the firm increased. After restructuring,
the firm became more inclined to reward high performance workers, and reduced entry-level
wages for a number of workers.
Key Words: Compensation, Corporate Restructuring, Wage Inequality
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INTRODUCTION
The increase of wage inequality in U.S. labor market during 1980s is well documented.
In brief, the wage structure polarized (Morris, Bernhardt, & Handcock, 1994), as the upper-tail
(the difference between the 90th
and 50th
percentiles) inequality increased steadily and the lower
tail (the difference between the 50th
and 10th
percentiles) inequality rose sharply in early 1980s
but stopped increasing thereafter (Autor, Katz, & Kearney, 2008).
While the increase of wage inequality in 1980s is studied early and a lot in labor
economics (Autor et al., 2008; Autor, Katz, & Krueger, 1998; Borjas & Ramey, 1995; Card &
DiNardo, 2002; Chay & Lee, 2000; DiNardo, Fortin, & Lemieux, 1996; Katz & Murphy, 1992;
Lemieux, 2006; Murphy & Welch, 1992), the roles of the firm and its human resource policies in
contributing to such increase is surprisingly not widely studied. Since wages are paid by the firm,
which makes pay decisions relying on its human resource management practices and
compensation policies, such dramatic change in wage inequality should be closely related with
change in human resource management practices.
The relationship between human resource management practices and firm performance
has early been established (Huselid, 1995; Ichniowski, Shaw, & Prennushi, 1997; MacDuffie,
1995; Youndt, Snell, Dean, & Lepak, 1996). Among all the human resource practices,
compensation policies have been related with various outcomes such as individual incentives
(Guzzo, Jette, & Katzell, 1985; Jenkins, Gupta, Gupta, & Shaw, 1998; Stajkovic & Luthans,
1997), turnover (Shaw & Gupta, 2007; Shaw, Gupta, & Delery, 2005), and promotion (Gerhart
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theory and seen as a practice rather the outcome of a firms compensation policy (Cowherd &
Levine, 1992). In this study, we view wage dispersion as the outcome of compensation policies
and examine the impact of a firms compensation rules on its wage dynamics. More specifically,
we discuss how the change in compensation policies caused by corporate restructuring influences
wage patterns and distribution. We also explore how the firms ability to limit wage inequality is
reduced through restructuring.
We find systematic and consistent wage patterns within the firm before and after
corporate restructuring. Cohort and tenure effects are significant; employees entered the firm in
different years may receive different entry wages depending on market conditions, but the wage
growth patterns conditional on respective entering wages are very similar. The effects of firm
restructuring, however, varies by types of employees. For blue collar workers, the post-
restructuring wage distribution is more polarized than the pre-restructuring distribution. For
white collar clericals and managers, the distribution shifts rightwards and becomes more
dispersed in the right tail, indicating both real wage level and wage dispersion increase after
restructuring. This suggests the firm was losing its ability to control wage inequality within the
firm after corporate restructuring.
THE FIRMS ROLE IN SHAPING WAGE DISTRIBUTION
We argue that the firm and its HR practices play an important role in shaping the wage
distribution. Studies have shown that human resource practices modify the effect of
technological changes on hourly workers (Fernandez, 2001) and influence the link between
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rigidity (Gibbs & Hendricks, 2004; Harris & Holmstrom, 1982; Seltzer & Merrett, 2000).
Through its internal labor market, the firm can provide employees job security and opportunities
for career development, and it also shields employees from labor market fluctuations (Doeringer
& Piore, 1971; Osterman, 1984). While the employees are moved among positions, the overall
wage structure and wage policies of the firm are guided by the job levels and tenure effect. The
firms compensation policies hence play the key role of shaping wage patterns and distributions
and controlling wage inequality.
Nevertheless, the effectiveness of internal labor market might be weakened through a
sequence of deregulation and hostile acquisitions (Cappelli, 1992; Cascio, Young, & Morris,
1997) that necessitates economic efficiency in firm operations (Schleifer & Summers, 1998;
Useem, 1996). Employees will be exposed to external market conditions (Cappelli et al., 1997;
Eriksson & Werwatz, 2005; Lazear & Oyer, 2004), and the firm is also more inclined to reward
high performance employees (Cappelli et al., 1997; Mitchell, 1989; Zenger, 1992); both will
change the role of a firm in shaping the wage distribution and undermine the firms power to
limit wage inequality.
Cohort and Tenure Effects
Wages can increase with tenure for several reasons, such as the accumulation of firm-
specific human capital (Becker, 1975), attaining higher position in firm hierarchy (Lazear, 1995;
Lazear & Rosen, 1981), or a deferred compensation used as incentives for staying in the firm
(Gibbons & Waldman, 1999, 2006). In the absence of dramatic institutional changes, tenure
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overall wage patterns and wage distribution, unless the composition of employees within a firm
changes (as a counter example, the overall aging of baby boom generation in 1980s is believed to
be one of the many reasons why the upper tail of wage distribution thickened at that time.)
