Abstract
Abstract This article provides new insights into market competition between traditional exchanges and alternative trading systems in Europe. It investigates the relationship between the trading activity of a crossing network (CN) and the liquidity of a traditional dealer market (DM) by comparing data from the SEAQ quote‐driven segment of the London Stock Exchange (LSE) and internal data from the POSIT crossing network. A cross‐sectional analysis of bid‐ask spreads shows that DM spreads are negatively related to CN executions. Risk‐sharing benefits from CN trading dominate fragmentation and cream‐skimming costs. Further, risk‐sharing gains are found to be related to dealer trading in the CN.
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