Monetary literature remains plagued by references to money “supply” at a time when the endogeneity of money is becoming generally accepted. Money endogeneity is not a hypothesis; it is a fact, and one that has existed since a goldsmith-banker wrote out the first receipt (bank note) and handed it to a borrower (as opposed to a depositor of gold coins). The creation of money has always been endogenous, even under the Friedman-Schwartzian Monetarist fixed-money-rule model. Once this is accepted, then it is logical to refer to the quantity or stock of money, and to the supply of bank credit. The household, corporate and government sectors borrow from banks to consume (C) or invest (I), which are the major components of nominal GDP [C + I + net exports (= aggregate demand, AD)]. Domestic credit extension (DCE) thus represents the link between the monetary and real economies. Money creation is the outcome of the change in DCE; the latter, not the change in M, approximates the change in AD (there are other influences). The essence of monetary policy is that the central bank controls the (reference) prime lending rate (PR) of banks via its policy interest rate (PIR), and thereby the demand for bank credit. It controls PR in normal (ie non-QE) times by manipulating the liquidity of banks to a borrowed reserves condition (actual, close to, or threat of), in order to make the PIR effective. The causation path is clear.
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