What central banks can control is a base and one way they can control the base is via manipulating a particular interest rate, such as a Federal Funds rate, the overnight rate at which banks lend to one another. But they use that control to control what happens to the quantity of money. There is no disagreement.
Milton FriedmanNo central banker would disagree with the proposition that inflation is primarily a monetary phenomenon. Not one of them will disagree that every inflation has been accompanied by a rapid increase in the quantity of money and every deflation by a decline in the quantity of money.
Milton FriedmanHigher taxes never reduce the deficit. Governments spend whatever they take in and then whatever they can get away with.
Milton FriedmanThere's only one thing that all of the central banks control and that is the base, their own liability, and they can control that in various ways. They can control it directly by open market operations, buying and selling government securities or other assets, for example, buying and selling gold, or they can control it indirectly by altering the rate at which banks lend to one another.
Milton Friedman