Figure 1.
Free boundary $ z^{\star}(t) $ . Parameter values are given by $ \mu = 0.05, \sigma = 0.2, r = 0.01, \beta = 0.05, \gamma = 2, \mu_{I} = 0.012, \sigma_{I} = 0.1, \nu = 0.3 \;\;\mbox{and}\; T = 10 $
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March
2021, 17(2): 733-763.
doi: 10.3934/jimo.2019132
Finite horizon portfolio selection problems with stochastic borrowing constraints
Department of Applied Mathematics & Institute of Natural Science, Kyung Hee University, Yongin, 17104, Republic of Korea |
In this paper we investigate the optimal consumption and investment problem with stochastic borrowing constraints for a finitely lived agent. To be specific, she faces a credit limit which is a constant fraction of the present value of her stochastic labor income at each time. By using the martingale approach and transformation into an infinite series of optimal stopping problems which has the same characteristic as finding the optimal exercise time of an American option. We recover the value function by establishing a duality relationship and obtain the integral equation representation solution for the optimal consumption and portfolio strategies. Moreover, we provide some numerical illustrations for optimal consumption and investment policies.
Keywords:
Consumption and investment,
stochastic borrowing constraint,
stochastic income,
optimal-stopping problem,
variational inequality,
martingale method.
Mathematics Subject Classification:
Primary: 91G10, 91G80; Secondary: 90C15.
Citation:
Junkee Jeon. Finite horizon portfolio selection problems with stochastic borrowing constraints. Journal of Industrial and Management Optimization,
2021, 17
(2)
: 733-763.
doi: 10.3934/jimo.2019132
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References:
| [1] |
M. Abramowitz and I. Stegun, Handbook of Mathematical Functions With Formulas, Graphs, and Mathematical Tables, National Bureau of Standards Applied Mathematics Series, 55, 1964. |
| [2] |
S. Ahn, K. J. Choi and B. H. Lim,
Optimal consumption and investment under time-varying liquidity constraints, J. Financial and Quantitative Anal., 54 (2019), 1643-1681.
doi: 10.1017/S0022109018001047. |
| [3] |
A. Bensoussan, B. G. Jang and S. Park,
Unemployment risks and optimal retirement in an incomplete market, Oper. Res., 64 (2016), 1015-1032.
doi: 10.1287/opre.2016.1503. |
| [4] |
K. Choi, K. Koo, B. H. Lim and J. Yoo, Limited commitment, business cycle, and portfolio selection, preprint. Available at SSRN: https://ssrn.com/abstract=2560607.
doi: 10.2139/ssrn.3230235. |
| [5] |
K. Choi, G. Shim and Y. Shin,
Optimal portfolio, consumption-leisure and retirement choice problem with CES utility, Math. Finance, 18 (2008), 445-472.
doi: 10.1111/j.1467-9965.2008.00341.x. |
| [6] |
J. F. Cocco, F. J. Gomes and P. J. Maenhout,
Consumption and portfolio choice over the life cycle, Review of Financial Studies, 18 (2005), 491-533.
doi: 10.1093/rfs/hhi017. |
| [7] |
J. Cox and C. Huang,
Optimal consumption and portfolio polices when asset prices follow a diffusion process, J. Econom. Theory, 49 (1989), 33-83.
doi: 10.1016/0022-0531(89)90067-7. |
| [8] |
P. Dybvig and H. Liu,
Lifetime consumption and investment: Retirement and constrained borrowing, J. Econom. Theory, 145 (2010), 885-907.
doi: 10.1016/j.jet.2009.08.003. |
| [9] |
P. Dybvig and C. Rogers, High hopes and disappointment, preprint. |
| [10] |
M. El Karoui and M. Jeanblanc-Picqué,
Optimization of consumption with labor income, Finance and Stochastics, 2 (1998), 409-440.
doi: 10.1007/s007800050048. |
| [11] |
E. Farhi and S. Panageas,
Saving and investing for early retirement: A theoretical analysis, J. Financial Econom., 83 (2007), 87-121.
|
| [12] |
A. Friedman,
Parabolic variational inequalities in one space dimension and smoothness of the free boundary, J. Functional Analysis, 18 (1975), 151-176.
