Studies of exchange can contribute to understanding human behavior because, more than any other species, humans have possessions and shift them between individuals. A person can acquire an object of wealth either by producing it or exchanging for it. In the terms used by economic anthropologists, exchange takes a number of forms in social interaction. Wealth is the objective of a person's labor and is therefore culturally determined. Markets refers to a market-based economy where prices reflect supply and demand (LaLone 1982: 300), as is not to be confused with aggregated transfers of various forms occurring in marketplaces. Exchange or trade are commonly used terms for processes referred to more generally by economists as transfer or allocation (Hunt 2002). Commodities, goods, and products are used here synonymously here and do not imply exchangeability or alienability.