Which of the following is an example of a product that is non-excludable and rival?

Question

Quizplus · Accepted Answer

A free concert in a park is non-excludable because it is impossible to prevent someone from listening to the music, and it is rival because the limited seating means that one person's enjoyment of the concert can limit someone else's. National defence is non-excludable but not rival, automobiles are excludable and rival, and flu vaccinations are excludable but not rival.

Which of the Following Is an Example of a Product