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A private good is defined in economics as "an item that yields positive benefits to people" 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; 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.〔Hallgren,M.M.,McAdams A.K.,1995. ''A model for efficient aggregation of resources for economic public goods on the internet''. The Journal of Electronic Publishing. doi http://dx.doi.org/10.3998/3336451.0001.125〕 The market demand curve for a private good is a horizontal summation of individual demand curves. 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.〔Malkin,J. & ,Wildavasky,A.,1991. ''Why the traditional distinction between public and private goods should be abandoned''. Journal of Theoretical Politics. doi: (10.1177/0951692891003004001 )〕 One of the most common ways of looking at goods in the economy is by examining the level of competition in obtaining a given good, and the possibility of excluding its consumption; one cannot, for example, prevent another from enjoying a beautiful view, or clean air.〔Rivalry and Excludability in Goods. (n.d.). ''Living Economics''. Retrieved October 22, 2011 from http://livingeconomics.org/article.asp?docId=239〕 == Example of a private good == An example of the private good is bread: bread eaten by a given person cannot be consumed by another (rivalry), and it is easy for a baker to refuse to trade a loaf (exclusive). To illustrate the horizontal summation characteristic, assume there are only two people in this economy and that: * Person A will purchase: 0 loaves of bread at $4, 1 loaf of bread at $3, 2 loaves of bread at $2, and 3 loaves of bread at $1 * Person B will purchase: 0 loaves of bread at $6, 1 loaf of bread at $5, 2 loaves of bread at $4, 3 loaves of bread at $3, 4 loaves of bread at $2, and 5 loaves of bread at $1 As a result, a new market demand curve can be derived with the following results: This example illustrates horizontal summation of the demand curves. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Private good」の詳細全文を読む スポンサード リンク
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