Which one of these are considered a pure public good??

Question

Which one is the best example of a pure public good?

1. elementary and secondary education?

2. a new stadium for a baseball or football team?

3. a flood control project in a community?

4. telephone service.

I think it's 3. but please explain why you chose your answer..

Answer 1

1 and 3

Answer 2

Only 3

A public good is one that consumption of the good by one individual does not reduce availability of the good for consumption by others; and that no one can be effectively excluded from using the good. In all others people can be excluded.