Suppose you have two people. Like most people, they have to use the bathroom on a regular basis.
Now suppose that they each have to pay a subscription to use the toilet in their house. For $10 a month, you can go to the bathroom twice a day.
Now, suppose one of the people goes on a diet. That diet has the net effect that they only have to go to the bathroom once a day. However, the other person has a problem: their eating habits are very poor, and really they need to go to the bathroom three times a day.
The person needing more visits to the bathroom could pay a fee and go to the bathroom. Or, the person needing fewer visits could sell their unused bathroom visits. The net use of the toilet goes down, and the person on the diet gets a little reward.
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