Public Opinion is a book by Walter Lippmann published in 1922. It is a critical assessment of functional democratic government, especially of the irrational and often self-serving social perceptions that influence individual behavior and prevent optimal societal cohesion. The detailed descriptions of the cognitive limitations people face in comprehending their sociopolitical and cultural environments, leading them to apply an evolving catalogue of general stereotypes to a complex reality, rendered Public Opinion a seminal text in the fields of media studies, political science, and social psychology.