paper

Price fluctuations from the order book perspective - empirical facts and a simple model

arXiv:cond-mat/0102518 · doi:10.1016/S0378-4371(01)00301-6

Abstract

Statistical properties of an order book and the effect they have on price dynamics were studied using the high-frequency NASDAQ Level II data. It was observed that the size distribution of marketable orders (transaction sizes) has power law tails with an exponent 1+mu_{market}=2.4 \pm 0.1. The distribution of limit order sizes was found to be consistent with a power law with an exponent close to 2. A somewhat better fit to this distribution was obtained by using a log-normal distribution with an effective power law exponent equal to 2 in the middle of the observed range. The depth of the order book measured as a price impact of a hypothetical large market order was observed to be a non-linear function of its size. A large imbalance in the number of limit orders placed at bid and ask sides of the book was shown to lead to a short term deterministic price change, which is in accord with the law of supply and demand.

To appear in proceedings of the NATO Advanced Research Workshop on Application of Physics in Economic Modelling, Prague 2001. 8 figures

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