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The impact of regulation on market quality

Abstract

This dissertation studies the impact of market structure changes on market efficiency and integrity. Thematically, it is concerned with the actual behaviour of market participants and their associated impact on key market variables such as the degree of liquidity, the size of trading costs, the quality of price discovery and the integrity of the market itself. The fundamental changes to the trading landscape brought about by fragmentation have significantly changed the way that many traders execute transactions. In light of the vast and complex changes that have recently occurred in markets, this thesis conducts an empirical investigation of these microstructure issues. These studies contribute to the understanding of modern markets, the health of which is integral for effective price discovery and liquidity provision. The four studies in this dissertation examine several key market microstructure issues, including: causes of the pre-bid price run-up ahead of takeover announcements; the impact high frequency trading has on market efficiency and integrity; and the effect of both the introduction and regulation of dark trading. The outcomes of these studies are comprehensively discussed and their contributions to the field are duly noted. Given the significant and rapid change occurring in current equity markets, the findings in this dissertation are relevant for market practitioners, exchange venue designers, and market regulators

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