Political scientist David Truman's theory explaining why interest groups form is called

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David Truman's theory explaining why interest groups form is called disturbance theory. This theory proposes that interest groups form in response to specific issues, events, or "disturbances" that affect their members. When a group of people feel that their interests are not being represented effectively within existing political institutions, they may form an interest group to lobby for their cause.

Political Scientist David Truman's Theory Explaining Why Interest Groups Form