Fixed-income investors and traders need to understand how much risk they are taking and what they will earn from each security as they buy and sell bonds. Option-adjusted spread (OAS) analysis is a powerful analytical tool for making these assessments, superior to the more commonly used yield analysis, which can produce erratic results. Yet many hesitate to learn OAS because it is conceptually more difficult than yield analysis. This book, now in its third edition, solves that problem with its clear, plain-English presentation of the thinking behind OAS, which enables nonmathematicians to master the concepts quickly.