Becky's opportunity cost is watching "The Office" and "30 Rock".
Opportunity cost in economics is the theory of one action leading to the refusal or choosing one over the other. This means that the choice left is the opportunity cost of that person.
These television shows may be her favorites but even within them, she has preferences. And in choosing "Parks and Recreation" over "The Office" and "30 Rock" with the unavailability of her first preference, the least favorite shows are Becky's opportunity costs.
Learn more about "opportunity cost" here:
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