Suppose that the intensity of the Poisson process (N) is equal to 1 and let (d L_{t}=L_{t^{-}}

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Suppose that the intensity of the Poisson process \(N\) is equal to 1 and let \(d L_{t}=L_{t^{-}} \gamma_{t} d M_{t}, L_{0}=1\) where \(\gamma\) is a non-deterministic \(\mathbf{F}^{W}\)-predictable process. Denote by \(\mathbb{Q}^{\gamma}\) the probability \(\left.\mathbb{Q}^{\gamma}\right|_{\mathcal{F}_{t}}=\left.L_{t} \mathbb{P}\right|_{\mathcal{F}_{t}}\). The filtration of \(M^{\gamma}\) is that of both \(M\) and \(\int_{0}^{t} \gamma_{s} d s\), hence, the processes \(W\) and \(M^{\gamma}\) are not independent.

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Mathematical Methods For Financial Markets

ISBN: 9781447125242

1st Edition

Authors: Monique Jeanblanc, Marc Yor, Marc Chesney

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