We show evidence of a liquidity searching behaviour of informed investors in option listings, which was also found by … find that the option bid-ask spread may be still a good proxy for informed trading, despite of the liquidity searching … traders avoid trading in initial periods after listing dates due to the low liquidity environment), which is steeper for …

Speeding up the exchange does not necessarily improve liquidity. The price quotes of high-frequency market makers are … more likely to meet speculative high-frequency "bandits", thus less likely to meet liquidity traders. The bid-ask spread is …