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  3. The values in the economic system are measured in terms of money. Our goods and services are sold for (31), and that money i

The values in the economic system are measured in terms of money. Our goods and services are sold for (31), and that money i

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问题     The values in the economic system are measured in terms of money.
    Our goods and services are sold for (31), and that money is in turn exchanged (32) other goods and services. Coins are adequate for small transactions, (33) paper notes are used for general business. There is additionally a wider sense of the word "money", covering anything (34) is used as a means of exchange, whatever (35) it may take. Originally, a valuable metal (gold, silver or copper) served (36) a constant store of value, and even today the American (37) is technically "backed" by the store of gold which the U.S. government maintains. Because gold has been universally regarded as a very valuable metal, national currencies were for many years judged in (38) of the so-called "gold standard". Nowadays, however, national currencies are considered to be as strong as the national economies which support (39).
    Valuable metal has generally been replaced by (40) notes. These notes are issued arrangements (41) as cheques and money orders which are not legal tender. They (42) the function of substitute money and are known as "instruments of credit". Credit is offered only when creditors believe that they (43) a good chance of obtaining legal tender when they present such instruments at a bank or other authorized institution. If a man’s assets are known to be considerable, then his (44) will be good. If his assets are in doubt, then it may be difficult for him to obtain large sums of credit or even to (45) for goods with a cheque.
    The value of money is basically its value as a medium of exchange, or as economists put it, its "purchasing power". This purchasing (46) is dependent on supply and demand. The demand (47) money is reckon able as the quantity needed to effect business transactions. An increase (48) business requires an increase in the amount of money coming into general circulation. But the demand for money is related not (49) to the quantity of business but also to the rapidity with which the business is (50).

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答案in
解析 考查介词用法。表示在某范围或者某个方面的增长时用介词in。而空格后紧跟着出现了相同的结构：an increase in...，这一点也可帮助考生很快确定答案。
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