Answer:
Given that,
Reserve ratio = 25%
Fed reserve bank buys (securities) from public = $4 million
and public deposits this amount into checking account
Therefore, Initial deposits = $4 million
The supply of money is directly increases by $4 million.
and
Money creating potential of banks = Initial Deposits × [tex](\frac{1}{rr} - 1)[/tex]
= 4 × [tex](\frac{1}{0.25} - 1)[/tex]
= 4 × 3
= $12 million
Hence, money creating potential of the banks is increased by $12 million.