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Order aggressiveness and order book dynamics 137<br />

(bid) has a <strong>high</strong>er execution probability. S<strong>in</strong>ce the pay<strong>of</strong>f to limit orders <strong>in</strong>creases<br />

with the probability <strong>of</strong> execution, a trader who wants to sell (buy) is now more likely<br />

to submit a sell (buy) limit order <strong>in</strong>stead <strong>of</strong> a sell (buy) market order. Because <strong>of</strong> this<br />

crowd<strong>in</strong>g out <strong>of</strong> market orders on the opposite side, buy (sell) market orders are less<br />

frequent after sell (buy) market orders than after buy (sell) market orders. This<br />

trad<strong>in</strong>g behavior has been confirmed by the empirical work <strong>of</strong> Biais et al. (1995),<br />

Griffiths et al. (2000) and Ranaldo (2004). Parlour’s model also predicts that the<br />

probability <strong>of</strong> observ<strong>in</strong>g a limit buy order after the arrival <strong>of</strong> a limit buy order is<br />

smaller than the probability <strong>of</strong> observ<strong>in</strong>g a limit buy order after any other transaction.<br />

This is due to the fact that a lengthen<strong>in</strong>g <strong>of</strong> the queue at one level decreases<br />

the execution probability <strong>of</strong> further limit orders at the same level and thus makes<br />

them less attractive. Apply<strong>in</strong>g this theoretical underp<strong>in</strong>n<strong>in</strong>g, the “crowd<strong>in</strong>g out”<br />

argument implies testable relationships between changes <strong>in</strong> the depth <strong>of</strong> the book<br />

volume and their impact on traders’ <strong>in</strong>centive to post market orders, limit orders or<br />

cancellations. As a result, we can formulate the follow<strong>in</strong>g hypothesis:<br />

(1)An <strong>in</strong>crease <strong>of</strong> the depth on the ask (bid) side<br />

– <strong>in</strong>creases the aggressiveness <strong>of</strong> market trad<strong>in</strong>g on the bid (ask) side,<br />

– decreases the aggressiveness <strong>of</strong> limit order trad<strong>in</strong>g on the ask (bid) side,<br />

– <strong>in</strong>creases the probability <strong>of</strong> cancellations on the ask (bid) side.<br />

A traders’ order submission strategy does not only depend on the current state <strong>of</strong><br />

the book but also on <strong>recent</strong> movements <strong>in</strong> the price. Positive price movements<br />

dur<strong>in</strong>g the <strong>recent</strong> past <strong>in</strong>dicate an aggressiveness <strong>in</strong> buy limit orders and buy<br />

market trad<strong>in</strong>g lead<strong>in</strong>g to a relative decl<strong>in</strong>e <strong>of</strong> the ask depth compared to the bid<br />

depth. Apply<strong>in</strong>g the crowd<strong>in</strong>g out concept from Parlour’s model we can formulate<br />

Hypothesis (2) as follows:<br />

(2)Past price movements are<br />

– negatively (positively) correlated with the aggressiveness <strong>of</strong> market trad<strong>in</strong>g<br />

on the bid (ask) side,<br />

– positively (negatively) correlated with the aggressiveness <strong>of</strong> limit order<br />

trad<strong>in</strong>g on the ask (bid) side,<br />

– negatively (positively) correlated with the probability <strong>of</strong> cancellations on the<br />

ask (bid) side.<br />

Foucault (1999) proposes a dynamic equilibrium model to expla<strong>in</strong> traders’ choice<br />

between limit orders and market orders as a function <strong>of</strong> the asset’s volatility. In this<br />

model, <strong>in</strong>vestors’ valuations <strong>of</strong> shares differ and traders’ order placement strategies<br />

depend on their valuations as well as the best <strong>of</strong>fers <strong>in</strong> the book. Foucault (1999)<br />

shows that the volatility <strong>of</strong> the asset is a determ<strong>in</strong>ant <strong>of</strong> the mix between market and<br />

limit orders. S<strong>in</strong>ce <strong>high</strong>er volatility <strong>in</strong>creases the pick-<strong>of</strong>f risk, this <strong>in</strong>creases the<br />

reservation prices <strong>of</strong> limit order traders, widen<strong>in</strong>g spreads and <strong>in</strong>creas<strong>in</strong>g the cost<br />

<strong>of</strong> market trad<strong>in</strong>g. As a result traders’ <strong>in</strong>centive to post limit orders (market orders)<br />

<strong>in</strong>creases (decreases) lead<strong>in</strong>g to Hypothesis (3):<br />

(3)A <strong>high</strong>er volatility decreases the aggressiveness <strong>in</strong> market order trad<strong>in</strong>g and<br />

<strong>in</strong>creases the aggressiveness <strong>in</strong> limit order trad<strong>in</strong>g.

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