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Title: Market microstructure : the automated order book
Author: Creswell, Philip N.
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 2004
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This thesis examines the efficiency and implications of the market microstructure provided by the London Stock Exchange (LSE), extending the framework of O’Hara (1995), Parlour (1998) and Madhavan (2000) to accommodate the idiosyncrasies of the Stock Exchange Trading System (SETS) and the Stock Exchange Automated Quotation System (SEAQ). First, we offer a comparison of the two trading platforms using the methodology of Haung and Stoll (1996) and Venkataraman (2001) to show that the SETS order book is a more efficient platform, although it has a limited ability to cope with large orders. We compare the results with those from other exchanges described in Biais et al (1995) and De Jong et al (1995). We then give a detailed analysis of the SETS order book, the aggregate behaviour of traders, and a look at an investor’s order choice between aggressive market orders and passive limit orders. Building on theories described in Glosten (1992), Keim and Madhavan (1995), Harris and Hasbrouk (1996), Griffiths et al (2000) and Grinblatt and Keloharju (2001) we ask such questions as, when and in what way does the spread and depth vary? How do market conditions affect the choice of orders and vice versa? And how do the official order book market and the unofficial dealer market coexist? We analyse the aggressiveness of orders sent to SETS, as Beber and Caglio (2003) and Ellul et al (2003) do for the NYSE, and explain how spread, depth and asymmetry of depth affect the choice between limit orders and market orders. We find that, as the market moves from a bull phase to a bear phase, overall order activity ‘increases, the proportion of trading going through the order book increases, the quoted spread seems unaffected but the asymmetry of depth increases. We also find that daytime returns are higher during the bear market, due to the speculative nature of the continuous market (compared to the actions of the off market traders and the price set during the opening call auction). We differentiate between the behaviour of sellers and buyers; buyers are more heterogenous, and their decisions are more reliant on the time of day and market conditions. Finally we differentiate investors by trading volume and show that while medium sized traders conform to modern theory, larger traders use aggressive orders to manipulate the market and hide information, and small traders pay little attention to the method of execution.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available