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American higher education is currently undergoing an enormous and rapid expansion. Between 1939 and 1961 the number of students enrolled in colleges and universities and earning credits toward degrees rose from about 1.3 million to over 3.9 million (1). This three-fold increase has resulted almost completely from increasing rates of enrollment, since the population of college age—that is, the 18 to 21 year olds—was almost exactly as large in 1939 as in 1960 (2). The difference is that in 1939 college and university enrollments comprised about 14% of the 18–21 year old population, while by 1961 that figure was about 38%. This rate has been increasing at an average of 1% a year since the end of World War II.
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Martín Trow (1962) studied this question.
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