第3 6 卷 第 5 期 上海师范大学学报(自然科学版) Vol.36,No.5
2007年10月 JournalofShanghai N orm al U niversity( N atural Sciences) 2 007,Oct.
Q u a lity s p r e a d d iffe r e n tia ls o f fix e d r a te
r isk y d e b ts in ju m p d iffu sio n m o d e ls
ZHANG Chao, ZHANG Ji-zhou
( C ollege of M athem atics and Sciences, Shanghai N orm al U niversity, Shanghai200234, China)
A bstract:
A ssum e th at the firm value V
t
follows the jum p - diffused process and the interestrate follows the H ull-
W h ite m od el. W e derive the closed form form u la for th e d efault p rem ium for fixed rate debts. Then, we study the de-
fau ltpremium for fixed rate debts when interestrate follow s th e ju m p - d iffused process, and spread the price form ulas
of default prem ium equation in the ecum enical jum p - diffused process.
Keywords:
H ull - W hite m od el; risky deb ts; ju m p diffusion process; qualityspreaddiffe re n tial
C L C num ber:
O175.2
D ocum ent code:
A
ArticleID:
1000-5137(2007)05-0010-05
R eceived date: 2007-05-08
F o u n d a tio n ite m : S u p p orted b y th e sp e cial F u n d s for m a jo r sp ec ialties( 05D Z10 ) and D evelopm ent Funds of Shanghai
H igh er E ducation( T0401) of Shanghai E ducation C om m ittee.
B iography: ZH A N G C hao(1977 - ) , m ale, m aster, C ollege of M athem atics and Scien ces, Sh anghai N orm al U n iversity;
Z H A N G Ji-zhou ( 195 8 - ) , m ale, p rofessor, C ollege of M athem atics and Sciences, Shanghai N orm al U niv ersity .
1 In tro d u c tio n
A c o rp o ra tio n m a y ra is e c a p ita l b y is s u in g e ith e r fix e d ra te o r flo a tin g ra te d e b ts . In fix e d ra te d e b ts , th e
p a r v a lu e o f th e d e b t p a id b y th e is su e r a t m a tu rity is fix e d . A flo a tin g ra te debtissimilartoamoneymarket
account, w here the par account paid by the issuer at m aturity is the sum of principal and accrued interests.
The am ountof accrued interests depends on the realization of the stochastic in te re st ra te p ro c e s s o v e r th e life o f
th e flo a tin g ra te d e b t. It is a c o m m o n p ra c tic e fo r c o rp o ra tio n s to iss u e b o th fix e d ra te a n d flo a tin g ra te d e b ts .
The preference of fixed rate over floating rate m ay signal the m anagem ent view on possible rise of interestrate.
In d e te rm in in g th e a p p ro p ria te p ro p o rtio n o f d e b ts in to e ith e r fix e d ra te ty p e o r flo a tin g ra te ty p e , c o rp o ra te e x -
e c u tiv e s c o n s id e r fin a n c ia l a ttrib u te lik e b a la n c e sh e e t d u ra tio n , c u rrent interest rate environm ent, and peer
g ro u p p ra c tic e s . A s su m in g ju m p d iffu sio n p ro c e ss fo r th e firm v a lu e a n d V a sicek m ean reversion process for
th e in te re s t ra te , th e q u a lity s p re a d d iffe re n tia l is s tu d ie d in [ 1 ] . In th is paper,w e assum e that the interest rate
fo llo w s th e H u ll - W h ite m o d e l. W e d e riv e th e c lo s e d fo rm fo rm u la fo r th e d e fault prem ium for fixed rate debt.
T h e firm v a lu e V
t
o f th e is su e r fo llo w s th e G e o m e tric B ro w n ia n m o tio n w ith ra n d o m ju m p s . T h e governing
s to c h a stic d iffe re n tia l e q u a tio n fo r V
t
is g iv e n b y