DERIVING THE
LM
CURVE
In Keynes s analysis, the level of interest rates is deter-
mined by equilibrium in the market for money (when the quantity of money
demanded equals the quantity of money supplied). Figure 22-8 depicts what hap-
pens to equilibrium in the market for money as the level of output changes.
Because the
LM
curve is derived holding the money supply at a fixed level, it is
fixed at the level of
, in panel (a).
7
Each level of aggregate output has its own
money demand curve because as aggregate output changes, the level of transac-
tions in the economy changes, which in turn changes the demand for money.
M
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