Using a proprietary dataset of meta-orders and prediction signals, and assuming a quasi-linear impact model, we deconvolve market impact from past correlated trades and a predictable return component to elicit the temporal dependence of the market impact of a single daily meta-order, over a ten day horizon in various equity markets. We find that the impact of single meta-orders is to a first approximation universal and slowly decays to zero (or to a small value), possibly as a power-law. We show that auto-correlated order-flows and trade information contents fully accounts for the apparent plateau observed in the raw data. We discuss the possible bias introduced by the quasi-linear assumption.
@article{arxiv.1407.3390,
title = {Slow decay of impact in equity markets},
author = {X. Brokmann and E. Serie and J. Kockelkoren and J. -P. Bouchaud},
journal= {arXiv preprint arXiv:1407.3390},
year = {2014}
}
Comments
6 pages, submitted to "Market Microstructure & Liquidity"