Liquidity Risk, Price Impacts and the Replication Problem

Details Liquidity Risk, Price Impacts and the Replication Problem Liquidity Risk, Price Impacts and the Replication Problem

2008-12-12

arxiv.org/abs/0812.2440v2

Mathematics

Probability

Scientific paper

We extend a linear version of the liquidity risk model of Cetin et al. (2004) to allow for price impacts. We show that the impact of a market order on prices depends on the size of the transaction and the level of liquidity. We obtain a simple characterization of self-financing trading strategies and a sufficient condition for no arbitrage. We consider a stochastic volatility model in which the volatility is partly correlated with the liquidity process and show that, with the use of variance swaps, contingent claims whose payoffs depend on the value of the asset can be approximately replicated in this setting. The replicating costs of such payoffs are obtained from the solutions of BSDEs with quadratic growth and analytical properties of these solutions are investigated.

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