Abstract
In this paper, we consider generalized Asian options and propose a unified approximation method for the pricing of such options when the underlying process is a diffusion. Through numerical examples, we show that our approximation method is accurate enough to be used in practice for the pricing of any type of Asian options that has been treated separately in the literature. Comparisons are made with the existing methods in the literature to support the usefulness of our method.
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Notes
See, e.g., Fusai et al. (2008) for the usage of Asian options in the actual markets.
For an extensive literature review, we refer to Cai and Kou (2012).
An extension to the stochastic volatility case is straightforward by using the method given in Funahashi (2014) and omitted.
If a dividend rate d is considered, we simply replace r by \(r-d\) and the same arguments can apply.
The Hermite polynomials are defined by \(h_{n}(x) = (-1)^{n} \mathrm{e}^{x^2/2} \frac{\mathrm{d}^{n}}{\mathrm{d}x^{n}} \mathrm{e}^{-x^2/2}\), \(n=1,2, \dots \), with \(h_0(x)=1\). For example, we have \(h_{1}(x)=x\), \(h_{2}(x)=x^{2} - 1\), \(h_{3}(x)=x^{3} - 3x\), etc.
Throughout this paper, the benchmark values are computed by MC simulations with 300,000 trials and 20,000 time steps for all the cases.
The PDFs of the averages are more concentrated and becomes more symmetric around the mean compared with the stock price \(S_T\).
As shown in Cai and Kou (2012), the double Laplace inversion method agrees with the eigenfunction expansion method to ten decimal points.
In practice, daily-sampled Asian options are most frequently traded. For one-year maturity options, the number of sampling is given by \(N=250\).
The case \(\eta =1\) corresponds to the GBM case, i.e. the Black–Scholes setting.
References
Black, F., & Scholes, M. (1973). The pricing of options and corporate liabilities. Journal of Political Economy, 81, 637–654.
Cai, N., & Kou, S. (2012). Pricing Asian options under a hyper-exponential jump diffusion model. Operations Research, 60, 64–77.
Cai, N., Li, C., & Shi, C. (2014). Closed-form expansions of discretely monitored Asian options in diffusion models. Mathematics of Operations Research, 39, 789–822.
Chang, C. C., & Tsao, C. Y. (2011). Efficient and accurate quadratic approximation methods for pricing Asian strike options. Quantitative Finance, 11, 729–748.
Dewynne, J. N., & Shaw, W. T. (2008). Differential equations and asymptotic solutions for arithmetic Asian options: Black-Scholes formulae for Asian rate calls. European Journal of Applied Mathematics, 19, 353–391.
Dewynne, J. N., & Wilmott, P. (1993). Partial to the exotic. Risk, 6, 38–46.
Dufresne, D. (2000). Laguerre series for Asian and other options. Mathematical Finance, 10, 407–428.
Eberlein, E., Papapantoleon, A., & Shiryaev, A. N. (2008). On the duality principle in option pricing: semimartingale setting. Finance and Stochastics, 12, 265–292.
Fouque, J. P., & Han, C. H. (2003). Pricing Asian options with stochastic volatility. Quantitative Finance, 3, 352–362.
Funahashi, H. (2014). A chaos expansion approach under hybrid volatiltiy models. Quantitative Finance, 14, 1923–1936.
Funahashi, H., & Kijima, M. (2014). An extension of the chaos expansion approximation for the pricing of exotic basket options. Applied Mathematical Finance, 21, 109–139.
Funahashi, H., & Kijima, M. (2015). A chaos expansion approach for the pricing of contingent claims. Journal of Computational Finance, 18, 27–58.
Fusai, G., Marena, M., & Roncoroni, A. (2008). Analytical pricing of discretely monitored Asian-style options: Theory and application to commodity markets. Journal of Banking and Finance, 32, 2033–2045.
Henderson, V., Hobson, D., Shaw, W., & Wojakowski, R. (2007). Bounds for in-progress floating-strike Asian options using symmetry. Annals of Operations Research, 151, 81–98.
Henderson, V., & Wojakowski, R. (2002). On the equivalence of floating- and fixed-strike Asian options. Journal of Applied Probability, 39, 391–394.
Ju, N. (2002). Pricing Asian and basket options via Taylor expansion. Journal of Computational Finance, 5, 79–103.
Kemna, A. G. Z., & Vorst, A. C. F. (1990). A pricing method for options based on average asset values. Journal of Banking and Finance, 14, 113–129.
Lapeyre, B., & Temam, E. (2001). Competitive Monte Carlo methods for pricing Asian options. Journal of Computational Finance, 5, 39–57.
Linetsky, V. (2004). Spectral expansions for Asian (average price) options. Operations Research, 52, 856–867.
