Money is something you've been familiar with throughout your life. In fact, you may already consider yourself an expert on the subject. You regularly use money to measure the value of things you own. . It might surprise you to learn that there's a great deal of disagreement among economists about what money is and how to measure it. Money serves a number of functions, and any definition of money must consider all of its functions.
A Medium of Exchange
Money rules out the need for barter （等价交换）， the direct exchange of one item for another. Barter is a very inconvenient means of trading. . A seller with a goods or service to offer must search for a buyer who has exactly what the seller desires.
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Money provides a unit of account. The value of an item is a measure of what a person will sacrifice to obtain it. How much is a two-week vacation in Hawaii worth to you? If you're like most people, you'll probably respond to such a question by valuing the vacation in dollars -approximately $2, 000- rather than in terms of other things like your car）.
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A Standard of Deferred Payment（赊账）
. The unit of account for deferred payment of debts is also money. If you borrow money to buy a car, the loan contract specifies how much you must pay baek every month and the number of months required to fulfill your duty.
A. A Standard of Value
B. An Account of Wealth
C. You're constantly valuing items in dollars
D. It requires the double coincidence of wants
E. Money can be quickly transformed into goods and services
F. You also have some of it in your pocket and in bank accounts
G. Many contracts involve promises to pay sums of money in the future
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