The long memory of the efficient market

Details The long memory of the efficient market The long memory of the efficient market

2003-11-04

arxiv.org/abs/cond-mat/0311053v2

Physics

Condensed Matter

Other Condensed Matter

19 pages, 12 figures

Scientific paper

For the London Stock Exchange we demonstrate that the signs of orders obey a long-memory process. The autocorrelation function decays roughly as $\tau^{-\alpha}$ with $\alpha \approx 0.6$, corresponding to a Hurst exponent $H \approx 0.7$. This implies that the signs of future orders are quite predictable from the signs of past orders; all else being equal, this would suggest a very strong market inefficiency. We demonstrate, however, that fluctuations in order signs are compensated for by anti-correlated fluctuations in transaction size and liquidity, which are also long-memory processes. This tends to make the returns whiter. We show that some institutions display long-range memory and others don't.

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