Abstract
We discuss and compare two investigation methods for the asymptotic regime of stochastic differential games with a finite number of players as the number of players tends to the infinity. These two methods differ in the order in which optimization and passage to the limit are performed. When optimizing first, the asymptotic problem is usually referred to as a mean-field game. Otherwise, it reads as an optimization problem over controlled dynamics of McKean–Vlasov type. Both problems lead to the analysis of forward–backward stochastic differential equations, the coefficients of which depend on the marginal distributions of the solutions. We explain the difference between the nature and solutions to the two approaches by investigating the corresponding forward–backward systems. General results are stated and specific examples are treated, especially when cost functionals are of linear-quadratic type.
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Paper presented at the conference “Stochastic Partial Differential Equations: Analysis, Numerics, Geometry and Modeling”, ETH Zürich, September 12–16, 2011 and the Third Humboldt-Princeton Conference, October 28–29, 2011.
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Carmona, R., Delarue, F. & Lachapelle, A. Control of McKean–Vlasov dynamics versus mean field games. Math Finan Econ 7, 131–166 (2013). https://doi.org/10.1007/s11579-012-0089-y
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DOI: https://doi.org/10.1007/s11579-012-0089-y
Keywords
- Mean-field game
- Controlled McKean–Vlasov stochastic differential equations
- Forward–backward stochastic differential equations
- Linear-quadratic
- Cap-and-trade model