问题
单项选择题
Medium of exchange can be defined as:（）
A. an asset that will allow people to transfer purchasing power form one period to the next.
B. an asset that can be easily and quickly converted to purchasing power without loss of value.
C. an asset that is used to buy and sell goods or services.
答案
参考答案：C
解析：
Medium of exchange can be defined as an asset that is used to buy and sell goods or services.