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Explain about the marginalism theory

Most economists believe such that people increase an activity when they perceive the expected additional benefits as exceeding the expected extra cost, but decrease their level of an activity whenever they believe the benefits from the last few units of the activity are exceeded through the costs of such units. This theory is termed as: (1) opportunism. (2) populism. (3) satisficing. (4) marginalism. (5) behaviorism.

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