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84
Option Pricing by Transform Methods: Extensions, Unification, and Error Control
 Journal of Computational Finance
"... We extend and unify Fourieranalytic methods for pricing a wide class of options on any underlying state variable whose characteristic function is known. In this general setting, we bound the numerical pricing error of discretized transform computations, such as DFT/FFT. These bounds enable algorith ..."
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Cited by 89 (6 self)
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We extend and unify Fourieranalytic methods for pricing a wide class of options on any underlying state variable whose characteristic function is known. In this general setting, we bound the numerical pricing error of discretized transform computations, such as DFT/FFT. These bounds enable algorithms to select efficient quadrature parameters and to price with guaranteed numerical accuracy.
Moment explosions in stochastic volatility models
 FINANCE STOCH (2007) 11:29–50
, 2007
"... In this paper, we demonstrate that many stochastic volatility models have the undesirable property that moments of order higher than 1 can become infinite in finite time. As arbitragefree price computation for a number of important fixed income products involves forming expectations of functions ..."
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Cited by 81 (0 self)
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In this paper, we demonstrate that many stochastic volatility models have the undesirable property that moments of order higher than 1 can become infinite in finite time. As arbitragefree price computation for a number of important fixed income products involves forming expectations of functions with superlinear growth, such lack of moment stability is of significant practical importance. For instance, we demonstrate that reasonably parametrized models can produce infinite prices for Eurodollar futures and for swaps with floating legs paying either Liborinarrears or a constant maturity swap rate.We systematically examine the moment explosion property across a spectrum of stochastic volatility models. We show that lognormal and displaceddiffusion type models are easily prone to moment explosions, whereas CEVtype models (including the socalled SABR model) are not. Related properties such as the failure of the martingale property are also considered.
Arbitragefree smoothing of the implied volatility surface
, 2005
"... The pricing accuracy and pricing performance of local volatility models crucially depends on absence of arbitrage in the implied volatility surface: an input implied volatility surface that is not arbitragefree invariably results in negative transition probabilities and / or negative local volatil ..."
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Cited by 29 (1 self)
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The pricing accuracy and pricing performance of local volatility models crucially depends on absence of arbitrage in the implied volatility surface: an input implied volatility surface that is not arbitragefree invariably results in negative transition probabilities and / or negative local volatilities, and ultimately, into mispricings. The common smoothing algorithms of the implied volatility surface cannot guarantee the absence arbitrage. Here, we propose an approach for smoothing the implied volatility smile in an arbitragefree way. Our methodology is simple to implement, computationally cheap and builds on the wellfounded theory of natural smoothing splines under suitable shape constraints. Unlike other methods, our approach also works when input data are scarce and not arbitragefree. Thus, it can easily be integrated into standard local volatility pricers.
Moment explosions and longterm behavior of affine stochastic volatility models
, 2010
"... Abstract. We consider a class of asset pricing models, where the riskneutral joint process of logprice and its stochastic variance is an affine process in the sense of Duffie, Filipovic, and Schachermayer [2003]. First we obtain conditions for the price process to be conservative and a martingale. ..."
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Cited by 26 (7 self)
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Abstract. We consider a class of asset pricing models, where the riskneutral joint process of logprice and its stochastic variance is an affine process in the sense of Duffie, Filipovic, and Schachermayer [2003]. First we obtain conditions for the price process to be conservative and a martingale. Then we present some results on the longterm behavior of the model, including an expression for the invariant distribution of the stochastic variance process. We study moment explosions of the price process, and provide explicit expressions for the time at which a moment of given order becomes infinite. We discuss applications of these results, in particular to the asymptotics of the implied volatility smile, and conclude with some calculations for the Heston model, a model of Bates and the BarndorffNielsenShephard model. 1.
2006a): Regular Variation and Smile Asymptotics
"... We consider riskneutral returns and show how their tail asymptotics translate directly to asymptotics of the implied volatility smile, thereby sharpening Roger Lee’s celebrated moment formula. The theory of regular variation provides the ideal mathematical framework to formulate and prove such resu ..."
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Cited by 22 (0 self)
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We consider riskneutral returns and show how their tail asymptotics translate directly to asymptotics of the implied volatility smile, thereby sharpening Roger Lee’s celebrated moment formula. The theory of regular variation provides the ideal mathematical framework to formulate and prove such results. The practical value of our formulae comes from the vast literature on tail asymptotics and our conditions are often seen to be true by simple inspection of known results. 1
Optimal Fourier Inversion in Semianalytical Option Pricing
"... Fourier inversion is the computational method of choice for a fast and accurate calculation of plain vanilla option prices in models with an analytically available characteristic function. Shifting the contour of integration along the complex plane allows for different representations of the inverse ..."
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Cited by 21 (7 self)
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Fourier inversion is the computational method of choice for a fast and accurate calculation of plain vanilla option prices in models with an analytically available characteristic function. Shifting the contour of integration along the complex plane allows for different representations of the inverse Fourier integral. In this article, we present the optimal contour of the Fourier integral, taking into account numerical issues such as cancellation and explosion of the characteristic function. This allows for robust and fast option pricing for virtually all levels of strikes and maturities. 1
Putcall symmetry: extensions and applications
 Math. Finance
"... Classic putcall symmetry relates the prices of puts and calls at strikes on opposite sides of the forward price. We extend putcall symmetry in several directions. Relaxing the assumptions, we generalize to unified local/stochastic volatility models and timechanged Lévy processes, under a symmetry ..."
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Cited by 20 (3 self)
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Classic putcall symmetry relates the prices of puts and calls at strikes on opposite sides of the forward price. We extend putcall symmetry in several directions. Relaxing the assumptions, we generalize to unified local/stochastic volatility models and timechanged Lévy processes, under a symmetry condition. Further relaxing the assumptions, we generalize to various asymmetric dynamics. Extending the conclusions, we take an arbitrarily given payoff of European style or single/double/sequential barrier style, and we construct a conjugate Europeanstyle claim of equal value, and thereby a semistatic hedge of the given payoff.
Asymptotic formulas with error estimates for call pricing functions and the implied volatility at extreme strikes
, 2009
"... In this paper, we obtain asymptotic formulas with error estimates for the implied volatility associated with a European call pricing function. We show that these formulas imply Lee’s moment formulas for the implied volatility and the tailwing formulas due to Benaim and Friz. In addition, we analyze ..."
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Cited by 20 (5 self)
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In this paper, we obtain asymptotic formulas with error estimates for the implied volatility associated with a European call pricing function. We show that these formulas imply Lee’s moment formulas for the implied volatility and the tailwing formulas due to Benaim and Friz. In addition, we analyze Paretotype tails of stock price distributions in uncorrelated HullWhite, SteinStein, and Heston models and find asymptotic formulas with error estimates for call pricing functions in these models.
Affine Diffusion Processes: Theory and Applications
 In Advanced Financial Modelling
, 2009
"... We revisit affine diffusion processes on general and on the canonical state space in particular. A detailed study of theoretic and applied aspects of this class of Markov processes is given. In particular, we derive admissibility conditions and provide a full proof of existence and uniqueness throug ..."
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Cited by 18 (6 self)
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We revisit affine diffusion processes on general and on the canonical state space in particular. A detailed study of theoretic and applied aspects of this class of Markov processes is given. In particular, we derive admissibility conditions and provide a full proof of existence and uniqueness through stochastic invariance of the canonical state space. Existence of exponential moments and the full range of validity of the affine transform formula are established. This is applied to the pricing of bond and stock options, which is illustrated for the Vasiček, Cox–Ingersoll–Ross and Heston models. 1