The article discusses different types of market liquidity and how they are influenced by market structures. It explains the concept of dark liquidity and its role in trading securities. The researchers explore the need for market liquidity, the impact of block liquidity, and the importance of orders in buying and selling securities. They also discuss key parameters like immediacy, depth, breadth, and resiliency in liquidity supply and demand. The findings suggest that understanding market microstructure is crucial for pricing and executing trades effectively.