Pitirim Sorokin
Pitirim Alexandrovich Sorokin (1889-01-21 – 1968-02-11) was a Russian-born American sociologist.
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- Any Organized social group is always a stratified social body. There has not been and does not exist any permanent social group which is "flat" and in which all members are equal.
- Social Mobility (1927), p. 12