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Optimal execution and absence of price manipulations in limit order book models

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Author Info
Aurélien Alfonsi () (CERMICS - Centre d'Enseignement et de Recherche en Mathématiques et Calcul Scientifique - Ecole Nationale des Ponts et Chaussées)
Alexander Schied (Zentrum Mathematik - TU Munich)

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Abstract

We continue the analysis of optimal execution strategies in the model for a limit order book with nonlinear price impact and exponential resilience that was considered in our earlier paper with A. Fruth. We now allow for non-homogeneous resilience rates and arbitrary trading dates and consider the extended problem of optimizing jointly over trading dates and sizes. Our main results show that, under general conditions on the shape function of the limit order book, placing the deterministic trade sizes identified in our earlier paper at trading dates that are homogeneously spaced is optimal also within the large class of adaptive strategies with arbitrary trading dates. Perhaps even more importantly, our analysis yields as a corollary that our model does not admit price manipulation strategies in the sense of Huberman and Stanzl. This latter result contrasts the recent findings of Gatheral, where, in a related but different model, exponential resilience was found to give rise to price manipulation strategies when price impact is nonlinear.

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Paper provided by HAL in its series Working Papers with number hal-00397652_v2.

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Date of creation: 22 Jun 2009
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This page was last updated on 2009-12-10.

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