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June 1, 2016


The Gender Earnings Gap

Women earn less, on average, than men. This earnings
differential-often called the gender earnings gap-is a
significant concern for policymakers, and it raises questions
about gender equity in labor markets as well as the
implications of the gap for national economic performance.

Figure I. Ratio of Women's to Men's Median Annual
Earnings, 1964-2014
Full-time, Year-Round Workers

100% Ratio of Median Annual Earnings




  20%


      1964     1974    1984    1994     2OW4    2014
Source: U.S. Census Bureau, Historical Income Tables, Table P-40,
at http://www.census.gov/hhes/www/income/data/historical/people/
Note: A full-time, year-round worker is a person who worked 35 or
more hours per week and 50 or more weeks during the previous
calendar year.

Figure 1 plots the ratio of women's to men's annual
median earnings from 1964 to 2014, using U.S. Census
Bureau data. This ratio is a summary measure of the gender
earnings gap, which in practice takes on a range of values
that vary across occupations and worker characteristics.
Nonetheless, Figure 1 illustrates several points of interest:

    *   Women's median annual earnings are lower than
        men's throughout the entire 1964-2014 period;

    *   The ratio of women's-to-men's median annual
        earnings rose rapidly in the 1980s and 1990s;

    *   The ratio continued to rise in recent years, but at a
        slower pace;

    *   In 2014, women's median annual earnings were
        78.6% of men's, representing a 21.4 percentage
        point gap.


Part of the earnings gap shown in Figure 1 can be
attributed to differences between men's and women's
employment patterns and other characteristics. Table 1, for
example, illustrates select differences between men's and
women's years of education, full-time work experience, and
occupations in 1981 and 2011. It shows that differences
remain in 2011, but these have narrowed considerably since
1981.


Table I. Select Worker Characteristics, by Sex
                                 Men           Women

  Worker Characteristics    1981    2011    1981    2011

  Schooling (Years)          13.3    14.3    13.2    14.5

  Full-time Work Experience  20.3    17.8    13.5    16.4
  (Years)

  Share of Workers in       21.5%   18.3%    9.2%   16.2%
  Managerial Jobs
  Share of Workers in       14.6%   18.6%   10.1%   17.8%
  Professional Jobs, Excluding
  Nurses and Teachers
Source: Francine D. Blau and Lawrence M. Kahn, The Gender Wage
Gap: Extent, Trends, and Explanations, National Bureau of Economic
Research, Working Paper no. 21913, Tables 2 and 3, January 2016,
http://www.nber.org/papers/w21913.
Note: Blau and Kahn use data from the Panel Study of Income
Dynamics, and restrict analysis to full-time non-farm wage and salary
workers, aged 25-64, with at least 26 weeks of employment.

Researchers have applied statistical techniques to large-
scale survey data to separate the observed earnings gap
(e.g., as shown in Figure 1) into its explained and
unexplained portions.

   The explained portion accounts for observed gender
   differences in factors that affect wages (e.g., education,
   occupation, work experience), assuming that those
   attributes are equally valued for men and women (i.e.,
   an MBA has the same value to an employer regardless
   of the degree-holder's sex).

   The unexplained portion is the gap that remains when
   observed characteristics are taken into account (i.e., it is
   the portion of the gap that cannot be explained by
   observed differences in education, work experience, or
   other worker characteristics).

One interpretation of the unexplained gap is that it
measures sex-based discrimination. Although research
suggests discrimination is a component, the unexplained
gap plausibly measures the impacts of many factors. This is
because all surveys that have been used to estimate the
explained and unexplained earnings gaps are limited in their
capacity to fully capture worker attributes that could affect
earnings. For example, although most surveys collect
information on employment, occupation and industry of
work, work hours, and wages, many individual
characteristics (e.g., technical knowledge, competitiveness,
interpersonal skills) and employer-specific attributes (e.g.,
job features and requirements, provision of classroom
training and mentoring) are frequently unmeasured. As a


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