Fast and Slow Informed Trading

64 Pages Posted: 7 Jun 2011 Last revised: 28 Feb 2019

See all articles by Ioanid Rosu

Ioanid Rosu

HEC Paris - Finance Department

Date Written: February 26, 2019


I develop a model in which traders receive a stream of private signals, and differ in their information processing speed. In equilibrium, the fast traders (FTs) quickly reveal a large fraction of their information. If a FT is averse to holding inventory, his optimal strategy changes considerably as his aversion crosses a threshold. He no longer takes long-term bets on the asset value, gets most of his profits in cash, and generates a "hot potato" effect: after trading on information, the FT quickly unloads part of his inventory to slower traders. The results match evidence about high-frequency traders.

Keywords: Trading volume, inventory, volatility, high frequency trading, price impact, mean reversion

JEL Classification: G14, D82

Suggested Citation

Rosu, Ioanid, Fast and Slow Informed Trading (February 26, 2019). AFA 2013 San Diego Meetings, Paris December 2015 Finance Meeting EUROFIDAI - AFFI, HEC Paris Research Paper No. FIN-2015-1123, Available at SSRN: or

Ioanid Rosu (Contact Author)

HEC Paris - Finance Department ( email )

1 rue de la Liberation
Jouy-en-Josas Cedex, 78351

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