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Call Auction Transparency And Market Liquidity, Evidence From The Shanghai Stock Exchange, Gary G. Tian, Dionigi Gerace, Alex Frino

Dionigi Gerace

This paper examines the impact of pre-trade information transparency in pre-open call auction on market liquidity on the Shanghai Stock Exchange (SHSE). We examine the natural experiment affected by the Shanghai Stock Exchange in July 2006 when it changed its pre-open auction algorithm from an entirely black box into a limited transparent system with a closed order book. We find that the increase in pre-trade information transparency coincides with a statistically significant reduction in spread at the best quotes. The reduction in spread persists even after controlling for known determinants of depth. Furthermore, there is also evidence of a statistically …