However, the firm might pay different entry wages to the employee cohorts who enter in
different years. This is especially likely when the firm is under the economic pressure and needs
to peg its entry wages to market clearing wages or when a two-tier wage structure is
implemented (Martin & Peterson, 1987). Cohort effect is expected to impact the variation of
wage patterns across cohorts (Baker et al., 1994b; Heckman & Robb, 1985; Lazear, 1995), even
when tenure effect applies uniformly to all employees. The discrepancy in entry wages of two
adjacent cohorts could still persist after more than 15 years of tenure (Baker et al., 1994b).
Downward Wage Rigidity
In a neo-classical economics setting where wages are set to be equal to the value of
marginal products according to spot contracts, wages should fluctuate both upwards and
downwards with market condition. However, implicit contract theory suggests that a risk-averse
employee will accept lower life-time earnings if their annual compensation are guaranteed not to
decrease during economic downturns (Azariadis, 1975; Baily, 1974; Klaas & Ullman, 1995).
And hence, once being employed, wages will be sticky (Okun, 1981) or downward rigid
(Harris & Holmstrom, 1982). On the other hand, the employer might be more inclined to adjust
compensation than employment (Craig & Pencavel, 1992) to provide job security. Empirical
results about downward wage rigidity are mixed: some report nominal wage cuts are not rare
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Downward wage rigidity, if any, provides not only job security but also a guaranteed
level of income. Comparing to the potential wage loss due to involuntary turnover and loss of
firm-or industry-specific human capital (Neal, 1995) that may take more than 5 years for a
displaced worker to re-attain his or her pre-displacement income level (Podgursky & Swaim,
1987)1, downward wage rigidity avoids wage loss and compresses the bottom tail of wage
distribution, since the very first wage offer to an employee receives will server as an anchor in
his or her future wage profile. In this sense, the firm plays an important role in limiting the
increase in wage inequality (especially in the lower tail of distribution) and guarantees
employee's quality of life when wages are downward rigid.
Promotion and Fast-trackers
Although tenure and cohort effects that apply uniformly to employees who have the same
tenure and entered the firm in the same year, employees are treated differently in the firm. Since
wages are largely attached to job levels, the way an employer promotes/demotes employees will
also influence wage patterns. Studies have shown the existence of fast-trackers (Baker et al.,
1994a; Rosenbaum, 1979, 1984; Seltzer & Merrett, 2000; Treble et al., 2001), who are high
performance workers and are promoted at a much faster pace than others. Studies also show that
conditional on wages at the time t, wages at time t+1 and time t-1 are negatively correlated
(Chiappori, Salani, & Valentin, 1999), indicating employees who receive a higher raise this
year are more likely to receive a higher raise in the coming years as well.
Corporate Restructuring
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Mergers and hostile acquisitions that followed the deregulation in late-1970s and early-
1980s (Schleifer & Summers, 1998) ignited the firms pursuit of organizational efficiency
(Useem, 1996), which in turn led to restructuring, including reduction in forces (RIFs) and
changes in wage policies (Cappelli et al., 1997; Cascio et al., 1997). Firm engaging in RIF
undermined job security provided under internal labor markets, and continuing employment were
more influenced by market factors (Cappelli, 1992; Eriksson & Werwatz, 2005; Lazear & Oyer,
2004). Also, changing the compensation scheme to a reward or performance based system made
pay more variable than it would have been in the previous seniority-based system (Cappelli et al.,
1997; Mitchell, 1989). The firm will be more inclined to reward high performance employees
(Cappelli et al. 1997; Mitchell 1989; Zenger 1992). And hence, firm restructuring should lead to
a more wide-spread wage distribution and decreasing returns to seniority.
Corporate restructuring can limit the firms ability to reduce wage inequality. Wage
inequality within a firm is limited through cohort and tenure effects that govern the behavior of
group wages, and downward rigidity of wages, if any, anchors the lower tail of wage distribution.
Oppositely, a more dispersed wage distribution due to corporate restructuring that both decreases
the wages of low wage earners and increases the wages of high wage earners indicates the
reducing effectiveness of a firms internal labor market mechanism. The firms ability to control
wage inequality within the firm is hence weakened.
The firm that we study experienced several waves of restructuring. Two waves of
reduction in force (RIF) were undertaken. The first RIF tool place in early- to mid-1980s during
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seniority-based pay scheme was changed to a performance-based one. The firm sought to make
performance goals more measurable and relevant, which pay decisions can be made upon.
Additionally, the firm destroyed the performance evaluation records once promotion and pay
raise decisions were made. The purpose of this was to make sure performance evaluation would
not be biased by an employees past performances, and hence, all promotions and pay raises
would have to be re-earned each year.
ORGANIZATIONAL SETTING, DATA, AND METHODS
Organizational Setting
The firm that we study is a Fortune 500 firm in energy sector. Like most other large
firms studied over the same period of the time (Baker et al., 1994a), this firm also had an internal
labor market composed of hierarchically-ranked salary grade levels (SGLs) to which jobs and
salaries were attached. Non-exempt employees (clerical, secretarial, and support staff) ranked in
SGL 1 through 9, and exempted workers (managers and professionals) were in SGL 7 through 24.
