<em>Public goods </em>are not supplied by private sector producers because they are not likely to make an economic profit.
Public goods are both non-rival and non-excludable,thus existence of a market failure is often the reason that self regulatory organizations,government or supranational institutions intervene in a particular market.Public goods display the attributes wherein sellers are unable to exclude non-buyers from using a product,as in the development of inventions that may spread freely once revealed.This can cause underinvestment because developers can not capture enough of benefits from success to make the development effort worthwhile and with economic benefit.
In 313 AD, the Emperor Constantine issued the Edict of Milan, which accepted Christianity: 10 years later, it had become the official religion of the Roman Empire.
