Does Output Gap, Labor's Share or Unemployment Rate Drive Inflation?
We propose a new methodology for ranking in probability the commonly proposed drivers of inflation in the New Keynesian model. The approach is based on Bayesian model selection among restricted VAR models, each of which embodies only one or none of the candidate variables as the driver. Simulation experiments suggest that our procedure is superior to the previously used conventional pairwise Granger causality tests in detecting the true driver. Empirical results lend little support to labor share, output gap or unemployment rate as the driver of U.S. inflation.
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