“…Part of this view derives from the fact that the returns on bonds of all maturities are not perfectly correlated. 1 In addition to this simple point , a n umber of theoretical studies promote multifactor bond pricing, including Brennan and Schwartz 1979, Schaefer and Schwartz 1984, Heath, Jarrow and Morton 1988, Longsta and Schwartz 1992, and Chen and Scott 1995 others. Empirical studies of these and related models generally support the existence of multiple factors see, for example, Dai and Singleton 1997, Litterman and Scheinkman 1991, Longsta and Schwartz 1992, Stambaugh 1988, Pearson and Sun 1989, and Andersen and Lund 1997 .…”