A Volatility And Persistence Based Core Inflation
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A Volatility and Persistence-Based Core Inflation
Author: Tito Nícias Teixeira da Silva Filho
language: en
Publisher: International Monetary Fund
Release Date: 2015-01-21
Intuitively core inflation is understood as a measure of inflation where noisy price movements are avoided. This is typically achieved by either excluding or downplaying the importance of the most volatile items. However, some of those items show high persistence, and one certainly does not want to disregard persistent price changes. The non-equivalence between volatility and (the lack of) persistence implies that when one excludes volatile items relevant information is likely to be discarded. Therefore, we propose a new type of core inflation measure, one that takes simultaneously into account both volatility and persistence. The evidence shows that such measures far outperform those based on either volatility or persistence. The latter have been advocated in the literature in recent years.
A Volatility and Persistence-Based Core Inflation
Author: Tito Nícias Teixeira da Silva Filho
language: en
Publisher: International Monetary Fund
Release Date: 2015-01-21
Intuitively core inflation is understood as a measure of inflation where noisy price movements are avoided. This is typically achieved by either excluding or downplaying the importance of the most volatile items. However, some of those items show high persistence, and one certainly does not want to disregard persistent price changes. The non-equivalence between volatility and (the lack of) persistence implies that when one excludes volatile items relevant information is likely to be discarded. Therefore, we propose a new type of core inflation measure, one that takes simultaneously into account both volatility and persistence. The evidence shows that such measures far outperform those based on either volatility or persistence. The latter have been advocated in the literature in recent years.
Measuring Core Inflation
Many alternative measures of core, or underlying, inflation have been proposed that are based on stripping out some unwanted or excessively volatile elements from the headline rate. A potential drawback of such measures is that they are necessarily atheoretic--based largely on purely statistical procedures. This paper proposes an alternative method of measuring core inflation utilizing an explicit economic definition. It defines core inflation as that part of measured inflation that has no medium or long term impact on real output--a notion that is consistent with the vertical long-run Phillips curve. This definition captures the commonly held view that moderate movements in inflation can have no impact on the real economy once financial and wage contracts have been written taking it into account. Using this definition the paper estimates a measure of core inflation using the VAR identification technique developed by Blanchard and Quah. The estimated measure indicates that core inflation was higher than measured inflation in the early 80s suggesting that measured inflation was depressed by beneficial supply shocks. The opposite effect occurred in the late 80s. Currently, core inflation is above measured inflation.