Examlex
How many of the 6 to 14-month-old infants tested by Walk and Gibson refused to crawl over the deep side of the visual cliff to their mothers?
Barter
Trading goods and services directly without involving money as an intermediary.
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.
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