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Which of the following correctly describes someone using marginal analysis to make a decision?
Greg buys a car from a friend despite its obvious mechanical issues.
Jan decides to wear a dark wig to make herself appear different from her blonde sisters.
Marcia's boyfriend surprises her by ending their relationship when she begins an after school job at the ice cream parlor.
Even though he enjoys writing columns, Peter decreases the time he spends working for the school newspaper because his grades have fallen.
Bobby eats two chocolate chip cookies after school, and he enjoys the second cookie less than the first.