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Published in: Finance and Stochastics 3/2020

18-05-2020

Conditional Davis pricing

Authors: Kasper Larsen, Halil Mete Soner, Gordan Žitković

Published in: Finance and Stochastics | Issue 3/2020

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Abstract

We study the set of Davis (marginal utility-based) prices of a financial derivative in the case where the investor has a non-replicable random endowment. We give a new characterisation of the set of all such prices, and provide an example showing that even in the simplest of settings – such as Samuelson’s geometric Brownian motion model –, the interval of Davis prices is often a non-degenerate subinterval of the set of all no-arbitrage prices. This is in stark contrast to the case with a constant or replicable endowment where non-uniqueness of Davis prices is exceptional. We provide formulas for the endpoints of these intervals and illustrate the theory with several examples.

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Appendix
Available only for authorised users
Footnotes
1
The theory of Davis pricing is simpler for utility functions, such as the exponential utility, defined on ℝ. For example, in any such model, Davis prices are unique because Bellini and Frittelli [2] have shown that the dual utility minimiser is a countably additive probability measure.
 
2
It has been shown in Larsen and Žitković [29, Lemma 3.12] that under the reasonable elasticity condition, infimisation over the set of countably additive martingale measures – as opposed to its finitely additive enlargement as in Cvitanić et al. [7] – leads to the same value function.
 
3
We thank our AE and a referee for this suggestion.
 
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Metadata
Title
Conditional Davis pricing
Authors
Kasper Larsen
Halil Mete Soner
Gordan Žitković
Publication date
18-05-2020
Publisher
Springer Berlin Heidelberg
Published in
Finance and Stochastics / Issue 3/2020
Print ISSN: 0949-2984
Electronic ISSN: 1432-1122
DOI
https://doi.org/10.1007/s00780-020-00424-5

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