A rational decisionmaker A. ignores marginal changes and focuses instead on “the big picture.”
B. takes an action only if the combined benefits of that action and previous actions exceed the combined costs of that action and previous actions
C. ignores the likely effects of government policies when he or she makes choices
D. takes an action only if the marginal benefit of that action exceeds the marginal cost of that action

b. a single paragraph.

a paragraph is a series of sentences that are organized and make sense, and are all related to a single topic . almost every piece of writing you do that is longer than a few sentences should be organized into paragraphs. this is because paragraphs show a reader where the subdivisions of an essay begin and end, and thus the reader see the organization of the essay into subjects in order to be able to understand its main points.

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