如果银行的存款准备金率为10%，公众把存款中的20%作为通货持有，那么货币乘数是如果银行的存款准备金率为10%，公众把存款中的20%作为通货持有，那么货币乘数是
A、3.33 B、3 C、4 D、10
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I think the answer should be A.
Assume people have $100, and deposit the $100 into the bank. The reserve rate is 10%, which fixes $10. The 20% of money as "通货" is also fixed by people. Then only $70 is loanable. The multiplier thus is 1/(1-0.7)=3.33
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