Abstract
How and why do interest groups originate? Two major theories have been offered by David Truman and Robert Salisbury respectively, the former explaining the phenomenon in terms of "societal disturbance," the latter in terms of entrepreneurial skill. Berry has attempted to test the two theories through a survey of eighty-three public interest groups in Washington, D.C. He concludes that in the large majority of cases Salisbury's theory has greater plausibility.

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