Journal Title
Title of Journal: Comput Econ
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Abbravation: Computational Economics
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Authors: Domenico Colucci Vincenzo Valori
Publish Date: 2008/04/22
Volume: 32, Issue: 1-2, Pages: 3-20
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 multiagent 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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