Disturbance theory

Disturbance theory is a political postulation by David Truman that states that interest groups form primarily when there are changes in a social environment that upsets the well-beings of some groups of people. An example could be a scarcity in resources, a change in power/policy that some people object to, etc. In addition, interest groups can form in opposition to other interest groups so as to counteract influence in their respective political domains.The theory also states that interest groups form and grow in response to threats. Robert Salisbury would later augment the theory to state that interest groups form in the absence or increasing scarcity of resources. Salisbury also argues that the leaders of such groups also hold stewardship over the future viability of the group as an "entrepreneur", in his correlative entrepreneur theory.