Monetary Base (High-Powered Money)
What is Monetary Base (High-Powered Money)?
The monetary base, or high-powered money, is currency in circulation plus bank reserves, the money the central bank directly controls.
It is called 'high-powered' because each dollar of base can support a larger change in the broader money supply through the multiplier as banks lend. The base differs from M1/M2: it includes bank reserves (not in M1) but excludes the deposit expansion that reserves enable. The Fed changes the base mainly through open market operations.
Monetary Base (High-Powered Money): a worked example
Suppose currency in circulation is $90 billion and bank reserves held at the Fed are $30 billion, so the monetary base = $90 + $30 = $120 billion. With a 10% reserve requirement and no excess reserves, those reserves support deposits of $30/0.10 = $300 billion, so M1 = currency $90 + deposits $300 = $390 billion. The base is $120 billion while M1 is $390 billion, a ratio of 390/120 = 3.25. Now the Fed buys $5 billion of bonds from banks. Reserves rise to $35 billion and the base rises to $125 billion. Deposits expand to $35/0.10 = $350 billion and M1 becomes $90 + $350 = $440 billion, an increase of $50 billion, which is 10 times the $5 billion injection.
The mistake students make with monetary base (high-powered money)
The base gets confused with the money supply, so students multiply M1 by the deposit multiplier and report an impossible number. The base is the input the multiplier acts on, never the output. A subtler slip is applying the simple deposit multiplier 1/rr to the whole base. Only the reserve portion multiplies through lending: a dollar that leaves the Fed as currency in someone's wallet adds one dollar to the base and one dollar to M1, and stops there. Multiply the change in reserves, then handle any change in currency separately.
Monetary Base (High-Powered Money) questions
What is the difference between the monetary base and M1?
The monetary base equals currency in circulation plus bank reserves, while M1 equals currency in circulation plus checkable deposits and other highly liquid deposits. Reserves appear in the base but not in M1, and deposits appear in M1 but not in the base, so currency is the only item the two share. The base is what the central bank controls directly through open market operations, and M1 is the larger quantity that emerges after banks lend reserves out and deposits multiply.
Why is the monetary base called high-powered money?
Each dollar of base can support several dollars of the broader money supply, and that leverage is where the name comes from. A dollar added to bank reserves gets lent out, redeposited, and lent again, so deposits grow by a multiple of the original injection, with the reserve ratio setting the ceiling: a 10% requirement caps expansion at ten dollars of deposits per dollar of new reserves. Banks that choose to sit on excess reserves keep the actual expansion below that ceiling.
How does the Fed change the monetary base?
Open market operations are the main tool. When the Fed buys government bonds, it credits the seller's bank with newly created reserves and the base rises by the purchase amount; selling bonds drains reserves and shrinks the base. Discount window lending also adds reserves, and letting maturing bonds roll off the balance sheet subtracts them. Changing the reserve requirement does not alter the size of the base at all, it changes how much deposit expansion a given base can support.
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