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Abstract and Applied Analysis
Volume 2014 (2014), Article ID 513496, 6 pages
European Option Pricing with Transaction Costs in Lévy Jump Environment
1School of Science, Donghua University, Shanghai 200051, China
2College of Electronic and Electrical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China
Received 25 January 2014; Accepted 20 February 2014; Published 27 March 2014
Academic Editor: Bo Shen
Copyright © 2014 Jiayin Li et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
The European option pricing problem with transaction costs is investigated for a risky asset price model with Lévy jump. By the aid of arbitrage pricing theory and the generalized Itô formula (which includes Poisson jump), the explicit solution to the risk asset price model is given. According to arbitrage-free principle, we first discretize the continuous-time model. Then, in each small time interval, the transaction costs are introduced. By using the -hedging strategy, the explicit solutions of the European options pricing formula with transaction costs are given for the risky asset price model with Lévy jump.
Recently, the stochastic differential equation theory has found more and more applications in many fields such as finance [1–12] and control and filtering [13–25]. The option pricing with transaction costs has been one of the important problems and received increasing research attention. The development of the option pricing problem is reviewed as follows. In , the hedge strategy has been introduced initially to solve the option pricing problem with transaction costs. In , the option pricing problem with transaction costs has been transformed into a stochastic optimal control issue. Subsequently, a perfect hedge strategy has been proposed in  to deal with CRR model with transaction costs and a discrete algorithm has been given. In , the transaction costs of European options have been proposed on the discrete time points for three scenarios, that is, without transaction costs, with proportional transaction costs and with concave transaction costs. By using the stochastic dominance theory, in , the upper/lower limit has been given for European call option with transaction costs as well as its corresponding volatility. In order to avoid solving a complicated stochastic optimization problem, in , an effective algorithm on Markov chain has been proposed to obtain the European option price. For the case of random volatility, a nonlinear differential equation has been constructed in  to price the European option with transaction costs. Some efforts have also been made on the American option pricing problems. For example, the American option pricing problem has been studied for the jump diffusion model with transaction costs in , where the problem addressed has first been transformed into a binary stochastic control problem and then solved numerically.
It should be pointed out that, in the frictional financial market, the models mentioned above have not taken the risks into account. For the pricing problem with transaction costs, we also need to consider the risk asset pricing model. Since the B-S  option pricing formula put forward, option pricing has been an important part of financial mathematics. As early as 1976, Merton  noticed that when some major message occurred, the risky asset price’s changing was discontinuous and pointed out that the risky asset was driven by a Brownian motion and a jump diffusion model. Aase  presented Itô process and random point process mixture model. Scott  built a jump-diffusion model with stochastic volatility and interest rate and gave the European option pricing formula. Chan’s  came up with Lévy process model and obtained the option pricing formula.
In this paper, the risk asset pricing model with Lévy jump diffusion is considered and, following Leland’s  idea, a more realistic pricing formula is given that has more practical potential.
2. Problem Formulation and Preliminaries
The B-S model has been proposed in  where the B-S model based European option pricing formula has been obtained. In , the Poisson jump diffusion process has been introduced to represent the stock price process, and the corresponding European option pricing formula has been derived. In this paper, we will investigate the European option pricing problem for the Merton’s model.
The following assumption is needed.
Assumption 1. Suppose that the following conditions are satisfied:(i)risk-free rate is a constant;(ii)there is no dividend;(iii)there are no transaction costs;(iv)there is no arbitrage opportunity.
Consider the following asset model : where is the price of risky asset; suppose has a jump at time , and then is the size of this jump, which is also ; represents the rate of return; denotes the volatility; is a standard Brownian motion; is a Poisson measure with its intensity .
From (1), we further have where is risk-free rate.
We introduce the following lemmas that will be used to obtain the main results.
Lemma 2 (see ). Let be a Lévy-Itô integration described as follows:
where is a compensated Poisson measure and the continuous part of process satisfies
Then, for any , , is also a Lévy-Itô integration and satisfies
Set with probability, and denote where , , are Poisson processes with respective intensities , and represents the independent and identically distributed random variables taking values in the set .
Defining , we have the following lemma.
Lemma 4. One has , the call option’s final value condition is . Then, with the help of Lemma 2.3.4 in , one has where is the call option price given by with .
In an unstable financial market, investors use some financial instruments to hedge risks and price its value. The basic idea is to construct a portfolio to hedge risks. Similarly, -hedge can also be used in the process of pricing option. We take the risky asset price model following the geometric Brownian motion, for example, and describe the -hedge idea about the derivation of option pricing formula.
Assume that the asset price model is given by
Suppose that there is no arbitrage opportunity. We construct a portfolio , where is the shares of risky asset. Note that, in the interval , is not risky and the is not changeable. Hence, the return rate of portfolio can be given by
Then, we have
On the other hand, by using Itô formula, it can be obtained that
Substituting (14) into (13) yields Since there is no risk, the coefficient of the random term in (15) should be zero; that is, and hence (15) becomes Finally, according to the condition of the final value , we can obtain the call option pricing formula where .
3. Main Results
As an earlier derivation of option pricing is implemented under some “idealised” conditions, its applications are limited. In order to loosen these restrictions, the transaction costs are introduced in the derivation of option pricing. For example, the hedging strategy has been considered in  when transaction costs occur at discrete time points, and the explicit formula of the call option price with transaction costs has been put forward. In , the European option pricing problem with the transaction costs has been studied for the jump diffusion model. In this section, we aim to give the European option pricing formula with transaction costs for the Lévy jump case.
In the interval with a sufficiently small , the profit is given by where is the transaction cost ratio and is the number of risky asset changing. Hence, it is easily known that the transaction costs are .
Our main results are given as follows.
Theorem 5. For the risky asset price model (1), satisfies
Proof. By using Taylor’s formula, it follows from (16) that Then, we have According to no arbitrage principle and Lemma 2, we have Note that which implies Therefore, we have the following equation: This completes the proof.
From Theorem 5, the following theorem is obtained.
Theorem 6. For , the call option price with transaction costs satisfies where
Remark 7. In , the standard geometric Brownian motion model has been considered and the European option pricing formula with transaction costs has been obtained through the -hedge. The call option price given in  satisfies where and are the same as and defined in Theorem 6, but is different from in this paper. In terms of comparison of the call option price formula given in this paper and , it can be seen that the results derived in this paper extend the ones in  and our results are more practically useful.
In this paper, the European option pricing problem with transaction costs has been studied. In order to make the pricing more practical, we have chosen the Lévy jump diffusion model instead of the standard geometric Brownian motion model. By using the -hedged strategy, the explicit call option pricing formula has been obtained for the Lévy jump case. Our results have extended the ones in the existing literature.
Conflict of Interests
The authors declare that there is no conflict of interests regarding the publication of this paper.
This work was supported in part by the National Natural Science Foundation of China under Grant 60974030, the Shanghai Rising-Star Program of China under Grant 13QA1400100, and the Fundamental Research Funds for the Central Universities of China.
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