The overall labor force participation rate stood at about 60% in 1970
and about 67% in 1997. All of the growth was due to a secular increase
in female labor force participation--the rate for men actually decreased
over the period (presumably because of increased longevity and greater
numbers of men in the retired population). Teenager labor force participation
is interesting for three reasons: first, it shows much more seasonal variation
than the adult male and female rates, due to the effect of school attendance;
second, teenage labor force participation is clearly influenced by the
unemployment rate, apparently because very young workers tend to be the
last hired, first fired; third, the secular trend for teenage labor force
participation is flat--suggesting that there is nothing new in the phenomenon
of high school students working at part-time jobs.