Final answer:
A public park best exemplifies a non-excludable and rivalrous good, as it is open to all but can become overcrowded, limiting its use for others. The correct option is a.
Step-by-step explanation:
The question asks which of the scenarios listed best exemplifies a non-excludable and rivalrous good. Non-excludable goods are those from which it is challenging or not feasible to prevent people from using, while rivalrous goods are those where one person's use diminishes the ability of another to use it. Considering this, a Public park is the best example among the given options (a) Public park, (b) Movie ticket, (c) Private car, (d) Exclusive club membership.
Movie tickets and exclusive club memberships are excludable because you can prevent people from using them if they don't pay. A private car is both excludable and rivalrous since only the owner or selected individuals can use it, and one person's use prevents others from using it simultaneously. While a public park is non-excludable since it's usually open for everyone to enjoy, it is rivalrous because there is a limit to how many people can use the space at the same time before it becomes overcrowded.