Suppose Luna decides to get the cherries jubilee ice cream. Which result would be a cost?
Luna will give up the chance to get a free waffle cone. She would have enjoyed the waffle cone. Luna will get to eat the cherries jubilee ice cream. She likes this flavor more than vanilla bean.
Luna is deciding whether to get cherries jubilee ice cream or vanilla bean ice cream. She likes cherries jubilee more than vanilla bean. But a scoop of vanilla bean ice cream comes with a free waffle cone.
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 Luna wants or needs:
Luna will give up the chance to get a free waffle cone. She would have enjoyed the waffle cone.