The answer is non-excludable and non-rivalrous. The public good is both non-excludable and non-rivalrous in that people can't be viable prohibited from utilizing and where use by one individual does not decrease accessibility to others.
Numerous open merchandise may on occasion be liable to over the top utilize bringing about negative externalities influencing all clients; for instance air contamination and movement blockage. Open products issues are frequently firmly identified with the "free-rider" issue, in which individuals not paying for the great may keep on accessing it. Along these lines, the great might be underproduced, abused or corrupted.
