Examlex
The prototype theory of categorization states that:
Barter System
An ancient method of exchange where goods and services are directly traded for other goods and services without using money.
Good
A material item that can be touched, used, or consumed, which is produced to fulfill wants or needs.
Service
A type of economic activity that is intangible, is not stored, and does not result in ownership; services are produced and consumed at the same time.
Exchange
The act of giving one thing and receiving another in return, often referring to the trade of goods, services, or financial instruments.
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