When economists say that a good is non-excludable, they mean that?

A) everybody wants it.

B) there is no practical way to stop a person from enjoying the good.

C) more than one person can consume the good.

D) everybody is willing to pay for it.

Answer:
The answer is B.

Non-excludable means that you can't exclude people from enjoying it. For example, if you paid a band to come and perform in a public park. You could enjoy the band as could others so more than one person can enjoy the good (or service in this case). However, the important thing is that you couldn't prevent other people from also coming and listening to the band since it is in a public park where people are free to come and go (unless you put up a fence - in which case the park wouldn't be public any more).
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