Wading Into the Deep Water of Collateralized Debt Obligations

The Economics of Structured Finance — HBS Working Knowledge: "

This paper investigates the spectacular rise and fall of structured finance. HBS professor Joshua Coval, Princeton professor Jakub Jurek, and HBS professor Erik Stafford begin by examining how the structured finance machinery works. They construct simple examples of collateralized debt obligations (CDOs) that show how pooling and tranching a collection of assets permits credit enhancement of the senior claims. They then explore the challenge faced by rating agencies, examining, in particular, the parameter and modeling assumptions that are required to arrive at accurate ratings of structured finance products. They conclude with an assessment of what went wrong and the relative importance of rating agency errors, investor credulity, and perverse incentives and suspect behavior on the part of issuers, rating agencies, and borrowers."