Additionally, roughly 25% of employees were paid on hourly basis and did not belong to a salary
grade level. We use the terms white collar clericals, white collar managers and blue collar
workers to denote these three broad categories, respectively. An employee hired as an hourly
worker could be promoted to a white collar clerical later in the career, so could a white collar
clerical become a white collar manager. Neither the salary grade level system nor job
requirements attached to each level were significantly changed through the time of study.
Employees in the firm that we study were paid relatively well. For those who were paid
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were covered by a labor union in any given year. Table 1 shows the descriptive statistics that
summarize the employee characteristics.
-----------------------------
Insert table 1 about here
-----------------------------
Data Set
Career records of 25% randomly sampled U.S. employees between 1969 and 1993 are
provided by the firm. We examine the change of wage patterns and distribution by three broad
categories of employees: blue-collared workers (who do not belong to any salary grade level),
non-exempted white collar clericals, and exempted white collar managers. Only employees
hired after 1969 are included in our analysis in order to avoid potential bias caused by left
censoring due to incomplete career information of employees hired before 1968 (Petersen, 1995).
We only include full time employees in our analysis.
In the original data set provided by the firm, a new record is added whenever there is a
career change (such as hiring, salary change, promotion, demotion, transfer, etc.) for each
employee. To transform the data into a yearly panel, we keep only the last one record for each
employee in each year. If an employee has no records in a given year, his/her record in the
previous year is used to fill forward in the missing year. Although we delete all records but the
last one for each employee in any given year, all information regarding promotion, demotion,
and bonus awarded occurred during the year are still preserved. And hence, we have a
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of 22, 187 employees: 6,555 blue collar workers (34,808 employee-year records), 9,051 white
collar clericals (46,173 records), and 6,551 white collar managers (67,276 records).
Dependent Variable
We look at the wage patterns and wage distribution in the twenty-five year period, and
hence, wage is the major dependent variable of interest. Provided in the data are the nominal
annual wages, which generates some potential problem. Since the level of annual wage depends
on both the level of hourly wage and the number of hours worked for those who are paid on
hourly basis, we only include full time employees in our study to eliminate labor supply effect.
In order to make wage distributions observed at different time comparable, all wage data are
deflated to 2007 U.S. dollars. We also take the logarithm transformation when necessary. Both
real wage and log of real wages in 2007 U.S. dollars are used in this study.
Independent and Control Variables
We use different independent variables in our analysis. The occurrence of corporate
restructuring is the major independent variable in this study, as we look at how wage patterns
and distributions changed through restructuring. More specifically, we focus our discussion on
both yearly wage patterns and pre- and post-restructuring comparison. We also regress wage at
time t+1 on wage at time t-1 controlling for wage at time tto test the existence of fast trackers.
Other control variables are defined as the following.
As noted, the firm has 24 formal salary grade levels, with additional 25% employees paid
on hourly basis and do not belong to any salary grade level. We divide all employees into three
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wage patterns across types. For each employee, we have his or her gender, race, level of
education, and union coverage. An employees firm tenure and tenure at current salary grade
level can be easily constructed given the nature of our data. Also, we calculate the frequency of
promotions that an employee has received. This is an important proxy for job performance since
the firm destroyed all performance measures once raise and promotion decisions were made.
Methods
The methods we use for empirical analysis are based on a set of both group- and
individual-level regressions (Baker et al., 1994b) and a semi-parametric variance decomposition
(DiNardo et al., 1996). We give an overview of the quantitative techniques we use here and will
explain the details when we present the results.
We largely follow the strategies in Baker, Gibbs, and Holmstrom (1994b) to test for
cohort effects, downward wage rigidities, and fast trackers. Similar procedures for firm-level
data analysis have been widely adopted in previous studies (Gibbs & Hendricks, 2004; Lin,
2005). A model suggested in Chiappori, Salani, and Valentin (1999) is also tested.
We further use a semi-parametric variance decomposition method proposed in DiNardo,
Fortin and Lemieux (1996) that can be applied to the whole distribution. Comparing to Oaxaca
decomposition (Oaxaca, 1973) that assumes that the effect of treatment (in this case firm
restructuring) is constant across the whole wage distribution, the method we use allows different
treatment effect across different segments of the wage distribution. This enables us to assess
different effects of firm restructuring at various points across wage distribution.
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------------------------------------------
Insert figures 1, 2, and 3 about here
------------------------------------------
Figures 1 through 3 replicate figure 2 in Baker, Gibbs, and Holmstrom (1994b) and show
the group wage patterns of cohort entered since 1969. The solid baseline in each graph connects
the mean starting wage of the cohort entered in each year. There is a different line deviating
from the baseline every year, each of these lines indicates the year-by-year mean wages of that
specific cohort. For example, the top-most dashed line in figure 2 indicates the year-by-year
mean wages of white collar clericals who entered the firm in 1969. Two observations emerged
from a quick inspection of figures 1 through 3. First, there is a significant cohort effect, as huge
discrepancies existed among cohorts who entered the firm in different years. A more notable
trend is the decreasing of entry wages for blue collar workers between late-1970s and mid-1980s.
