Which of the following could not serve as commodity money?

What are the proximate causes of prosperity? How are they related to the fundamental causes of prosperity?

What will be an ideal response?

The required reserve ratio is 10 percent and Charlie deposits $3,000 in her checking account. The bank must

A) decrease reserves by $300. B) decrease reserves by $3,000. C) increase reserves by $3,000. D) increase reserves by $300. E) not change its reserves until Charlie decides to withdraw her funds.