Sorry for a silly question but I must know the answer to the question.
I am asking this because it seems like some people do not
differentiate between monetary policy and monetary policy shock.
For example, in Smets and Wouters (2003)
(link: https://statmath.wu.ac.at/~hauser/LVs/SE_MacroEconometrics/DSGE/SmetsWouters2003JEuEcoAss_DSGE.pdf) page 3, third paragraph reads
"Third, we analyze the effects (and the uncertainty surrounding those effects) of the various structural shocks (which includes monetary policy shock) on the euro area...a temporary monetary policy tightening, associated with a temporary increase in the nominal and real interest rate, has a hump-shaped negative effect on both output and inflation as in Peersman and Smets (2001)."
To summarize their paragraph, they looked at the effects of positive monetary policy shock on economy and treating those effects as effects of a temporary monetary policy tightening (or monetary policy tightening) on economy.