参考答案:A: Media of exchange is perhaps the most important function of money. As long as money is a legal tender, everyone will accept it for the settlement of payments.
B: For example, an individual will accept money for the goods and services he sells and will pay for the goods and services he purchases.
A: In order to facilitate exchange, we require a commodity that can be used as a good store of value.
B: A commodity, such as cattle, could be a medium of exchange, but cattle may die tomorrow.
A: A unit of account represented by money allows us to compare the value of one commodity relative to others.
B: A dollar is a basic unit of account.
Often barriers to entry are government licensing and legal barriers.
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