Suppose Dalton decides to bake pumpkin muffins. Which result would be a cost?

 - Dalton will give up some muffins. He could have made more poppy seed muffins than pumpkin muffins.
 - Dalton will get to eat pumpkin muffins. He thinks pumpkin muffins are tastier than poppy seed muffins.
This result is a cost. It involves giving up or spending something that Dalton wants or needs:
Dalton will give up some muffins. He could have made more poppy seed muffins than pumpkin muffins.