Second, there is also a tenure effect, shown by the nearly parallel wage profiles of cohorts
entered at different years, especially for white collar employees. This suggests wage growths are
guided by similar rules throughout the time of study.
------------------------------------------
Insert figures 4, 5, and 6 about here
------------------------------------------
Figures 4 through 6 give a graphic presentation of wage dispersion, again by three types
of employees. The 10th
, 30th
, 50th
, 70th
, and 90th
wages percentiles in each year are shown in
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(the difference between the 90th and 50th percentiles) and lower tail inequality increased at
similar paces for white collar clericals. For white collar managers, upper tail inequality
increased faster than the lower tail side.
In the following sections, we analyze the cohort and tenure effect of wages at group level,
downward rigidity, promotion and faster-trackers, and effect of firm restructuring on wage
distribution.
Cohort and Tenure Effects
We focus only on the behavior of group wages in this section. Wages at individual level
are determined by other more complicated factors which will be explored in the following
sections. More specifically, we cluster the employees who entered the firm in the same year and
have the same firm tenure as one group and look at the mean wages of each group. It is
reasonable that group wage can be influenced by when the group entered the firm (cohort effect),
how long the group has stayed with the firm (tenure effect), and in which year the wage is
recorded (year effect). Statistically it is impossible to test these three effects separately, since
any two of these three variables (entering year, firm tenure, and year of observation) can jointly
decide the other. For example, if we observe the wage in 1990 of a cohort who entered in 1980,
this cohort must have stayed with the firm for 10 years. And hence, a regression equation with
wages as the dependent variable and entering year, firm tenure and year of observation as the
independent variables is not identifiable (Heckman & Robb, 1985). Alternatively, we follow a
similar strategy as the one in Baker, Gibbs and Holmstrom (1994b) to impose a parametric
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In table 2, we test cohort effects for three types of employees separately (blue collar,
white collar clericals, white collar managers) using the same identification strategy. In model 1,
group wages are regressed on both tenure dummies and year of observation dummies. In model
2, we remove all tenure dummies and add polynomials of firm tenure sequentially (linear,
quadratic, cubic, etc.) until model 1 is no longer statistically different than model 2. Unlike the
linear trend of tenure effect found in Baker, Gibbs and Holmstrom (1994b), we fit our wage data
with both linear and quadratic terms of tenure for white collar workers, and all linear, quadratic,
and cubic terms are used to fit the tenure trend for blue collar workers (see table 2).
Consequently, model 2 for three types of workers is slightly different. Model 2 hence controls
for both year and tenure effects as model 1 but uses a single trend for tenure effect rather than a
full set of tenure dummy variables.
-----------------------------
Insert table 2 about here
-----------------------------
In the final step, cohort dummies are add to model 2, and the regression results are shown
in model 3. Since tenure effect is controlled without using the full set of tenure dummies, the
perfect multicollinearity problem is eliminated and model 3 is identifiable. Model 3 is
significantly different when tested against model 2 for all three types of workers, implying a
statistically significant cohort effect. When the employees entered the firm will impact their
wage levels, everything else being equal. Combining with the significant polynomial of tenure
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Starting from this section, we switch our focus to individual wages. We have shown that
wages at group level are determined by cohort effect, year effect, and a uniform tenure effect.
We now examine some other factors that influence wages at individual level and could have
heterogeneous effects on workers in the same cohort-tenure group. We start with testing
downward wage rigidity.
Percentages of blue collar workers, white collar clericals, and white collar managers who
received zero nominal wage increases and negative real wage increases are tabulated in tables 3
through 5, respectively. Negative nominal increases are very rare and usually results of
demotions, so the frequencies of negative nominal increases are not listed in the table.
-----------------------------------------
Insert tables 3, 4, and 5 about here
-----------------------------------------
It should be first noticed that a non-trivial amount of workers receive zero nominal
increases throughout the 25-year period. Blue collar workers seem to be more likely to receive a
zero increase than other white collar workers. With a positive inflation rate, a zero nominal
increase actually implies a decline in real wage. As the numbers in the third columns of tables 3
through 5 would indicate, real wages are anything but downward rigid. Real wage decreases
occur because of two different reasons: a zero (or even negative) nominal wage increase, or a
positive nominal wage increase but with a growth rate lower than inflation. A brief inspection of
tables 2 through 4 lead to an observation that percentages of workers who received real wage
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percentage of workers who received zero nominal wage increase did not deviate much from
other years but percentage of those who suffered from a real wage decline rocketed. Overall, the
firm that we study did not seem to provide its employees enough protection from inflation,
especially in the years of oil crisis when inflations were high. Most of workers suffered real
wage declines.
