“…Following Merton's (1974) pathbreaking work, the basic structural model has been extended in different ways. 8 While these models typically focus on the importance of additional theoretical variables, or change the precise functional dependence of default on existing theoretical 8 See Black and Cox (1976), Geske (1977), Fischer, Heinkel, and Zechner (1989), Kim, Ramaswamy, andSundaresan (1993), Nielsen, Saa-Requejo, andSanta-Clara (1993), Leland (1994), Longstaff and Schwartz (1995), Anderson and Sundaresan (1996), Leland and Toft (1996), Mella-Barral and Perraudin (1997), Zhou (1997), Leland (1998), Mella-Barral (1999, Duffie and Lando (2000), , François and Morellec (2004). 5 variables, they all have in common that default and therefore the value of the default sensitive security depends on a number of determinants that are central to the Merton (1974) approach.…”