Abstract
The paper examines a game-theoretic model of a financial market in which asset prices are determined endogenously in terms of a short-run equilibrium. Investors use general, adaptive strategies (portfolio rules) depending on the exogenous states of the world and the observed history of the game. The main goal is to identify portfolio rules, allowing an investor to “survive,” i.e., to possess a positive, bounded away from zero, share of market wealth over an infinite time horizon. The model under consideration combines a strategic framework characteristic for stochastic dynamic games with an evolutionary solution concept (survival strategies), thereby linking two fundamental paradigms of game theory.
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Notes
See Magill and Quinzii (1996) for a textbook treatment of the subject.
See a survey in Evstigneev et al. (2009).
The state of the art in the area of research related to the Kelly investment criterion is surveyed in MacLean et al. (2011).
For textbook treatments of this class of games, see Luce and Raiffa (1989, Section A8.4) and Maitra and Sudderth (1996, Section 7.16). For more recent research on similar classes of games see Secchi and Sudderth (2001) and references therein. Related questions are discussed in Borch (1966), Shubik and Thompson (1959) and Karni and Schmeidler (1986).
In Sect. 6 we will show that the goal of survival in the present context is equivalent to the objective of winning a certain game associated with the original one (“in order to survive you have to win”).
A stochastic kernel \(p_{t}(s^{t},\varGamma )\) is a function of \(s^{t}\in S^{t}\) and a measurable set \(\varGamma \subseteq S\) such that \(p_{t}(s^{t},\varGamma )\) is a probability measure with respect to \(\varGamma \) for each \(s^{t}\) and a measurable function with respect to \(s^{t}\) for each \(\varGamma \).
An unconditional variant of the Maynard Smith’s ESS was considered by Kojima (2006).
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The authors are grateful to Yuri Kifer for fruitful discussions.
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Financial support from the Swiss National Center of Competence in Research “Financial Valuation and Risk Management” (project “Behavioural and Evolutionary Finance”), the Finance Market Fund, Norway (project “Stochastic Dynamics of Financial Markets”) and the European Commission under the Marie Curie Intra-European Fellowship Programme (grant agreement PIEF-GA-2010-274454) is gratefully acknowledged.
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Amir, R., Evstigneev, I.V. & Schenk-Hoppé , K.R. Asset market games of survival: a synthesis of evolutionary and dynamic games. Ann Finance 9, 121–144 (2013). https://doi.org/10.1007/s10436-012-0210-5
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DOI: https://doi.org/10.1007/s10436-012-0210-5