The last columns in tables 3 through 5 provide another unique feature of the firms wage
policy. These numbers are the probabilities of an employee receiving a zero nominal wage
increase this year conditional on him or her receiving zero nominal increase in the previous year.
It is clear than an employee who received a zero nominal increase is more likely to receive zero
increase as well in the following year, since the conditional probability is usually larger than the
unconditional probability of receiving zero nominal increase in the same year. In other words,
wage increases are awarded to a certain group of workers repetitively rather than to all workers
uniformly, and these workers are more likely to be given other increases in their tenures with the
firm. This leads to our next section of analysis on promotion and fast-trackers.
Promotion and Fast-trackers
In the previous section we argue wage increases are not uniformly awarded to all
employees. An employee who received wage increase in the previous year is more likely to
receive another increase in the future. In this section we show that not only the likelihood of
wage increase is serially correlated but also the amount of wage increase.
There are nine sets of regression output in table 6. For each type (blue collar, white
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union status, current salary grade level, tenure at current salary grade level, and rate of promotion
are included as control variables. In model 3, the year when an employee entered the firm and
the year when the wage is recorded are also added as control variables.
-----------------------------
Insert table 6 about here
-----------------------------
It is clear from table 6 that after the wage in the current period is controlled, the wage in
the next period and the wage in the previous period is negatively correlated. Conditional on an
employees current wage, the lower his/her wage in the previous year, the higher his/her wage in
the next year will be. Hence, not only are wage increases given unevenly to all employees, so
are the amounts of wage increases. The evidences from table 6 and last columns in tables 3
through 5 suggest there are fast-trackers in the firm.3
Some employees receive wage increases
more likely than others, and some among those who receive wage increases more frequently
receive larger raises than the rest.
Effect of Corporate Restructuring
In order to separate the effect of firm restructuring on wage distribution from those of
other factors, we ask the question what the pre-restructuring wage distribution would have been
had employee characteristics attained the post-restructuring level.4 A semi-parametric approach
(DiNardo et al., 1996) is used to construct a counterfactual pre-restructuring wage distribution
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in which each individual employee is weighted in a way that overall employee characteristics,
such as age, gender, race, schooling, tenure, and union coverage, resemble those in the post-
restructuring level. Such counterfactual distribution is then compared to the actual post-
restructuring wage distribution to obtain the pure effect of firm restructuring on wages. And
hence, the discrepancy between the counterfactual and the actual distributions can be
interpreted as the change in wage distribution due to factors other than employee characteristics.
------------------------------------------
Insert figures 7, 8, and 9 about here
------------------------------------------
Figures 7 through 9 graphically show the results of DFL decomposition. We use the
wage distribution in 1981 as pre-restructuring distribution and the one in 1990 as post-
restructuring one. The selection of timing is somewhat arbitrary, and we choose 1981 and 1990
as the starting and end points of the whole process of corporate restructuring, which took place in
1980s. Using other start points (such as 1980 or 1982) and ending points (1989 or 1991) yields
similar results. There are three panels in each graph: the dashed line in the top-left panel denotes
the actual 1981 real wage distribution, and the solid line in the same panel denotes a weighed
real wage distribution, which is the distribution that would have prevailed if the employee
characteristics in 1981 were the same as those in 1990. The solid line in top-right panel is the
same as the solid line in top-left panel, and the dashed line is the actual real wage distribution in
1990. Finally, the difference of the two lines in top-right panel is shown in the bottom-left panel.
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observe a straight line in the bottom-left panel in figure 7. We observe some positive difference
when logarithm of real wage is around 10 (equivalent to $22,026 in 2007 dollars) and around 11
(equivalent to $59, 874 in 2007 dollars), and we also observe some negative difference when
logarithm of real wage is between 10 and 11. This indicates, conditional on worker
characteristics, less people are paid between $22,026 and $59,874 (in 2007 dollars) in 1990
compared to 1981; more people are paid around $22,026 and around $59,874 in 1990 than in
1981. Briefly, the wage distribution in 1990 is more polarized than in 1981, holding employee
characteristics constant.
Similar inspections in the bottom-left panels of figures 8 and 9 suggest the wage
distributions for white collar workers are more skewed to the left in 1990 than in 1981the firm
is more likely to pay a higher wage than a lower wage to white collar workers when employee
and job characteristics are held constant. Moreover, the discrepancy between weighted 1981 and
actual 1990 distributions is larger for white collar managers (figure 8) than for white collar
clericals (figure 9), implying the change in compensation system that inclines to reward top
performers impacted white collar managers more than white collar clericals. Overall, the change
of wage patterns for white collar workers under the semi-parametric decomposition show similar
mechanisms as the well-documented skill-biased technological change (Autor et al., 1998;
Fernandez, 2001). After corporate restructuring, wage inequality increased for all types of
employees.
DISCUSSION
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inequality through systematic wage polices. Such ability to limit wage inequality with the firm
was undermined through corporate restructuring.
