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Reference.org
Value-added theory
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<p>Value-added theory (also known as social strain theory) is a <a href="/facts/Sociological_theory/K1d7zCvT">sociological theory</a>, first proposed by <a href="/facts/Neil_Smelser/EMvNyfVc">Neil Smelser</a> in 1962, which posits that certain conditions are needed for the development of a <a href="/facts/Social_movement/MMt07XNv">social movement</a>. </p>