Suppose Harry decides to go on the scorpion. Which result would be a cost?
Harry will have more fun on the scorpion than he would have had on the screaming swing. Harry will spend more ride tickets on the scorpion than he would have spent on the screaming swing.
Harry is deciding which ride to go on at the fair. He can go on either the scorpion or the screaming swing. He wants to have as much fun as possible at the fair.
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 Harry wants or needs:
Harry will spend more ride tickets on the scorpion than he would have spent on the screaming swing.