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September  2012, 17(6): 1751-1759. doi: 10.3934/dcdsb.2012.17.1751

Regularity of the free boundary for the American put option

Xinfu Chen 1, and  Huibin Cheng 2,

1. 

Department of Mathematics, University of Pittsburgh, Pittsburgh, PA 15260
2. 

Department of Mathematics and Statistics, McMaster University, Hamilton, ON L8S 4K1, Canada

Received  September 2011 Revised  November 2011 Published  May 2012

We show the free boundary of the American put option with dividend payment is $C^{\infty}$.
Keywords: Regularity, free boundary problem, American put option..
Mathematics Subject Classification: Primary: 35R35, 35B65; Secondary: 91G5.
Citation: Xinfu Chen, Huibin Cheng. Regularity of the free boundary for the American put option. Discrete & Continuous Dynamical Systems - B, 2012, 17 (6) : 1751-1759. doi: 10.3934/dcdsb.2012.17.1751
References:
[1]

E. Bayraktar and H. Xing, Analysis of the optimal exercise boundary of American option for jump diffusions,, SIAM. J. Math. Anal., 41 (2009), 825.  doi: 10.1137/080712519.  Google Scholar

[2]

A. Bensoussan, On the theory of option pricing,, Acta Appl. Math., 2 (1984), 139.   Google Scholar

[3]

A. Bensoussan & J.-L. Lions, "Application of Variational Inequalities in Stochastic Control,", Studies in Mathematics and its Applications, 12 (1982).   Google Scholar

[4]

X. Chen and J. Chadam, A mathematical analysis of the optimal boundary for American put options,, SIAM J. Math. Anal., 38 (): 1613.   Google Scholar

[5]

Xinfu Chen and J. Chadam, Analytic and numerical approximations for the early exercise boundary for American put options,, Dyn. Cont. Disc. and Impulsive Sys., 10 (2003), 649.   Google Scholar

[6]

Xinfu Chen, J. Chadam and Huibin Cheng, Non-convexity of the optimal exercise boundary for an American put option on a dividend-paying asset,, Mathematical Finance, ().   Google Scholar

[7]

Xinfu Chen, J. Chadam, L. Jiang and W. Zheng, Convexity of the exercise boundary of the American put option on a zero dividend asset,, Math. Finance, 18 (2008), 185.  doi: 10.1111/j.1467-9965.2007.00328.x.  Google Scholar

[8]

A. Friedman, "Variational Principles and Free Boundary Problems,", A Wiley-Interscience Publication, (1982).   Google Scholar

[9]

A. Friedman, "Partial Diffferential Equations of Parabolic Type,", Prentice-Hall, (1964).   Google Scholar

[10]

A. Friedman, Analyticity of the free boundary for the Stefan problem,, Arch. Rational Mech. Anal., 61 (1976), 97.  doi: 10.1007/BF00249700.  Google Scholar

[11]

L. Jiang, Existence and differentiability of the solution of a two phase Stefan problem for quasi-linear parabolic equations,, Chinese Math. Acta, 7 (1965), 481.   Google Scholar

[12]

D. Lamberton and M. Mikou, The critical price for the American put in an exponential Lévy model,, Finance Stoch., 12 (2008), 561.  doi: 10.1007/s00780-008-0073-9.  Google Scholar

[13]

P. Laurence and S. Salsa, Regularity of the free boundary of an American option on several assets,, Comm. on Pure and Appl. Math., 62 (2009), 969.  doi: 10.1002/cpa.20268.  Google Scholar

[14]

H. P. McKean, Jr., Appendix: A free boundary problem for the heat equation arising from a problem in mathematical economics,, Industrial Management Review, 6 (1965), 32.   Google Scholar

[15]

P. van Moerbeke, On optimal stopping and free boundary problems,, Arch. Rational Mech. Anal., 60 (): 101.   Google Scholar

[16]

C. Yang, L. Jiang and B. Bian, Free boundary and American option in a jump-diffusion model,, Euro. J. of Applied Mathematics, 17 (2006), 95.  doi: 10.1017/S0956792505006340.  Google Scholar

[17]

P. Wilmott, J. Dewynne and S. Howison, "The Mathematics of Financial Derivatives. A Student Introduction,", Cambridge University Press, (1995).   Google Scholar

show all references

References:
[1]

E. Bayraktar and H. Xing, Analysis of the optimal exercise boundary of American option for jump diffusions,, SIAM. J. Math. Anal., 41 (2009), 825.  doi: 10.1137/080712519.  Google Scholar

[2]

A. Bensoussan, On the theory of option pricing,, Acta Appl. Math., 2 (1984), 139.   Google Scholar

[3]

A. Bensoussan & J.-L. Lions, "Application of Variational Inequalities in Stochastic Control,", Studies in Mathematics and its Applications, 12 (1982).   Google Scholar

[4]

X. Chen and J. Chadam, A mathematical analysis of the optimal boundary for American put options,, SIAM J. Math. Anal., 38 (): 1613.   Google Scholar

[5]

Xinfu Chen and J. Chadam, Analytic and numerical approximations for the early exercise boundary for American put options,, Dyn. Cont. Disc. and Impulsive Sys., 10 (2003), 649.   Google Scholar

[6]

Xinfu Chen, J. Chadam and Huibin Cheng, Non-convexity of the optimal exercise boundary for an American put option on a dividend-paying asset,, Mathematical Finance, ().   Google Scholar

[7]

Xinfu Chen, J. Chadam, L. Jiang and W. Zheng, Convexity of the exercise boundary of the American put option on a zero dividend asset,, Math. Finance, 18 (2008), 185.  doi: 10.1111/j.1467-9965.2007.00328.x.  Google Scholar

[8]

A. Friedman, "Variational Principles and Free Boundary Problems,", A Wiley-Interscience Publication, (1982).   Google Scholar

[9]

A. Friedman, "Partial Diffferential Equations of Parabolic Type,", Prentice-Hall, (1964).   Google Scholar

[10]

A. Friedman, Analyticity of the free boundary for the Stefan problem,, Arch. Rational Mech. Anal., 61 (1976), 97.  doi: 10.1007/BF00249700.  Google Scholar

[11]

L. Jiang, Existence and differentiability of the solution of a two phase Stefan problem for quasi-linear parabolic equations,, Chinese Math. Acta, 7 (1965), 481.   Google Scholar

[12]

D. Lamberton and M. Mikou, The critical price for the American put in an exponential Lévy model,, Finance Stoch., 12 (2008), 561.  doi: 10.1007/s00780-008-0073-9.  Google Scholar

[13]

P. Laurence and S. Salsa, Regularity of the free boundary of an American option on several assets,, Comm. on Pure and Appl. Math., 62 (2009), 969.  doi: 10.1002/cpa.20268.  Google Scholar

[14]

H. P. McKean, Jr., Appendix: A free boundary problem for the heat equation arising from a problem in mathematical economics,, Industrial Management Review, 6 (1965), 32.   Google Scholar

[15]

P. van Moerbeke, On optimal stopping and free boundary problems,, Arch. Rational Mech. Anal., 60 (): 101.   Google Scholar

[16]

C. Yang, L. Jiang and B. Bian, Free boundary and American option in a jump-diffusion model,, Euro. J. of Applied Mathematics, 17 (2006), 95.  doi: 10.1017/S0956792505006340.  Google Scholar

[17]

P. Wilmott, J. Dewynne and S. Howison, "The Mathematics of Financial Derivatives. A Student Introduction,", Cambridge University Press, (1995).   Google Scholar

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