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Aggregating Phillips Curves

  • Imbs, Jean
  • Jondeau, Eric
  • Pelgrin, Florian

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.

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Paper provided by C.E.P.R. Discussion Papers in its series CEPR Discussion Papers with number 6184.

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Date of creation: Mar 2007
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Handle: RePEc:cpr:ceprdp:6184
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