Recently, you decided to super-size your fries at McDonald's. On the one hand, your decision to super-size considered the additional costs associated with the super-size, including the additional monetary, caloric and cholesterol intake, as well as the extra time you had to wait for those fries because a new batch was being prepared. On the other hand, you determined that the extra benefits from super-sizing included a few more mouthfuls of satisfaction from an increased portion of fries. The benefits clearly outweighed the costs since you chose to super-size. Which of the following does this illustrate?

a. Marginal analysis
b. The law of demand
c. Delayed gratification
d. Diminishing marginal utility
e. Random behavior

a. Marginal analysis