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Title:Price stickiness in Ss models: new interpretations of old results PDF Logo
Authors:Caballero, Ricardo J.
Engel, Eduardo M. R. A.
Issue Date:2007
Series/Report no.:Center discussion paper // Economic Growth Center 952
Abstract:What is the relation between infrequent price adjustment and the dynamic response of the aggregate price level to monetary shocks? The answer to this question ranges from a one-to-one-link (Calvo, 1983) to no connection whatsoever (Caplin and Spulber, 1987). The purpose of this paper is to provide a unified framework to understand the mechanismus behind this wide range of results. In doing so, we propose new interpretations of key results in this area, which in turn suggest the kind of Ss model that is likely to generate substantial price rigidity. The first result we revisit is Caplin and Spulber's monetary neutrality model. We show that when price stickiness is measured in terms of the impulse response function, this result is not a consequence of aggregation, but is due instead to the absence of price-stickiness at the microeconomic level. We also show that the selection effect, according to which units that adjust their prices are those that benefit the most, is neither necessary nor sufficient to account for the higher aggregate flexibility of Ss-type models compared to Calvo models. Instead, the key concept is the contribution of the extensive margin of adjustment to the aggregate price response. The aggregate price level is more flexible than suggested by the microeconomic frequency of adjustment if and only if this term is positive,
Subjects:Aggregate price stickiness
adjustment hazard
adjustment frequency
generalized Ss model
extensive margin
Calvo model
strategic complementarities
JEL:E32
E62
Document Type:Working Paper
Appears in Collections:Center Discussion Papers, Economic Growth Center (EGC), Yale University

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