So stabilisation in response to
aggregate demand shocks can be perfect, if the central bank wants it to be.
But firms who change their prices twice as frequently should only get half the weight; because they can adjust to
aggregate demand shocks twice as easily, and have only half the need for the central bank to adjust aggregate demand so they don't have to change prices.
The nominal exchange rate would have to return to its long run value following
an aggregate demand shock.
Not exact matches
If the Fed were to respond to weaker real output resulting from a negative supply
shock by taking actions to stimulate
aggregate demand, higher inflation would be the ultimate result, not higher real output.
This puzzle generated a flurry of research and several Nobel prizes, and one of the things that came out is that increasing
aggregate demand (expansionary fiscal policy and or expansionary monetary policy) will not offset a negative productivity
shock.
The whole point of inflation forecast targeting is that the Bank of Canada does not «accommodate» any
shock to
Aggregate Demand that would change its internal forecast of future output and hence future inflation.
The Bank is supposed to respond to new information about any
shock to
Aggregate Demand to prevent that
shock affecting its forecast of inflation, whether that
shock is positive or negative.