According to differential reinforcement theory, where does the principle influence on behaviour come from?

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Differential reinforcement theory suggests that behavior is influenced by the consequences that follow it, specifically through reinforcement (positive or negative) and punishment. Groups that control an individual's reinforcement and punishment (such as families, peer groups, or organizations) are therefore seen as the primary sources of influence on behavior according to this theory.

According to Differential Reinforcement Theory, Where Does the Principle Influence