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IMPACT OF TIME ILLIQUIDITY IN A MIXED MARKET WITHOUT FULL OBSERVATION
Author(s) -
Federico Salvatore,
Gassiat Paul,
Gozzi Fausto
Publication year - 2017
Publication title -
mathematical finance
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.98
H-Index - 81
eISSN - 1467-9965
pISSN - 0960-1627
DOI - 10.1111/mafi.12101
Subject(s) - bellman equation , viscosity solution , dynamic programming , market liquidity , stochastic control , asset (computer security) , market impact , consumption (sociology) , function (biology) , discrete time and continuous time , mathematical optimization , hamilton–jacobi–bellman equation , mathematical finance , value (mathematics) , mathematical economics , mathematics , optimal control , economics , computer science , market microstructure , finance , social science , statistics , computer security , evolutionary biology , order (exchange) , sociology , biology
We study a problem of optimal investment/consumption over an infinite horizon in a market with two possibly correlated assets: one liquid and one illiquid. The liquid asset is observed and can be traded continuously, while the illiquid one can be traded only at discrete random times, corresponding to the jumps of a Poisson process with intensity λ, is observed at the trading dates, and is partially observed between two different trading dates. The problem is a nonstandard mixed discrete/continuous optimal control problem, which we solve by a dynamic programming approach. When the utility has a general form, we prove that the value function is the unique viscosity solution of the associated Hamilton–Jacobi–Bellman equation and characterize the optimal allocation in the illiquid asset. In the case of power utility, we establish the regularity of the value function needed to prove the verification theorem, providing the complete theoretical solution of the problem. This enables us to perform numerical simulations, so as to analyze the impact of time illiquidity and how this impact is affected by the degree of observation.