We find significant cohort and tenure effects. Employees entered the firm in different
years receive very different wages. Conditional on entering wages, wage growth follow similar
patterns no matter when the employees entered the firm. Real wages were not downward rigid,
and the firm seemed not be able to keep wage growth with inflation rates especially when
inflations were high. Employees who received zero nominal wages increases in the past were
more likely to receive other zero nominal increases later in their career. The amount of wage
raises an employee received was serially correlated, suggesting the existence of fast-trackers.
A semi-parametric strategy is used to compare wage distribution before and after
corporate restructuring and implementation of performance-based compensation system.
Holding individual backgrounds and job characteristics consistent, higher wage earners were
more likely to be paid even higher after restructuring. The effect of restructuring on low wage
earners differ by types of employeeslow-paid blue collar employees were paid even lower
after restructuring, while the whole wage distribution shifted rightward with a flatter upper tail
for white collar employees. In brief, the wage inequality increased after restructuring, indicating
the firms power to reduce wage inequality was declining through corporate restructuring and
market pressure.
Limitations
The issue of external validity and generalizability inevitably rises when we draw
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idiosyncrasies in wage policies and how wage patterns are influenced; we do not intend to
conclude whatwill
happen in a certain context, alternatively, our findings provide possible
explanations to what happened in the past and also can be used to infer what may happen under
similar circumstances in the future.
As noted before, the lack of performance measures in our data also handicapped our
ability to quantitatively test how much of the change in the wage patterns can be attributed to the
introduction of performance-based compensation. Nevertheless, we tried two indirect strategies.
First, preliminary results not reported here indicate that the impact of firm tenure on wages
decreased after restructuring. This confirms that wages were less dependent on firm tenure after
the firm introduced a performance-based compensation system. Also, holding explanatory
powers of other control variables constant, a decreasing impact of firm tenure implies an
increasing impact of performance on wage determination. Alternatively, we tried to implement a
proxy of performance. Assuming wage changes are caused by the change in job characteristics
(such as salary grade level) and change in performances. The residual in the regression of wage
changes on change of job characteristics should be composed of both changes in performance
and regression errors, which then can be seen as a noisy measure of performance change. We do
find the returns to this noisy measure increased after corporate restructuring. This is our second
indirect way to test the effect of the new compensation system on wages.
Conclusion
In this study we address the changing of a firms role in shaping wage patterns, especially
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market within the firm, which in turn increased the effect of market forces on wage structure.
While some features of internal labor market were preserved through corporate restructuring, we
also observe a more polarized wage structure. The firm was more inclined to reward high
performers and pay the new hires at lower wages.
We conclude that the ability of the firm to limit wage inequality through its internal labor
market mechanisms was substantially weakened through restructuring, as market power
prevailed and altered the firms wage policies. Employment outcomes relied more on market
conditions than on firm rules. Although firm hierarchies still was and continued to be an
important factor that determines wage structure, we suggest there are increasing individual
idiosyncrasies in wage patterns and employees were less likely to shielded from market risks and
chances by the firm.
Our findings also have potential implications on current economic crisis. Downsizing
and wage cuts happened since mid-2007 resemble what occurred to the firm we study through
reduction in forces and wage restructuring in the pressure of economic efficiency. On the one
hand, we would hence expect an increasing wage inequality among the workers who manage to
stay with the same employer through current economic crisis. On the other hand, albeit the
public opinion on the media to re-establish and re-regulate economic order, we doubt if firms can
regain its ability to limit wage inequality after market forces have penetrated into firm structures
for so many years.
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Figure 1: Salary Paths by Cohort, Blue Collar Workers
2
0000
30000
400
00
50000
60000
1970 1975 1980 1985 1990 1995Year
Salary Paths for Each Cohort (Blue Collar Workers)
Figure 2: Salary Paths by Cohort, White Collar Clericals
35000
40000
45000
50000
55000
Salary Paths for Each Cohort (White Collar Clericals)
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Figure 3: Salary Paths by Cohort, White Collar Managers
6000
