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Example of public goods

Drinking at a public water fountain is: (w) a public good because anyone may drink from it. (x) results in a negative externality because others can’t drink from this at similar time. (y) a positive externality because you are benefiting by other’s provision of the fountain. (z) not a pure public good because when you drink you are excluding others by using the fountain.

Please guys help to solve this problem of economics with some explanation.

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