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27) 27) When an economist refers to choices made "at the margin," the economist is referring to A) an individual's all-or-nothing choice concerning a specific good or activity. B) decisions based on the marginal benefits and marginal costs of small changes in a particular activity. C) decisions based only on the costs a person incurs from an activity. D) decisions based only on the benefits a person receives from an activity. E) all of the above.