This paper documents the fact that in options markets, the (percentage) implied volatility bid-ask spread increases at an increasing rate as the option's maturity date approaches. To explain this stylized fact, this paper provides a market microstructure model for the bid-ask spread in options...

"The third edition of this popular textbook offers several new updates. The book presents the basics of fixed-income securities. It requires a minimum of prerequisites. The author presents a coherent theoretical framework for understanding all basic models. The author's pricing model is widely...