Dr. James Hu discusses the major changes within the mortgage market that may affect the fundamentals of mortgage securities. Some of these are: the recovery of the REMIC market after its collapse; the flourish of private-label securities; the growth of equity loan-backed securities and its establishment as a member of the fixed-income securities family. Also included are additional historical data for all exhibits. Mortgage pre-payment, dollar rolls, and private-label mortgage-backed securities are also addressed.