SUMMARY
This study investigates commonality in liquidity in Tunisia, an order-driven, emerging stock market. We analyze the impact of information flow on the relationship between market liquidity and liquidity of securities, in addition to firm size and industry determinants. The effect of liquidity commonality on the liquidity of securities depends on firm size. The effect of market-wide commonality on liquidity is found to be stronger than that of industry-wide commonality. Our results show that public and private information flows improve liquidity. Systematic trading volume dominates systematic order imbalance in explaining liquidity; however, this effect is lesser compared to that of market liquidity.