Aggregating Phillips Curves

Eric Jondeau, Jean Imbs and Florian Pelgrin

No 6184, CEPR Discussion Papers from C.E.P.R. Discussion Papers

Abstract: The New Keynesian Phillips Curve is at the centre of two raging empirical debates. First, how can purely forward looking pricing account for the observed persistence in aggregate inflation. Second, price-setting responds to movements in marginal costs, which should therefore be the driving force to observed inflation dynamics. This is not always the case in typical estimations. In this paper, we show how heterogeneity in pricing behaviour is relevant to both questions. We detail the conditions under which imposing homogeneity results in overestimating a backward-looking component in (aggregate) inflation, and underestimating the importance of (aggregate) marginal costs for (aggregate) inflation. We provide intuition for the direction of these biases, and verify them in French data with information on prices and marginal costs at the industry level. We show that the apparent discrepancy in the estimated duration of nominal rigidities, as implied from aggregate or microeconomic data, can be fully attributable to a heterogeneity bias.

Keywords: Heterogeneity; Inflation persistence; Marginal costs; New keynesian phillips curve; Nominal rigidities (search for similar items in EconPapers)
JEL-codes: C10 C22 E31 E52 (search for similar items in EconPapers)
Date: 2007-03
New Economics Papers: this item is included in nep-cba and nep-mac
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Citations: View citations in EconPapers (27)

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Related works:
Working Paper: Aggregating Phillips Curves (2007)
Working Paper: Aggregating Phillips curves (2007)
Working Paper: Aggregating Phillips curves (2006)
Working Paper: Aggregating Phillips Curves (2006)
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