In their classic study of social mobility in the United States,Peter Blau and Otis Dudley Duncan found that:
A) vertical mobility was uncommon
B) there has been little upward mobility
C) the rags-to-riches story was quite common
D) most mobility in the twentieth century was exchange
E) educational attainment plays a major factor in occupational mobility

Question

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Peter Blau and Otis Dudley Duncan found that educational attainment plays a major factor in occupational mobility. They also found that vertical mobility was uncommon, and most mobility in the twentieth century was exchange. They did not find that the rags-to-riches story was quite common, and while there has been some upward mobility, they did not conclude that there has been little upward mobility.

In Their Classic Study of Social Mobility in the United