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2013 | OriginalPaper | Chapter

10. Numerical Methods

Authors : Hansjoerg Albrecher, Andreas Binder, Volkmar Lautscham, Philipp Mayer

Published in: Introduction to Quantitative Methods for Financial Markets

Publisher: Springer Basel

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Abstract

Numerical techniques prove particularly useful when explicit solution formulas in a certain model cannot be derived even for simple derivatives (e.g. in the Black-Karasinski model) or when the to-be-priced financial instrument has a complex structure so that analytical methods fail (e.g. if multiple cancelation rights exist).

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Footnotes
1
Such a digital condition could be ‘the option value remains 0, once the underlying stock price exceeds a certain barrier’.
 
2
A detailed analysis of this aspect can be found in Zulehner [76].
 
3
Such non-structured grids could, for example, include triangular or tetrahedral grids, or grids that become finer in certain parts of the computational region.
 
4
It will be practical if W only takes non-zero values on a small interval (see Figure 10.7). In this case the first term on the right-hand side of the above equation disappears, while the second (integral) term has a correspondingly small integration domain.
 
5
In the Black-Scholes differential equation the term with the second derivative with respect to S is the diffusion term, which has smoothing properties. The term with the first derivative with respect to S is the so-called convection term. Heat transmission, for example, can occur by heat conduction (diffusion) or by the flow of fluids such as liquids or gases (convection). A central heating system in a house would be an example of convection. It is often challenging to treat convection numerically. The so-called upwind techniques or streamline diffusion techniques increase the stability of problems that show dominant convection. In the case of mean-reverting interest rate models, convection can be significant.
 
6
This is the case for most stock price models discussed here, in particular for the Heston and the Merton model.
 
7
This can be justified, as the integrand is absolutely integrable under the given assumption for α.
 
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Metadata
Title
Numerical Methods
Authors
Hansjoerg Albrecher
Andreas Binder
Volkmar Lautscham
Philipp Mayer
Copyright Year
2013
Publisher
Springer Basel
DOI
https://doi.org/10.1007/978-3-0348-0519-3_10