doi: 10.1016/0022-1236(75)90022-1. |
| [13] |
A. Friedman, Variational Principles and Free-boundary Problems, Pure and Applied Mathematics, John Wiley & Sons, Inc., New York, 1982. |
| [14] |
J. Harrison, Brownian motion and stochastic flow systems, Wiley Series in Probability and Mathematical Statistics, John Wiley & Sons, Inc., New York, 1985. |
| [15] |
H. He and H. Pagés,
Labor income, borrowing constraints, and equilibrium asset prices, Econom. Theory, 3 (1993), 663-696.
doi: 10.1007/BF01210265. |
| [16] |
J. Z. Huang, M. G. Subrahmanyam and G. G. Yu,
Pricing and hedging American options: A recursive integration method, Review of Financial Studies, 9 (1996), 277-300.
doi: 10.1093/rfs/9.1.277. |
| [17] |
I. Karatzas, J. Lehoczky and S. Shreve,
Optimal portfolio and consumption decisions for a ``small investor" on a finite horizon, SIAM J. Control Optim., 25 (1987), 1557-1586.
doi: 10.1137/0325086. |
| [18] |
I. Karatzas and S. Shreve, Methods of Mathematical Finance, Applications of Mathematics, 39, Springer-Verlag, New York, 1998.
doi: 10.1007/b98840. |
| [19] |
H. Koo,
Consumption and portfolio selection with labor income: A continuous time approach, Math. Finance, 8 (1996), 49-65.
doi: 10.1111/1467-9965.00044. |
| [20] |
N. V. Krylov, Controlled Diffusion Processes, Applications of Mathematics, Springer-Verlag, New York, 1980. |
| [21] |
H. K. Liu,
Properties of American volatility options in the mean-reverting $3/2$ volatility model, SIAM J. Financial Math., 6 (2015), 53-65.
doi: 10.1137/130924573. |
| [22] |
R. Merton,
Lifetime portfolio selection under uncertainty: The continuous-time case, Review of Econom. and Statistics, 51 (1969), 247-257.
doi: 10.2307/1926560. |
| [23] |
R. Myneni,
The pricing of the American option, Ann. Appl. Probab., 2 (1992), 1-23.
doi: 10.1214/aoap/1177005768. |
| [24] |
S. Park and B. G. Jang,
Optimal retirement strategy with a negative wealth constraint, Oper. Res. Lett., 42 (2014), 208-212.
doi: 10.1016/j.orl.2014.02.005. |
| [25] |
G. Peskir,
On the American option problem, Math. Finance, 15 (2005), 169-181.
doi: 10.1111/j.0960-1627.2005.00214.x. |
| [26] |
Z. Yang and H. Koo,
Optimal consumption and portfolio selection with early retirement options, Math. Oper. Res., 43 (2018), 1378-1404.
doi: 10.1287/moor.2017.0909. |
show all references
References:
| [1] |
M. Abramowitz and I. Stegun, Handbook of Mathematical Functions With Formulas, Graphs, and Mathematical Tables, National Bureau of Standards Applied Mathematics Series, 55, 1964. |
| [2] |
S. Ahn, K. J. Choi and B. H. Lim,
Optimal consumption and investment under time-varying liquidity constraints, J. Financial and Quantitative Anal., 54 (2019), 1643-1681.
doi: 10.1017/S0022109018001047. |
| [3] |
A. Bensoussan, B. G. Jang and S. Park,
Unemployment risks and optimal retirement in an incomplete market, Oper. Res., 64 (2016), 1015-1032.
doi: 10.1287/opre.2016.1503. |
| [4] |
K. Choi, K. Koo, B. H. Lim and J. Yoo, Limited commitment, business cycle, and portfolio selection, preprint. Available at SSRN: https://ssrn.com/abstract=2560607.
doi: 10.2139/ssrn.3230235. |
| [5] |
K. Choi, G. Shim and Y. Shin,
Optimal portfolio, consumption-leisure and retirement choice problem with CES utility, Math. Finance, 18 (2008), 445-472.
doi: 10.1111/j.1467-9965.2008.00341.x. |
| [6] |
J. F. Cocco, F. J. Gomes and P. J. Maenhout,
Consumption and portfolio choice over the life cycle, Review of Financial Studies, 18 (2005), 491-533.
doi: 10.1093/rfs/hhi017. |
| [7] |
J. Cox and C. Huang,
Optimal consumption and portfolio polices when asset prices follow a diffusion process, J. Econom. Theory, 49 (1989), 33-83.
