Internal labor markets have been explained with efficiency and control
arguments; however, retrospective event-history data from 2 7 9 organ
izations suggest that federal Equal Employment Opportunity (EEO) law w
as the force behind the spread of formal promotion mechanisms after 19
64. The findings highlight the way in which American public policy, wi
th its broad outcome-oriented guidelines for organizations, stimulates
managers to experiment with compliance mechanisms with an eye to judi
cial sanction. In response to EEO legislation and case law, personnel
managers devised and diffused employment practices that treat all clas
ses of workers as ambitious and achievement oriented in the process of
formalizing and rationalizing promotion decisions.