Stochastic Calculus for Finance II Steven E. Shreve 6.5 Interest Rate Models (1) 交大財金所碩一許嵐鈞.

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Presentation transcript:

Stochastic Calculus for Finance II Steven E. Shreve 6.5 Interest Rate Models (1) 交大財金所碩一許嵐鈞

Short-rate models Simplest models for fixed income markets: Risk-neutral measures & risk-neutral pricing formula: discounted assets prices are martingales. R(t) is for short-term borrowing. One factor model: R(t) determined by only 1 stochastic differential equation, cannot capture complicated yield curve behavior. 2May21, 2008

Review: discount process Discount process: Money market account price process: 3May21, 2008

Zero-coupon bond pricing formula Risk-neutral pricing formula: Zero-coupon bond pricing formula: 4May21, 2008

Yield Define the constant rate of continuously interest between time t and T as yield: equivalently, Short rate decided by (6.5.1), long rate determined by the formula above; no long rate model separately. R is given by SDE, it is a Markov process (P.267 Corollary 6.3.2) so 5May21, 2008

Find the PDE of unknown Review: P.269, principle behind Feynman-Kac Theorem:  find the martingale  take the differential  set the dt term to zero Then we will have a PDE, which can be solved numerically. Feynman-Kac Theorem: relates SDE and PDE. Numerical algorithm: converge quickly in one-dimension, and give the function g(t,x) of all (t,x) simultaneously. 6May21, 2008

Find the PDE of unknown Find the martingale: Take the differential: Set dt term to zero: 7May21, 2008 Terminal condition:

Hull-White interest model SDE of R(t): so PDE for the zero coupon bond: Guess the solution has the form: (verify later) C(t, T) and A(t, T) are nonrandom functions to be determined 8May21, 2008

Hull-White interest model Yield: (constant rate of continuously interest between time t and T) is an “affine” function Hull-White model is a special case of “affine yield function”. 9May21, 2008

Hull-White interest model Substitute into (6.5.6), The equation must hold for all r, so substitute back into (6.5.7), then 10May21, 2008

Hull-White interest model The ODE and the terminal condition (because (6.5.5)holds for all r) can solve In conclusion, we have an explicit formula for the price of a zero-coupon bond as a function of R(t) in Hull-White model: 11May21, 2008

Exercise 6.3 ( Solution of Hull-White model) May21,

Exercise 6.3 ( Solution of Hull-White model) May21,

Exercise 6.3 ( Solution of Hull-White model) May21,