问一道题：NO.PZ2018062003000148

嗨，爱思考的PZer你好：

同学你好，c选项是2.1.5知识点，原版书有相关介绍：

Precautionary money balances are held to provide a buffer against unforeseen events that might require money. Tese balances will tend to be larger for individuals or organizations that enter into a high level of transactions over time. In other words, a precautionary buffer of $100 for a company that regularly enters into transactions worth millions of dollars might be considered rather small. When we extend this logic to the overall economy, we can see that these precautionary balances will also tend to rise with the volume and value of transactions in the economy, and therefore, GDP as well.
c选项就是凑选项，其与inflation并无太大关系

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虽然现在很辛苦，但努力过的感觉真的很好，加油！