Moreno, M., & J.F. Navas (2002). Australian Asian options. IE Working Paper, Instituto de Empresa, Spain.
Shiraya, K., & Takahashi, A. (2011). A moment matching approach to the valuation of a volume weighted average price option. Journal of Futures Market, 10, 407–439.
Takahashi, A. (1999). An asymptotic expansion approach to pricing financial contingent claims. Asia-Pacific Financial Market, 6, 115–151.
Takahashi, A., & Takehara, K. (2007). Pricing currency options with a market model of interest rates under jump-diffusion stochastic volatility processes of spot exchange rates. Asia-Pacific Financial Market, 14, 69–121.
Vecer, J. (2001). A new PDE approach for pricing arithmetic average Asian options. Journal of Computational Finance, 4, 105–113.
Vecer, J., & Xu, M. (2004). Pricing Asian options in a semimartingale model. Quantitative Finance, 4, 170–175.
Zhang, J. (2000). Arithmetic Asian options with continuous sampling. Journal of Computational Finance, 2, 59–79.
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Appendices
Appendix 1: Explicit formulas of deterministic functions
For the local volatility function \(\sigma (t, S)\) given in (3.2), we define \(\sigma _0(t) =\sigma (t, F(0,t))\), \(\sigma _1(t) =\sigma _S(t, F(0,t))\), and \(\sigma _2(t) =\sigma _{SS}(t, F(0,t))\) for the sake of notational simplicity, where \(\sigma _{S}(t, S)\) and \(\sigma _{SS}(t, S)\) denote the first-order and second-order derivatives of \(\sigma (t, S)\) with respect to the price S, respectively. Then, according to Funahashi and Kijima (2015), the risky asset price \(S_t\) can be approximated by (3.3). The deterministic functions \(f_1(t)\), \(g_i(t)\), and \(h_{kj}(t)\) involved there are given as follows:
Next, suppose that \(X_t\) is expanded as in (4.3). Then, the functions \(q_i(t)\) involved in Lemma 4.1 (Theorem 4.1 as well) are given as follows:
Appendix 2: Proof of Lemma 4.1
Recall that \(X_T\) in (4.3) is given as
where
and
The key point in this proof is that \(c_{1t}\) is a Wiener integral with deterministic integrand \({{\hat{f}}}_1(s,t)\), which is normally distributed with zero mean and variance \(V_T = \int _0^t {{\hat{f}}}_1^2(s,t) \mathrm{d}s\), the random variable \(c_{2t}\) is a second-order iterated stochastic integral with deterministic integrands, and the term \(c_{3t}\) is a sum of third-order iterated stochastic integrals with deterministic integrands. For such a case, we can apply the discussions given in Funahashi and Kijima (2015).
Let the characteristic function of \(X_T\) be \(\Psi (\xi ) = \mathbb {E}[ \mathrm{e}^{i \xi X_T} ] \) and expand it as
where \(R_4\) consists of the forth or higher-order multiple stochastic integrals. According to Funahashi and Kijima (2015), the term \(\mathbb {E}\left[ \mathrm{e}^{ i \xi c_{1T} } R_4 \right] \) can be regarded as zero and we obtain the following approximation:
Taking the conditional expectation on \(c_{1T}\), we then obtain
as an approximation of the characteristic function \(\Psi (\xi )\).
The conditional expectations involved in (7.1) can be evaluated explicitly by applying the formulas in Appendix C of Funahashi and Kijima (2014). Namely, we have
where the functions \(q_i(t)\), \(i=1,\dots ,5\), are given in Appendix 1.
Let us denote the density function of \(X_T\) by \(f_{X_T}(x)\). Then, from the following inversion formula, we can find an approximation of \(f_{X_T}(x)\) from the approximated characteristic function. The next inversion formula is well known. See, e.g., Funahashi and Kijima (2015).
Lemma 7.1
Suppose that X follows a normal distribution with zero mean and variance \(\Sigma \). Then, for any polynomial functions f(x) and g(x), we have
where n(x; a, b) denotes the normal density function with mean a and variance b.
Now, by applying Lemma 7.1 to each term in the right-hand side of (7.1), we obtain the approximation of the density function as
Finally, by substituting (7.2)–(7.4) into (7.5), we obtain the desired result.
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Funahashi, H., Kijima, M. A unified approach for the pricing of options relating to averages. Rev Deriv Res 20, 203–229 (2017). https://doi.org/10.1007/s11147-017-9128-4
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DOI: https://doi.org/10.1007/s11147-017-9128-4
Keywords
- Generalized Asian option
- Floating strike
- Fixed strike
- Discretely sampled
- Continuously sampled
- Forward-starting
- In-progress
- Australian-Asian option