How to distinguish between public and private goods? 这个是问答题,

How to distinguish between public and private goods? 这个是问答题,不是翻译,请用英文回答,谢谢~

简略版ExcludableNon-excludableRivalrousPrivate goods
food,clothing,cars,personal electronicsCommon goods (Common-pool resources)
fish stocks,timber,coalNon-rivalrousClub goods
cinemas,private parks,satellite televisionPublic goods
free-to-air television,air,national defense
啰嗦版
In economics,a public good is a good that is both non-excludable and non-rivalrous in that individuals cannot be effectively excluded from use and where use by one individual does not reduce availability to others.[1] Examples of public goods include fresh air,knowledge,lighthouses,national defence,flood control systems and street lighting.Public goods that are available everywhere are sometimes referred to as global public goods.
A private good is defined in economics as "an item that yields positive benefits to people"[1] that is excludable,i.e.its owners can exercise private property rights,preventing those who have not paid for it from using the good or consuming its benefits;[2] and rivalrous,i.e.consumption by one necessarily prevents that of another.A private good,as an economic resource is scarce,which can cause competition for it.[3]The market demand curve for a private good is a horizontal summation of individual demand curves.[4]'
Unlike public goods,private goods are less likely to have the free rider problem.Assuming a private good is valued positively by everyone,the efficiency of obtaining the good is obstructed by its rivalry,that is simultaneous consumption of a rivalrous good is theoretically impossible; the feasibility of obtaining the good is made difficult by its excludability,that is people have to pay for it to enjoy its benefits.[5]