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Asset Price Dynamics When Behavioural Heterogeneity Varies

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  • Domenico Colucci
  • Vincenzo Valori

Abstract

We build a model in which asset prices are expectationally driven and agents forecast future prices hinging on a combination of fundamental value, trend and inertia. The model has a unique steady state and we investigate its stability. In particular the amount of behavioural heterogeneity in the model is given by the number of intermediaries actually operating in the market: we are concerned with the effects that changing such number produces on the steady state in terms of stability. Assuming that the set of relevant intermediaries is sampled randomly we discuss the probability of having stability as a function of the market's parameters and the number of such agents. Our simulations show that stability in the multi-agent setting does not require that conditions for stability in the representative agent case be met for every individual; so stability can arise even if some of the agents would not be compatible with it if they were the only ones operating in the market. The same goes for instability. Further, we find that stabilising (or destabilising) effects of heterogeneity are not uniform across the market's essential characteristics, as captured by a given structural parameter: in fact we can identify a parametric region in which heterogeneity is stabilising and another in which it is destabilising.
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  • Domenico Colucci & Vincenzo Valori, 2008. "Asset Price Dynamics When Behavioural Heterogeneity Varies," Computational Economics, Springer;Society for Computational Economics, vol. 32(1), pages 3-20, September.
    • Handle: RePEc:kap:compec:v:32:y:2008:i:1:p:3-20
    DOI: 10.1007/s10614-008-9129-3
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    1. Colucci, Domenico & Valori, Vincenzo, 2011. "Adaptive expectations and cobweb phenomena: Does heterogeneity matter?," Journal of Economic Dynamics and Control, Elsevier, vol. 35(8), pages 1307-1321, August.
    2. Domenico Colucci & Vincenzo Valori, 2012. "Bounded rationality and parameters’ uncertainty in a simple monetary policy model," Working Papers - Mathematical Economics 2012-03, Universita' degli Studi di Firenze, Dipartimento di Scienze per l'Economia e l'Impresa.
    3. Colucci, Domenico & Doni, Nicola & Ricchiuti, Giorgio & Valori, Vincenzo, 2022. "Market dynamics with a state-owned dominant firm and a competitive fringe," Chaos, Solitons & Fractals, Elsevier, vol. 161(C).
    4. Colucci, Domenico & Valori, Vincenzo, 2015. "Stabilizing inflation in a simple monetary policy model with heterogeneous agents," Mathematics and Computers in Simulation (MATCOM), Elsevier, vol. 108(C), pages 233-244.
    5. Domenico Colucci & Matteo Vigna & Vincenzo Valori, 2022. "Large and uncertain heterogeneity of expectations: stability of equilibrium from a policy maker standpoint," Journal of Economic Interaction and Coordination, Springer;Society for Economic Science with Heterogeneous Interacting Agents, vol. 17(1), pages 319-348, January.

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    More about this item

    Keywords

    Heterogeneous agents; Expectations; Stock market; Behavioural finance; Bounded rationality; Middlemen; G12; D84;
    All these keywords.

    JEL classification:

    • G12 - Financial Economics - - General Financial Markets - - - Asset Pricing; Trading Volume; Bond Interest Rates
    • D84 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Expectations; Speculations

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