“…Faced with the increasing importance of below investment-grade callable bonds, a growing body of academic literature examines the issue how to value a callable bond (Goldberg et al, 2021;François & Pardo, 2015;Lim et al, 2012;Jarrow et al, 2010;Banko & Zhou, 2010;Xie, 2009;Ben-Ameur et al, 2007;D'Halluin et al, 2001;Duffie & Singleton, 1999;Büttler & Waldvogel, 1996;Büttler, 1995;Ho et al, 1992;Hull & White, 1990Katolay et al, 1993;Brennan & Schwartz, 1977). The seminal work by Dai and Singleton (2000) can be recalled here to point out that the vast majority of prior studies have dealt with non-callable bonds, although "the majority of dollar-denominated corporate bonds are callable" (Jarrow et al, 2010).…”