The Fed sets higher interest rate at each price level.
-Which ceteris paribus change could have caused the shift?:
During an inflationary level, govt. can adopt contractionary fiscal policy(Raising tax rates and decreasing govt. spending) and central bank can have contractionary monetary policy ( raising interest rates and lowering money supply ). These policies can be used with each other or in isolation.
It can be used for Inflation targeting when Central bank sets a target of inflation ( around 2%-4 %). Interest rates are increased/decreased according to this inflation levels.
Hence, aggregate demand shifting to right would have caused interest rates to go up.
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