Dђѡђџњіћюѡіќћ ќѓ ѡѕђ ћђѢѡџюљ іћѡђџђѠѡ џюѡђ
The neutral interest rate (rt* ) is defined as the short-term interest rate that is
consistent with full employment and the inflation target of a central bank. It has
also been defined as that interest rate that would be established if there was no
nominal rigidity (Galí, 2002) in such a way that at any time the real equilibrium
would be basically determined by the fundamentals of the economy. Therefore,
knowing the accurate value of this rate is of substantial importance for decision
making by the monetary authority. The problem is that the long-term neutral
rate is a non-observable variable, which complicates its estimation. In theory,
its value can be approximated from the estimate of a short-term interest rate
equation that depends on the fundamental variables of the economy (Taylor,
1993). Thus, to estimate this rate for the U.S., the parameters of the federal
funds interest rate equation rt can be identified and estimated as a function of
the fluctuations in the inflation gap (P P) (i.e., the difference between observed
inflation and the target inflation) and the output gap (y y) (i.e., the difference
between potential output and observed output).
Dђѡђџњіћюѡіќћ ќѓ ѡѕђ ћђѢѡџюљ іћѡђџђѠѡ џюѡђThe neutral interest rate (rt* ) is defined as the short-term interest rate that isconsistent with full employment and the inflation target of a central bank. It hasalso been defined as that interest rate that would be established if there was nonominal rigidity (Galí, 2002) in such a way that at any time the real equilibriumwould be basically determined by the fundamentals of the economy. Therefore,knowing the accurate value of this rate is of substantial importance for decisionmaking by the monetary authority. The problem is that the long-term neutralrate is a non-observable variable, which complicates its estimation. In theory,its value can be approximated from the estimate of a short-term interest rateequation that depends on the fundamental variables of the economy (Taylor,1993). Thus, to estimate this rate for the U.S., the parameters of the federalfunds interest rate equation rt can be identified and estimated as a function ofthe fluctuations in the inflation gap (P P) (i.e., the difference between observedinflation and the target inflation) and the output gap (y y) (i.e., the differencebetween potential output and observed output).
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