0
80000
100000
120000
1970 1975 1980 1985 1990 1995Year
Salary Paths for Each Cohort (White Collar Managers)
Figure 4: Wage Dispersion of Blue Collar Workers, 1969-1993
9.5
10
10
.5
11
Log
Rea
lAnnua
lWage
Wage Dispersion of Blue Collar Workers
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Figure 5: Wage Dispersion of White Collar Clericals, 1969-1993
10
10
.2
10.4
10
.6
10
.8
11
Log
Rea
lAnnua
lWage
1970 1975 1980 1985 1990 1995Year
10th Percentile 30th Percentile50th Percentile 70th Percentile
90th Percentile
Wage Dispersion of White Collar Clericals
Figure 6: Wage Dispersion of White Collar Managers, 1969-1993
10
.8
11
11.2
11
.4
11
.6
11
.8
Log
Rea
lAnnua
lWage
Wage Dispersion of White Collar Managers
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Figure 7: DFL Decomposition for Blue Collar Workers, 1981 versus 1990
0
1
2
3
4
Dens
ity
9 10 11 12Log Real Wages
1981 Weighted 1981
0
1
2
3
Dens
ity
9 10 11 12Log Real Wages
1990 Weighted 1981
-.4
-.2
0
.2
.4
D
ifference
inDens
ities
9 10 11 12Log Real Wages
DFL Decomposition for Blue Collar Workers
Figure 8: DFL Decomposition for White Collar Clericals, 1981 versus 1990
0
.5
1
1.5
Dens
ity
9.5 10 10.5 11 11.5Log Real Wages
1981 Weighted 1981
0
.5
1
1.5
Dens
ity
9.5 10 10.5 11 11.5Log Real Wages
1990 Weighted 1981
.2
.4
Dens
ities
DFL Decomposition for White Collar Clericals
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Figure 9: DFL Decomposition for White Collar Managers, 1981 versus 1990
0
.5
1
1.5
Dens
ity
10 11 12 13Log Real Wages
1981 Weighted 1981
0
.5
1
1.5
Dens
ity
10 11 12 13Log Real Wages
1990 Weighted 1981
-.4
-.2
0
.2
D
ifference
inDens
ities
10 11 12 13Log Real Wages
DFL Decomposition for White Collar Managers
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Table 1: Descriptive Statistics
Blue Collar Workers White Collar Clericals White Collar ManagersYear Real
WageTenure(Year)
AgeRealWage
Tenure(Year)
AgeRealWage
Tenure(Year)
Age
1969 $44,072 0.62 42 $35,426 0.60 31 $73,869 0.62 401970 $45,630 1.13 42 $35,177 1.16 31 $73,926 1.38 391971 $49,870 1.81 41 $38,045 1.81 32 $80,341 2.22 391972 $50,899 2.51 41 $38,551 2.43 32 $82,410 3.01 391973 $51,593 3.01 39 $38,121 2.60 31 $82,533 3.60 39
1974 $49,960 3.27 36 $37,681 2.70 31 $85,092 3.96 381975 $53,014 3.57 35 $38,302 3.28 31 $82,517 4.63 371976 $54,422 3.73 34 $38,825 3.56 31 $84,393 4.85 371977 $54,279 3.86 33 $37,856 3.78 31 $83,222 5.20 361978 $55,512 4.21 33 $37,690 3.92 31 $83,174 5.42 351979 $59,398 4.33 33 $36,807 4.01 31 $80,569 5.58 351980 $50,749 4.41 32 $34,915 3.91 31 $75,768 5.49 341981 $50,319 4.53 33 $35,607 3.86 31 $78,053 5.47 34
1982 $51,019 5.03 33 $37,660 4.43 32 $83,540 5.96 341983 $51,510 5.73 34 $38,589 5.05 32 $86,327 6.72 351984 $49,928 6.19 35 $37,648 5.52 33 $86,503 7.62 351985 $46,155 6.17 34 $37,691 5.85 34 $87,692 8.02 361986 $45,417 6.69 35 $38,739 6.68 34 $89,830 8.84 361987 $44,816 7.06 35 $38,551 7.05 35 $89,264 9.35 361988 $43,748 7.08 35 $38,212 6.55 35 $89,406 9.43 371989 $43,179 7.44 36 $37,822 6.49 35 $88,416 9.49 37
1990 $43,446 7.74 36 $38,620 6.71 35 $88,265 9.70 371991 $44,140 8.36 37 $39,557 6.95 36 $90,218 10.06 371992 $45,180 9.14 38 $40,189 7.70 37 $91,902 10.79 381993 $46,207 9.32 39 $40,894 7.83 37 $93,341 11.04 38
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Table 2: Testing Cohort Effect5
Dependent Variable: Mean Wage by Entering Cohort and Tenure GroupsBlue Collar Workers White Collar Clericals White Collar Managers
Model 1 Model 2 Model 3 Model 1 Model 2 Model 3 Model 1 Model 2 Model 3
Intercept44072.1**(3017.72)
44072.1**(3022.17)
44072.1**(1922.20)
35426.0**(2284.89)
35426.0**(2249.96)
35426.0**(1729.68)
73869.5**(3803.29)
73869.5**(3724.93)
73869.5**(2288.59)
Tenure --3411.10**(208.06)
3573.34**(150.79)
--1619.23**
(72.92)1534.66(91.09)
--3470.67**(120.73)
3080.84**(120.53)
Tenure Squared ---214.74**
(23.72)-206.62**
(15.98)--
-28.38**(3.54)
-31.57(2.81)
---46.42**
(5.87)-50.40**
(3.72)
Tenure Cubed -- 4.86**(0.74) 4.94**(0.50) -- -- -- -- -- --
Year of RecordDummies
Yes Yes Yes Yes Yes Yes Yes Yes Yes
TenureDummies
Yes No No Yes No No Yes No No
Entering CohortDummies
No No Yes No No Yes No No Yes
R-Squared 0.8381 0.8253 0.9348 0.8934 0.8884 0.9391 0.9453 0.9433 0.9803
Change in R2
Compared toModel 2
0.0128 -- 0.1095** 0.0050 -- 0.0507** 0.0020 -- 0.0370**
F-statisticsCompared to
Model 2
1.04 -- 18.13 0.59 -- 9.97 0.45 -- 22.37
5 Standard errors are in the parentheses. ** if p
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Table 3: Probability of Zero or Negative Wage Increases, Blue Collar Workers
Percent receiving a:Year
Zero nominal increase Negative real increaseConditional Probability6
1970 13.73 49.54 --1971 10.39 11.54 46.931972 10.33 11.96 76.661973 11.92 13.12 69.731974 11.03 71.42 60.241975 13.20 23.38 70.121976 17.20 18.26 78.63
1977 25.17 32.38 70.251978 19.00 22.94 56.221979 18.76 81.23 76.091980 19.28 89.92 83.901981 20.44 31.87 73.441982 21.99 26.52 66.661983 14.40 17.73 39.711984 17.25 60.45 57.67
1985 37.08 74.38 52.631986 50.11 53.86 37.691987 23.19 79.17 31.511988 13.52 69.35 31.251989 17.36 70.85 57.001990 12.73 40.27 32.501991 26.22 31.55 51.541992 23.26 25.64 19.56
1993 6.86 13.62 8.49
6 The probability of receiving a zero increase this year conditional on having received a zero nominal increase last year.
