Suppose Dustin decides to eat the grapes. Which result would be a cost?
Dustin will give up the chance to eat the oatmeal cookies. Dustin thinks oatmeal cookies would have tasted better than grapes will. Dustin will get to eat the grapes. The grapes will be healthier than the oatmeal cookies would have been.
Dustin is deciding whether to eat grapes or oatmeal cookies for an afternoon snack. He would like to eat something tasty, but he is also trying to be healthier.
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 Dustin wants or needs:
Dustin will give up the chance to eat the oatmeal cookies. Dustin thinks oatmeal cookies would have tasted better than grapes will.