Floor information and common variations in liquidity

Specialists constantly update information based on the price movements of the stocks that trade nearby. The study argues that this process of changing quotes to reflect floor information may lead to contemporaneous co-variation in liquidity measures. The evidence indicates that individual stock liquidity co-varies with liquidity of the portfolio of stocks that trade in its proximity apart from the information reflected by market liquidity variation. Further tests indicate that the degree of commonality in liquidity decreases with the distance between different trading locations.