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(2007) investigated the drivers of commodity prices, Clark and Terry (2010) estimated Bayesian VAR, thus VAR which allows that both coefficient drift and stochastic volatility helps to investigate the pass through channel from commodity price inflation to core inflation.
While the inclusion of CPI serves to investigate the transitory effect of commodity shock, the effect on core inflation is also investigated as the persistent effect on inflation.
The economic argument for investigating the effect on core inflation is that CPI is likely to be subject to disruptions in supply.
The rationale behind using core inflation together with headline inflation is that the inclusion of core inflation is assumed to provide a better picture of the existing underlying inflation pressures from commodities.
There are three different methods of measuring the core inflation: standard core measures, trimmed means and volatility weighting.
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