Private good
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]
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.[6]
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:
| Price per loaf of bread | Loaves of bread | ||
|---|---|---|---|
| Person A | Person B | Total | |
| $6 | 0 | 0 | 0 |
| $5 | 0 | 1 | 1 |
| $4 | 0 | 2 | 2 |
| $3 | 1 | 3 | 4 |
| $2 | 2 | 4 | 6 |
| $1 | 3 | 5 | 8 |
References
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- ↑ 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
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 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
- ↑ Rivalry and Excludability in Goods. (n.d.). Living Economics. Retrieved October 22, 2011 from http://livingeconomics.org/article.asp?docId=239