doi: 10.1016/0022-0531(89)90067-7. |
| [8] |
P. Dybvig and H. Liu,
Lifetime consumption and investment: Retirement and constrained borrowing, J. Econom. Theory, 145 (2010), 885-907.
doi: 10.1016/j.jet.2009.08.003. |
| [9] |
P. Dybvig and C. Rogers, High hopes and disappointment, preprint. |
| [10] |
M. El Karoui and M. Jeanblanc-Picqué,
Optimization of consumption with labor income, Finance and Stochastics, 2 (1998), 409-440.
doi: 10.1007/s007800050048. |
| [11] |
E. Farhi and S. Panageas,
Saving and investing for early retirement: A theoretical analysis, J. Financial Econom., 83 (2007), 87-121.
|
| [12] |
A. Friedman,
Parabolic variational inequalities in one space dimension and smoothness of the free boundary, J. Functional Analysis, 18 (1975), 151-176.
doi: 10.1016/0022-1236(75)90022-1. |
| [13] |
A. Friedman, Variational Principles and Free-boundary Problems, Pure and Applied Mathematics, John Wiley & Sons, Inc., New York, 1982. |
| [14] |
J. Harrison, Brownian motion and stochastic flow systems, Wiley Series in Probability and Mathematical Statistics, John Wiley & Sons, Inc., New York, 1985. |
| [15] |
H. He and H. Pagés,
Labor income, borrowing constraints, and equilibrium asset prices, Econom. Theory, 3 (1993), 663-696.
doi: 10.1007/BF01210265. |
| [16] |
J. Z. Huang, M. G. Subrahmanyam and G. G. Yu,
Pricing and hedging American options: A recursive integration method, Review of Financial Studies, 9 (1996), 277-300.
doi: 10.1093/rfs/9.1.277. |
| [17] |
I. Karatzas, J. Lehoczky and S. Shreve,
Optimal portfolio and consumption decisions for a ``small investor" on a finite horizon, SIAM J. Control Optim., 25 (1987), 1557-1586.
doi: 10.1137/0325086. |
| [18] |
I. Karatzas and S. Shreve, Methods of Mathematical Finance, Applications of Mathematics, 39, Springer-Verlag, New York, 1998.
doi: 10.1007/b98840. |
| [19] |
H. Koo,
Consumption and portfolio selection with labor income: A continuous time approach, Math. Finance, 8 (1996), 49-65.
doi: 10.1111/1467-9965.00044. |
| [20] |
N. V. Krylov, Controlled Diffusion Processes, Applications of Mathematics, Springer-Verlag, New York, 1980. |
| [21] |
H. K. Liu,
Properties of American volatility options in the mean-reverting $3/2$ volatility model, SIAM J. Financial Math., 6 (2015), 53-65.
doi: 10.1137/130924573. |
| [22] |
R. Merton,
Lifetime portfolio selection under uncertainty: The continuous-time case, Review of Econom. and Statistics, 51 (1969), 247-257.
doi: 10.2307/1926560. |
| [23] |
R. Myneni,
The pricing of the American option, Ann. Appl. Probab., 2 (1992), 1-23.
doi: 10.1214/aoap/1177005768. |
| [24] |
S. Park and B. G. Jang,
Optimal retirement strategy with a negative wealth constraint, Oper. Res. Lett., 42 (2014), 208-212.
doi: 10.1016/j.orl.2014.02.005. |
| [25] |
G. Peskir,
On the American option problem, Math. Finance, 15 (2005), 169-181.
doi: 10.1111/j.0960-1627.2005.00214.x. |
| [26] |
Z. Yang and H. Koo,
Optimal consumption and portfolio selection with early retirement options, Math. Oper. Res., 43 (2018), 1378-1404.
doi: 10.1287/moor.2017.0909. |
Figure 2.
Simulated paths of wealth to income ratio $ X^{*}/I $ , portfolio to income ratio $ \pi^{*}/I $ , consumption to income ratio $ c^{*}/I $ , the process $ y^{*}D^{*} $ , and the process $ D^{*} $ . Parameter values are given by $ \mu = 0.05, \sigma = 0.2, r = 0.01, \beta = 0.05, \gamma = 2, \mu_{I} = 0.012, \sigma_{I} = 0.1, \nu = 0.3 \;\;\mbox{and}\; T = 30 $
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