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Learning, heterogeneity, and complexity in the New Keynesian model

Calvert Jump, Robert, Hommes, Cars and Levine, Paul (2019) Learning, heterogeneity, and complexity in the New Keynesian model Journal of Economic Behavior & Organization.

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Abstract

We present a New Keynesian model in which a fraction n of agents are fully rational, and a fraction 1 - n of agents are bounded rational. After deriving a simple reduced form, we demonstrate that the Taylor condition is sufficient for determinacy and stability, both when the proportion of fully rational agents is held fixed, and when it is allowed to vary according to reinforcement learning. However, this result relies on the absence of persistence in the monetary policy rule, and we demonstrate that the Taylor condition is not sufficient for determinacy and stability in the presence of interest rate smoothing. For monetary policy rules that imply indeterminacy, we demonstrate the existence of limit cycles via Hopf bifurcation, and explore a rational route to randomness numerically. Our results support the broader literature on behavioural New Keynesian models, in which the Taylor condition is known to be a useful guide to monetary policy, despite not always being sufficient for determinacy and/or stability.

Item Type: Article
Divisions : Faculty of Arts and Social Sciences > School of Economics
Authors :
NameEmailORCID
Calvert Jump, Robert
Hommes, Cars
Levine, PaulP.Levine@surrey.ac.uk
Date : 31 July 2019
DOI : 10.1016/j.jebo.2019.07.014
Uncontrolled Keywords : Behavioural New Keynesian model; Anticipated utility; Learning; Heterogeneous expectations
Depositing User : Clive Harris
Date Deposited : 09 Aug 2019 07:26
Last Modified : 09 Aug 2019 07:26
URI: http://epubs.surrey.ac.uk/id/eprint/852384

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