Suppose Liz decides to go as a ghost. Which result would be a cost?
Liz will spend some time and money to get the costume. Liz will get to wear the costume she is more excited about.
Liz is deciding whether to go as a ghost or a superhero to a costume party. She would rather go as a ghost. But she already has a superhero costume.
Before you decide to do something, it is often helpful to list costs and benefits.
Costs are what you give up or spend when you decide to do something. Costs involve giving up things that you want or need.
Benefits are what you gain or save when you decide to do something. Benefits involve gaining something that you want or need.
This result is a cost. It involves giving up or spending something that Liz wants or needs:
Liz will spend some time and money to get the costume.