Suppose Edward decides to eat the crackers. Which result would be a cost?

 - Edward will get to eat the crackers. The crackers will be healthier than the peach cobbler would have been.
 - Edward will give up the chance to eat the peach cobbler. Edward thinks peach cobbler would have tasted better than crackers will.
This result is a cost. It involves giving up or spending something that Edward wants or needs:
Edward will give up the chance to eat the peach cobbler. Edward thinks peach cobbler would have tasted better than crackers will.