Answer: Users of a shared shower in a dorm allow the shower to get nasty by failing to clean it often enough.
Step-by-step explanation:
The common good is items, things, or places shared by several people, for example, a public square or, in this case, a shared shower.
It is known as "The tragedy of the Commons" when people acting for their interests deplete, ruin or degrade goods that were for community use. It is a selfish attitude that is performed collectively.
The concept was introduced by William Forster Lloyd in 1833 and is very current today when we see that many people act selfishly destroying the natural resources of the planet. For example, by contaminating rivers and oceans.
I hope this information can help you.