If the Central Bank of Macroland puts an additional 1,000 dollars of currency into the economy, the public deposits all currency into the banking system, and banks have a desired reserve/deposit ratio of 0.10, then the banks will eventually make new loans totaling and the money supply will increase by .

the banks will eventually make new loans totaling 9,000 and the money supply will increase by 10,000

Explanation:

The money multiplier is 1/0.10= 10. If 1,000 new dollars of currency are deposited in the banks, they must hold $100 as required reserves and can lend out $900. Through the money multiplier, loans will increase by $900*10= $9000. The expansion of the money supply is the original deposit + the increase in loans or $1,000+ $9,000= $10,000

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