A local restaurant offers an "all you can eat" Sunday brunch for $12 . Susan eats four servings, but leaves half of a fifth helping uneaten. Why?
a. Her marginal value of a serving of brunch has fallen below $12.
b. Her marginal value of a serving has fallen below $2.36 ($12 divided by 5 servings).
c. Her marginal value of food has fallen to zero.
d. The total value she places on brunch today exactly equals $12.
c
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