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Table 4: Probability of Zero or Negative Wage Increases, White Collar Clericals
Percent receiving a:Year
Zero nominal increase Negative real increaseConditional Probability7
1970 11.95 42.62 --1971 8.57 8.92 72.971972 17.06 18.90 38.961973 11.73 13.97 24.441974 8.97 39.48 43.661975 11.53 60.68 82.001976 12.56 13.27 56.36
1977 11.31 24.28 66.331978 9.47 16.25 66.661979 9.41 55.32 70.651980 9.28 75.20 75.301981 8.99 20.46 54.711982 8.50 10.27 69.131983 7.86 11.41 61.161984 22.79 53.02 76.04
1985 8.21 23.95 24.521986 13.50 15.28 43.021987 13.12 40.31 42.851988 7.72 19.32 30.951989 9.41 33.41 46.421990 6.67 23.40 33.651991 7.01 11.07 62.021992 14.15 24.46 52.32
1993 7.69 21.04 25.49
7 The probability of receiving a zero increase this year conditional on having received a zero nominal increase last year.
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Table 5: Probability of Zero or Negative Wage Increases, White Collar Managers
Percent receiving a:Year
Zero nominal increase Negative real increaseConditional Probability8
1970 10.49 18.13 --1971 11.59 11.99 58.061972 11.06 15.17 30.761973 11.88 15.76 48.931974 4.59 14.29 42.221975 11.21 56.75 88.001976 7.61 8.38 47.85
1977 6.97 16.95 70.001978 6.90 11.44 64.761979 5.34 42.58 65.761980 6.10 65.26 87.001981 5.26 13.27 50.001982 5.62 6.83 51.351983 6.57 10.32 45.311984 25.92 44.60 44357
1985 4.03 15.93 7.871986 11.23 11.76 40.951987 9.75 37.84 26.921988 4.47 13.50 18.241989 6.17 33.58 37.501990 4.44 18.40 27.681991 4.49 7.28 54.681992 12.30 19.54 50.40
1993 5.64 16.70 22.71
8 The probability of receiving a zero increase this year conditional on having received a zero nominal increase last year.
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Table 6: Testing Fast Trackers9
Dependent Variable: Logarithm of Wage at time t+1Blue Collar Workers White Collar Clericals White Collar Managers
Model 1 Model 2 Model 3 Model 1 Model 2 Model 3 Model 1 Model 2 Model 3Logarithm of
Wage at time t-1-0.092**(0.011)
-0.076**(0.010)
-0.034**(0.012)
-0.082**(0.009)
-0.053**(0.009)
-0.037**(0.010)
-0.124**(0.007)
-0.069**(0.006)
-0.057**(0.007)
Logarithm ofWage at time t
Yes Yes Yes Yes Yes Yes Yes Yes Yes
IndividualBackgrounds
10
No Yes Yes No Yes Yes No Yes Yes
JobCharacteristics11 No Yes Yes No Yes Yes No Yes Yes
Entering CohortDummies
No No Yes No No Yes No No Yes
Year of RecordDummies
No No Yes No No Yes No No Yes
Number ofRecords
23,296 23,296 23,296 28,312 28,312 28,312 50,926 50,926 50,926
R-Squared 0.9390 0.9407 0.9485 0.9536 0.9544 0.9609 0.9697 0.9713 0.9758
Change in R2 -- 0.0017** 0.0078** -- 0.0008** 0.0065** -- 0.0016** 0.0045**
F-statistics -- 85.09 72.80 -- 34.86 79.73 -- 135.57 200.47
9 Clustered Huber-White standard errors are in the parentheses. ** if p