Public Goods are (a) non-excludable; and (b) non-rival in consumption. Non-excludable means that consumers cannot be made to pay for the good or service. Non-rival in consumption means that consumption by one does not reduce the availability of the good to another. For example a stop sign.

Private Goods are the opposite. They are (a) excludable; and (b) rival in consumption. Excludable means that consumers can be made to pay for the good or service. Rival means that consumption by one does reduce the availability of the good or service to another. For example a banana.

Quasi-public goods are (a) excludable; but (b) non-rival in consumption. Using this definition (and not other definitions that you might find on the internet), please give an example of a quasi-public good. Then explain why it is (a) excludable and (b) non-rival in consumption. Please only give one example! Multiple examples will lead to loss of points.