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There are various ways in which individual economic units can interact (相互作用) with one another. Three basic ways may be described as the market system, the administered system and the traditional system.

In a market system individual economic units are free to interact among each other in the marketplace. It is possible to buy commodities from other economic units or sell commodities to them. In a market, transactions may take place via barter or money exchange. In a barter economy, real goods such as automobiles, and shorts are traded against each other. Obviously, finding somebody who wants to trade an old car in exchange of a sailboat may not always be an easy task. Hence the introduction of money as a medium of exchange eases transactions considerably.

An alternative to the market system is administrative control by some agency over all transactions. This agency will issue commands as to how much of each goods and service should be produced, exchanged, and consumed by each economic unit. Central planning may be one way of administering such an economy. The central plan, drawn up by the government, shows the amounts of each commodity produced by the various firms and allocated (分配) to different households for consumption.

In a tradition society, production and consumption patterns are governed by tradition: every person’s place within the economic system is fixed by parentage, religion, and custom. Transactions take place on the basis of tradition, too. People belonging to a certain group may have an obligation (义务) to care for other persons, provide them with food and shelter, care for their health, and provide for their education.
1. What is the main purpose of the passage?
A) To outline contrasting types of economic systems
B) To explain the science of economics.
C) To argue for the superiority of one economic system.
D) To compare barter and money-exchange markets.
2. In the second paragraph, the word “real” in “real goods” could best be replaced by which of the following?
A) high quality B) concrete
C) true D) complete
3. According to the passage, a barter economy can lead to ________.
A) rapid speed of transactions
B) misunderstandings
C) inflation
D) difficulties of the traders
4. According to the passage, who has the greatest degree of control in an administered system?
A) Individual households.
B) Small business
C) Major corporations
D) The government
5. Which of the following is NOT mentioned by the author as a criterion for determining a person’s place in a traditional society?
A) Family background B) Age
C) Religious beliefs D) Custom

A C D D B