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Poverty and Inequality 623
participation increased. The relative size of the forty to forty-nine group –
which registers lower participation rates – also expanded and this tended to
reduce participation. However, because this expansion was smaller (around
8%), it was offset by the change in the thirty to thirty-nine age group. With
respect to the 1990s, female participation continued to expand, although
at a slower pace. In the 1980s, the average annual increase was 3.4 percent;
in the 1990s, it fell to 2.4 percent.
What are the forces causing the changes in the age structure that affect
the use of human capital through female labor force participation? Shifts in
age structure are mainly triggered by changes in fertility and mortality that
have taken place some years before becoming manifest. With constant age-
specific fertility and mortality rates, a population grows at a steady rate and
the age structure remains stable. However, if fertility and mortality decline
at different rates, as is the case during the stereotypical demographic transi-
tion from a high-fertility/high-mortality steady state to a low-fertility/low-
mortality steady state, population growth and dependency ratios vary. Dif-
ferences in age structures and dependency ratios across countries today are
attributable mainly to differences in fertility rates and to the varying paces
at which they have declined over time.
Decreased fertility is typically associated with increased female schooling.
Surveys of the literature on fertility repeatedly suggest that the strongest
empirical association between fertility declines and observed variables in
micro and aggregate studies is the inverse one between women’s schooling
and fertility. In a summary of the empirical literature, Birdsall finds that
female education of over four years bears one of the strongest and most
consistent negative relationships to fertility, and that empirical work has
strongly confirmed the hypothesis that parents’ education – especially a
mother’s education above the primary level – is associated with lower fertil-
ity.
27
Schultz also implies that increasing educational attainment of women
is generally associated with reduced fertility.
28
Another factor affecting fertility is health. The more precarious are health
conditions, the lower the probability of the survival of each child and,
therefore, the larger the number of pregnancies required to be able to meet
the target number of adult children. If health conditions improve, thereby
reducing infant mortality rates and increasing life expectancies, people will
27
Nancy Birdsall et al., “Why Low Inequality Spurs Growth: Saving and Investment by the Poor,” in
Andr
´
es Solimano, ed., Social Inequalities: Values, Growth and the State (Ann Arbor, MI, 1998).
28
Schultz, “Inequality in the Distribution of Personal Income in the World: How It Is Changing and
Why” (Mimeograph, Yale University, 1997).