“…Focusing mainly on the bid-ask spreads and quoted depths at the inside quotes, a number of studies deliver a mixed verdict on the impact of tick size reductions on market liquidity. For example, Bacidore (1997), Porter and Weaver (1997), and Chakravarty, Harris, and Wood (2001), among others, show that both the bid-ask spread and quoted depth decline after a tick size reduction. However, Ahn, Cao, and Choe (1996) and Ronen and Weaver (2001) find that after a tick reduction from eighths to sixteenths on the AMEX, the bidask spreads declined, but the market depth did not decrease.…”