When Federal reserve banks purchase government securities from commercial banks, they increase the reserves in the banking system and they also increase the lending ability of the commercial banks.
If the Federal reserves want to increase the reserves, what they do is to buy securities. They then make a deposit to the account held at the commercial bank.
An example is if the Feds should buy securities of 1000 dollars, the bank would be having an excess of 1000 dollars to lend.
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